From ae9deed222856e89d48092b9f75d0780fa191a05 Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Thu, 13 Jan 2022 15:17:40 +0530
Subject: [PATCH 01/30] test: add an e2e test verifying that semi sync is setup
 correctly after calling a reparent operation

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 .../reparent/emergencyreparent/ers_test.go    | 66 +++++++++++++++++--
 .../reparent/newfeaturetest/reparent_test.go  |  8 +--
 .../reparent/plannedreparent/reparent_test.go | 22 +++----
 go/test/endtoend/reparent/utils/utils.go      | 18 +++--
 4 files changed, 90 insertions(+), 24 deletions(-)

diff --git a/go/test/endtoend/reparent/emergencyreparent/ers_test.go b/go/test/endtoend/reparent/emergencyreparent/ers_test.go
index b99cd3ef25c..fb529189c91 100644
--- a/go/test/endtoend/reparent/emergencyreparent/ers_test.go
+++ b/go/test/endtoend/reparent/emergencyreparent/ers_test.go
@@ -30,7 +30,7 @@ import (
 
 func TestTrivialERS(t *testing.T) {
 	defer cluster.PanicHandler(t)
-	clusterInstance := utils.SetupReparentCluster(t)
+	clusterInstance := utils.SetupReparentCluster(t, true)
 	defer utils.TeardownCluster(clusterInstance)
 	tablets := clusterInstance.Keyspaces[0].Shards[0].Vttablets
 
@@ -55,7 +55,7 @@ func TestTrivialERS(t *testing.T) {
 
 func TestReparentIgnoreReplicas(t *testing.T) {
 	defer cluster.PanicHandler(t)
-	clusterInstance := utils.SetupReparentCluster(t)
+	clusterInstance := utils.SetupReparentCluster(t, true)
 	defer utils.TeardownCluster(clusterInstance)
 	tablets := clusterInstance.Keyspaces[0].Shards[0].Vttablets
 	var err error
@@ -97,7 +97,7 @@ func TestReparentIgnoreReplicas(t *testing.T) {
 
 func TestReparentDownPrimary(t *testing.T) {
 	defer cluster.PanicHandler(t)
-	clusterInstance := utils.SetupReparentCluster(t)
+	clusterInstance := utils.SetupReparentCluster(t, true)
 	defer utils.TeardownCluster(clusterInstance)
 	tablets := clusterInstance.Keyspaces[0].Shards[0].Vttablets
 
@@ -133,7 +133,7 @@ func TestReparentDownPrimary(t *testing.T) {
 
 func TestReparentNoChoiceDownPrimary(t *testing.T) {
 	defer cluster.PanicHandler(t)
-	clusterInstance := utils.SetupReparentCluster(t)
+	clusterInstance := utils.SetupReparentCluster(t, true)
 	defer utils.TeardownCluster(clusterInstance)
 	tablets := clusterInstance.Keyspaces[0].Shards[0].Vttablets
 	var err error
@@ -165,3 +165,61 @@ func TestReparentNoChoiceDownPrimary(t *testing.T) {
 	// bring back the old primary as a replica, check that it catches up
 	utils.ResurrectTablet(ctx, t, clusterInstance, tablets[0])
 }
+
+func TestSemiSyncSetupCorrectly(t *testing.T) {
+	t.Run("semi-sync enabled", func(t *testing.T) {
+		defer cluster.PanicHandler(t)
+		clusterInstance := utils.SetupReparentCluster(t, true)
+		defer utils.TeardownCluster(clusterInstance)
+		tablets := clusterInstance.Keyspaces[0].Shards[0].Vttablets
+
+		utils.ConfirmReplication(t, tablets[0], []*cluster.Vttablet{tablets[1], tablets[2], tablets[3]})
+		// Run forced reparent operation, this should proceed unimpeded.
+		out, err := utils.Ers(clusterInstance, tablets[1], "60s", "30s")
+		require.NoError(t, err, out)
+
+		utils.ConfirmReplication(t, tablets[1], []*cluster.Vttablet{tablets[0], tablets[2], tablets[3]})
+
+		for _, tablet := range tablets {
+			utils.CheckSemiSyncSetupCorrectly(t, tablet, "ON")
+		}
+
+		// Run forced reparent operation, this should proceed unimpeded.
+		out, err = utils.Prs(t, clusterInstance, tablets[0])
+		require.NoError(t, err, out)
+
+		utils.ConfirmReplication(t, tablets[0], []*cluster.Vttablet{tablets[1], tablets[2], tablets[3]})
+
+		for _, tablet := range tablets {
+			utils.CheckSemiSyncSetupCorrectly(t, tablet, "ON")
+		}
+	})
+
+	t.Run("semi-sync disabled", func(t *testing.T) {
+		defer cluster.PanicHandler(t)
+		clusterInstance := utils.SetupReparentCluster(t, false)
+		defer utils.TeardownCluster(clusterInstance)
+		tablets := clusterInstance.Keyspaces[0].Shards[0].Vttablets
+
+		utils.ConfirmReplication(t, tablets[0], []*cluster.Vttablet{tablets[1], tablets[2], tablets[3]})
+		// Run forced reparent operation, this should proceed unimpeded.
+		out, err := utils.Ers(clusterInstance, tablets[1], "60s", "30s")
+		require.NoError(t, err, out)
+
+		utils.ConfirmReplication(t, tablets[1], []*cluster.Vttablet{tablets[0], tablets[2], tablets[3]})
+
+		for _, tablet := range tablets {
+			utils.CheckSemiSyncSetupCorrectly(t, tablet, "OFF")
+		}
+
+		// Run forced reparent operation, this should proceed unimpeded.
+		out, err = utils.Prs(t, clusterInstance, tablets[0])
+		require.NoError(t, err, out)
+
+		utils.ConfirmReplication(t, tablets[0], []*cluster.Vttablet{tablets[1], tablets[2], tablets[3]})
+
+		for _, tablet := range tablets {
+			utils.CheckSemiSyncSetupCorrectly(t, tablet, "OFF")
+		}
+	})
+}
diff --git a/go/test/endtoend/reparent/newfeaturetest/reparent_test.go b/go/test/endtoend/reparent/newfeaturetest/reparent_test.go
index df7212d35f4..c67f0355e64 100644
--- a/go/test/endtoend/reparent/newfeaturetest/reparent_test.go
+++ b/go/test/endtoend/reparent/newfeaturetest/reparent_test.go
@@ -107,7 +107,7 @@ func TestPRSForInitialization(t *testing.T) {
 // TestERSPromoteRdonly tests that we never end up promoting a rdonly instance as the primary
 func TestERSPromoteRdonly(t *testing.T) {
 	defer cluster.PanicHandler(t)
-	clusterInstance := utils.SetupReparentCluster(t)
+	clusterInstance := utils.SetupReparentCluster(t, true)
 	defer utils.TeardownCluster(clusterInstance)
 	tablets := clusterInstance.Keyspaces[0].Shards[0].Vttablets
 	var err error
@@ -135,7 +135,7 @@ func TestERSPromoteRdonly(t *testing.T) {
 // TestERSPreventCrossCellPromotion tests that we promote a replica in the same cell as the previous primary if prevent cross cell promotion flag is set
 func TestERSPreventCrossCellPromotion(t *testing.T) {
 	defer cluster.PanicHandler(t)
-	clusterInstance := utils.SetupReparentCluster(t)
+	clusterInstance := utils.SetupReparentCluster(t, true)
 	defer utils.TeardownCluster(clusterInstance)
 	tablets := clusterInstance.Keyspaces[0].Shards[0].Vttablets
 	var err error
@@ -158,7 +158,7 @@ func TestERSPreventCrossCellPromotion(t *testing.T) {
 // caught up to it by pulling transactions from it
 func TestPullFromRdonly(t *testing.T) {
 	defer cluster.PanicHandler(t)
-	clusterInstance := utils.SetupReparentCluster(t)
+	clusterInstance := utils.SetupReparentCluster(t, true)
 	defer utils.TeardownCluster(clusterInstance)
 	tablets := clusterInstance.Keyspaces[0].Shards[0].Vttablets
 	var err error
@@ -222,7 +222,7 @@ func TestPullFromRdonly(t *testing.T) {
 // two replicas which do not have any replication status
 func TestTwoReplicasNoReplicationStatus(t *testing.T) {
 	defer cluster.PanicHandler(t)
-	clusterInstance := utils.SetupReparentCluster(t)
+	clusterInstance := utils.SetupReparentCluster(t, true)
 	defer utils.TeardownCluster(clusterInstance)
 	tablets := clusterInstance.Keyspaces[0].Shards[0].Vttablets
 	utils.ConfirmReplication(t, tablets[0], []*cluster.Vttablet{tablets[1], tablets[2], tablets[3]})
diff --git a/go/test/endtoend/reparent/plannedreparent/reparent_test.go b/go/test/endtoend/reparent/plannedreparent/reparent_test.go
index c6800d66507..99eda2cac10 100644
--- a/go/test/endtoend/reparent/plannedreparent/reparent_test.go
+++ b/go/test/endtoend/reparent/plannedreparent/reparent_test.go
@@ -33,7 +33,7 @@ import (
 
 func TestPrimaryToSpareStateChangeImpossible(t *testing.T) {
 	defer cluster.PanicHandler(t)
-	clusterInstance := utils.SetupReparentCluster(t)
+	clusterInstance := utils.SetupReparentCluster(t, true)
 	defer utils.TeardownCluster(clusterInstance)
 	tablets := clusterInstance.Keyspaces[0].Shards[0].Vttablets
 
@@ -45,7 +45,7 @@ func TestPrimaryToSpareStateChangeImpossible(t *testing.T) {
 
 func TestReparentCrossCell(t *testing.T) {
 	defer cluster.PanicHandler(t)
-	clusterInstance := utils.SetupReparentCluster(t)
+	clusterInstance := utils.SetupReparentCluster(t, true)
 	defer utils.TeardownCluster(clusterInstance)
 	tablets := clusterInstance.Keyspaces[0].Shards[0].Vttablets
 
@@ -59,7 +59,7 @@ func TestReparentCrossCell(t *testing.T) {
 
 func TestReparentGraceful(t *testing.T) {
 	defer cluster.PanicHandler(t)
-	clusterInstance := utils.SetupReparentCluster(t)
+	clusterInstance := utils.SetupReparentCluster(t, true)
 	defer utils.TeardownCluster(clusterInstance)
 	tablets := clusterInstance.Keyspaces[0].Shards[0].Vttablets
 
@@ -84,7 +84,7 @@ func TestReparentGraceful(t *testing.T) {
 // TestPRSWithDrainedLaggingTablet tests that PRS succeeds even if we have a lagging drained tablet
 func TestPRSWithDrainedLaggingTablet(t *testing.T) {
 	defer cluster.PanicHandler(t)
-	clusterInstance := utils.SetupReparentCluster(t)
+	clusterInstance := utils.SetupReparentCluster(t, true)
 	defer utils.TeardownCluster(clusterInstance)
 	tablets := clusterInstance.Keyspaces[0].Shards[0].Vttablets
 
@@ -111,7 +111,7 @@ func TestPRSWithDrainedLaggingTablet(t *testing.T) {
 
 func TestReparentReplicaOffline(t *testing.T) {
 	defer cluster.PanicHandler(t)
-	clusterInstance := utils.SetupReparentCluster(t)
+	clusterInstance := utils.SetupReparentCluster(t, true)
 	defer utils.TeardownCluster(clusterInstance)
 	tablets := clusterInstance.Keyspaces[0].Shards[0].Vttablets
 
@@ -128,7 +128,7 @@ func TestReparentReplicaOffline(t *testing.T) {
 
 func TestReparentAvoid(t *testing.T) {
 	defer cluster.PanicHandler(t)
-	clusterInstance := utils.SetupReparentCluster(t)
+	clusterInstance := utils.SetupReparentCluster(t, true)
 	defer utils.TeardownCluster(clusterInstance)
 	tablets := clusterInstance.Keyspaces[0].Shards[0].Vttablets
 	utils.DeleteTablet(t, clusterInstance, tablets[2])
@@ -160,14 +160,14 @@ func TestReparentAvoid(t *testing.T) {
 
 func TestReparentFromOutside(t *testing.T) {
 	defer cluster.PanicHandler(t)
-	clusterInstance := utils.SetupReparentCluster(t)
+	clusterInstance := utils.SetupReparentCluster(t, true)
 	defer utils.TeardownCluster(clusterInstance)
 	reparentFromOutside(t, clusterInstance, false)
 }
 
 func TestReparentFromOutsideWithNoPrimary(t *testing.T) {
 	defer cluster.PanicHandler(t)
-	clusterInstance := utils.SetupReparentCluster(t)
+	clusterInstance := utils.SetupReparentCluster(t, true)
 	defer utils.TeardownCluster(clusterInstance)
 	tablets := clusterInstance.Keyspaces[0].Shards[0].Vttablets
 
@@ -256,7 +256,7 @@ func reparentFromOutside(t *testing.T, clusterInstance *cluster.LocalProcessClus
 
 func TestReparentWithDownReplica(t *testing.T) {
 	defer cluster.PanicHandler(t)
-	clusterInstance := utils.SetupReparentCluster(t)
+	clusterInstance := utils.SetupReparentCluster(t, true)
 	defer utils.TeardownCluster(clusterInstance)
 	tablets := clusterInstance.Keyspaces[0].Shards[0].Vttablets
 
@@ -294,7 +294,7 @@ func TestReparentWithDownReplica(t *testing.T) {
 
 func TestChangeTypeSemiSync(t *testing.T) {
 	defer cluster.PanicHandler(t)
-	clusterInstance := utils.SetupReparentCluster(t)
+	clusterInstance := utils.SetupReparentCluster(t, true)
 	defer utils.TeardownCluster(clusterInstance)
 	tablets := clusterInstance.Keyspaces[0].Shards[0].Vttablets
 
@@ -358,7 +358,7 @@ func TestChangeTypeSemiSync(t *testing.T) {
 
 func TestReparentDoesntHangIfPrimaryFails(t *testing.T) {
 	defer cluster.PanicHandler(t)
-	clusterInstance := utils.SetupReparentCluster(t)
+	clusterInstance := utils.SetupReparentCluster(t, true)
 	defer utils.TeardownCluster(clusterInstance)
 	tablets := clusterInstance.Keyspaces[0].Shards[0].Vttablets
 
diff --git a/go/test/endtoend/reparent/utils/utils.go b/go/test/endtoend/reparent/utils/utils.go
index 326e17e7cc6..a254946ab7a 100644
--- a/go/test/endtoend/reparent/utils/utils.go
+++ b/go/test/endtoend/reparent/utils/utils.go
@@ -64,13 +64,13 @@ var (
 //region cluster setup/teardown
 
 // SetupReparentCluster is used to setup the reparent cluster
-func SetupReparentCluster(t *testing.T) *cluster.LocalProcessCluster {
-	return setupCluster(context.Background(), t, ShardName, []string{cell1, cell2}, []int{3, 1})
+func SetupReparentCluster(t *testing.T, enableSemiSync bool) *cluster.LocalProcessCluster {
+	return setupCluster(context.Background(), t, ShardName, []string{cell1, cell2}, []int{3, 1}, enableSemiSync)
 }
 
 // SetupRangeBasedCluster sets up the range based cluster
 func SetupRangeBasedCluster(ctx context.Context, t *testing.T) *cluster.LocalProcessCluster {
-	return setupCluster(ctx, t, ShardName, []string{cell1}, []int{2})
+	return setupCluster(ctx, t, ShardName, []string{cell1}, []int{2}, true)
 }
 
 // TeardownCluster is used to teardown the reparent cluster
@@ -78,7 +78,7 @@ func TeardownCluster(clusterInstance *cluster.LocalProcessCluster) {
 	clusterInstance.Teardown()
 }
 
-func setupCluster(ctx context.Context, t *testing.T, shardName string, cells []string, numTablets []int) *cluster.LocalProcessCluster {
+func setupCluster(ctx context.Context, t *testing.T, shardName string, cells []string, numTablets []int, enableSemiSync bool) *cluster.LocalProcessCluster {
 	var tablets []*cluster.Vttablet
 	clusterInstance := cluster.NewCluster(cells[0], Hostname)
 	keyspace := &cluster.Keyspace{Name: KeyspaceName}
@@ -117,7 +117,6 @@ func setupCluster(ctx context.Context, t *testing.T, shardName string, cells []s
 
 	clusterInstance.VtTabletExtraArgs = []string{
 		"-lock_tables_timeout", "5s",
-		"-enable_semi_sync",
 		"-init_populate_metadata",
 		"-track_schema_versions=true",
 		// disabling online-ddl for reparent tests. This is done to reduce flakiness.
@@ -128,6 +127,9 @@ func setupCluster(ctx context.Context, t *testing.T, shardName string, cells []s
 		// DemotePrimary rpc is stalled!
 		"-queryserver_enable_online_ddl=false",
 	}
+	if enableSemiSync {
+		clusterInstance.VtTabletExtraArgs = append(clusterInstance.VtTabletExtraArgs, "-enable_semi_sync")
+	}
 
 	// Initialize Cluster
 	err = clusterInstance.SetupCluster(keyspace, []cluster.Shard{*shard})
@@ -400,6 +402,12 @@ func CheckInsertedValues(ctx context.Context, t *testing.T, tablet *cluster.Vtta
 	return fmt.Errorf("data is not yet replicated on tablet %s", tablet.Alias)
 }
 
+func CheckSemiSyncSetupCorrectly(t *testing.T, tablet *cluster.Vttablet, semiSyncVal string) {
+	dbVar, err := tablet.VttabletProcess.GetDBVar("rpl_semi_sync_slave_enabled", "")
+	require.NoError(t, err)
+	require.Equal(t, semiSyncVal, dbVar)
+}
+
 // CheckCountOfInsertedValues checks that the number of inserted values matches the given count on the given tablet
 func CheckCountOfInsertedValues(ctx context.Context, t *testing.T, tablet *cluster.Vttablet, count int) error {
 	selectSQL := "select * from vt_insert_test"

From 7cab69e987c72ec2fffdd70d789f99f0d772cac4 Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Fri, 14 Jan 2022 11:18:41 +0530
Subject: [PATCH 02/30] feat: change PromoteReplica rpc to allow passing in
 semiSync as a parameter

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 go/test/fuzzing/vttablet_fuzzer.go            |  2 +-
 .../tabletmanagerdata/tabletmanagerdata.pb.go | 85 +++++++++++--------
 .../tabletmanagerdata_vtproto.pb.go           | 33 +++++++
 go/vt/vtcombo/tablet_map.go                   |  2 +-
 .../testutil/test_tmclient.go                 |  2 +-
 .../reparentutil/emergency_reparenter.go      |  2 +-
 .../vtctl/reparentutil/planned_reparenter.go  |  4 +-
 go/vt/vttablet/faketmclient/fake_client.go    |  2 +-
 go/vt/vttablet/grpctmclient/client.go         |  6 +-
 go/vt/vttablet/grpctmserver/server.go         |  2 +-
 go/vt/vttablet/tabletmanager/rpc_agent.go     |  2 +-
 .../vttablet/tabletmanager/rpc_replication.go |  2 +-
 .../tabletmanager/rpc_replication_test.go     |  2 +-
 go/vt/vttablet/tmclient/rpc_client_api.go     |  2 +-
 go/vt/vttablet/tmrpctest/test_tm_rpc.go       |  6 +-
 proto/tabletmanagerdata.proto                 |  1 +
 web/vtadmin/src/proto/vtadmin.d.ts            | 18 ++++
 web/vtadmin/src/proto/vtadmin.js              | 77 ++++++++++++++++-
 18 files changed, 193 insertions(+), 57 deletions(-)

diff --git a/go/test/fuzzing/vttablet_fuzzer.go b/go/test/fuzzing/vttablet_fuzzer.go
index b3266de811e..96c3cfc36df 100644
--- a/go/test/fuzzing/vttablet_fuzzer.go
+++ b/go/test/fuzzing/vttablet_fuzzer.go
@@ -441,7 +441,7 @@ func (fs *fuzzStore) callPromoteReplica() error {
 	if err != nil {
 		return err
 	}
-	_, _ = fs.client.PromoteReplica(context.Background(), tablet)
+	_, _ = fs.client.PromoteReplica(context.Background(), tablet, false)
 	return nil
 }
 
diff --git a/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go b/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go
index b23d8905d6a..7bea4dc288b 100644
--- a/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go
+++ b/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go
@@ -4268,6 +4268,8 @@ type PromoteReplicaRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
+
+	SemiSync bool `protobuf:"varint,1,opt,name=semiSync,proto3" json:"semiSync,omitempty"`
 }
 
 func (x *PromoteReplicaRequest) Reset() {
@@ -4302,6 +4304,13 @@ func (*PromoteReplicaRequest) Descriptor() ([]byte, []int) {
 	return file_tabletmanagerdata_proto_rawDescGZIP(), []int{88}
 }
 
+func (x *PromoteReplicaRequest) GetSemiSync() bool {
+	if x != nil {
+		return x.SemiSync
+	}
+	return false
+}
+
 type PromoteReplicaResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -5074,43 +5083,45 @@ var file_tabletmanagerdata_proto_rawDesc = []byte{
 	0x20, 0x01, 0x28, 0x0b, 0x32, 0x26, 0x2e, 0x72, 0x65, 0x70, 0x6c, 0x69, 0x63, 0x61, 0x74, 0x69,
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+	0x72, 0x65, 0x73, 0x75, 0x6c, 0x74, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x12, 0x2e, 0x71,
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+	0x52, 0x06, 0x72, 0x65, 0x73, 0x75, 0x6c, 0x74, 0x42, 0x30, 0x5a, 0x2e, 0x76, 0x69, 0x74, 0x65,
+	0x73, 0x73, 0x2e, 0x69, 0x6f, 0x2f, 0x76, 0x69, 0x74, 0x65, 0x73, 0x73, 0x2f, 0x67, 0x6f, 0x2f,
+	0x76, 0x74, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x74, 0x61, 0x62, 0x6c, 0x65, 0x74, 0x6d,
+	0x61, 0x6e, 0x61, 0x67, 0x65, 0x72, 0x64, 0x61, 0x74, 0x61, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x33,
 }
 
 var (
diff --git a/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go b/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go
index 72d241b3609..5fc6d03da1e 100644
--- a/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go
+++ b/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go
@@ -3778,6 +3778,16 @@ func (m *PromoteReplicaRequest) MarshalToSizedBufferVT(dAtA []byte) (int, error)
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
+	if m.SemiSync {
+		i--
+		if m.SemiSync {
+			dAtA[i] = 1
+		} else {
+			dAtA[i] = 0
+		}
+		i--
+		dAtA[i] = 0x8
+	}
 	return len(dAtA) - i, nil
 }
 
@@ -5576,6 +5586,9 @@ func (m *PromoteReplicaRequest) SizeVT() (n int) {
 	}
 	var l int
 	_ = l
+	if m.SemiSync {
+		n += 2
+	}
 	if m.unknownFields != nil {
 		n += len(m.unknownFields)
 	}
@@ -13481,6 +13494,26 @@ func (m *PromoteReplicaRequest) UnmarshalVT(dAtA []byte) error {
 			return fmt.Errorf("proto: PromoteReplicaRequest: illegal tag %d (wire type %d)", fieldNum, wire)
 		}
 		switch fieldNum {
+		case 1:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field SemiSync", wireType)
+			}
+			var v int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				v |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			m.SemiSync = bool(v != 0)
 		default:
 			iNdEx = preIndex
 			skippy, err := skip(dAtA[iNdEx:])
diff --git a/go/vt/vtcombo/tablet_map.go b/go/vt/vtcombo/tablet_map.go
index 8b0c12f728f..cd2c59b2f1f 100644
--- a/go/vt/vtcombo/tablet_map.go
+++ b/go/vt/vtcombo/tablet_map.go
@@ -969,7 +969,7 @@ func (itmc *internalTabletManagerClient) StopReplicationAndGetStatus(context.Con
 	return nil, nil, fmt.Errorf("not implemented in vtcombo")
 }
 
-func (itmc *internalTabletManagerClient) PromoteReplica(context.Context, *topodatapb.Tablet) (string, error) {
+func (itmc *internalTabletManagerClient) PromoteReplica(context.Context, *topodatapb.Tablet, bool) (string, error) {
 	return "", fmt.Errorf("not implemented in vtcombo")
 }
 
diff --git a/go/vt/vtctl/grpcvtctldserver/testutil/test_tmclient.go b/go/vt/vtctl/grpcvtctldserver/testutil/test_tmclient.go
index 56fcd0e5322..8f183aabeca 100644
--- a/go/vt/vtctl/grpcvtctldserver/testutil/test_tmclient.go
+++ b/go/vt/vtctl/grpcvtctldserver/testutil/test_tmclient.go
@@ -459,7 +459,7 @@ func (fake *TabletManagerClient) PopulateReparentJournal(ctx context.Context, ta
 }
 
 // PromoteReplica is part of the tmclient.TabletManagerClient interface.
-func (fake *TabletManagerClient) PromoteReplica(ctx context.Context, tablet *topodatapb.Tablet) (string, error) {
+func (fake *TabletManagerClient) PromoteReplica(ctx context.Context, tablet *topodatapb.Tablet, semiSync bool) (string, error) {
 	if fake.PromoteReplicaResults == nil {
 		return "", assert.AnError
 	}
diff --git a/go/vt/vtctl/reparentutil/emergency_reparenter.go b/go/vt/vtctl/reparentutil/emergency_reparenter.go
index 39ff19c9ff5..ca4c17a8320 100644
--- a/go/vt/vtctl/reparentutil/emergency_reparenter.go
+++ b/go/vt/vtctl/reparentutil/emergency_reparenter.go
@@ -714,7 +714,7 @@ func (erp *EmergencyReparenter) promoteNewPrimary(
 ) error {
 	erp.logger.Infof("starting promotion for the new primary - %v", newPrimary.Alias)
 	// we call PromoteReplica which changes the tablet type, fixes the semi-sync, set the primary to read-write and flushes the binlogs
-	_, err := erp.tmc.PromoteReplica(ctx, newPrimary)
+	_, err := erp.tmc.PromoteReplica(ctx, newPrimary, SemiSyncAckers(newPrimary) > 0)
 	if err != nil {
 		return vterrors.Wrapf(err, "primary-elect tablet %v failed to be upgraded to primary: %v", newPrimary.Alias, err)
 	}
diff --git a/go/vt/vtctl/reparentutil/planned_reparenter.go b/go/vt/vtctl/reparentutil/planned_reparenter.go
index 8d089be9a8d..578126cc36c 100644
--- a/go/vt/vtctl/reparentutil/planned_reparenter.go
+++ b/go/vt/vtctl/reparentutil/planned_reparenter.go
@@ -288,7 +288,7 @@ func (pr *PlannedReparenter) performGracefulPromotion(
 	promoteCtx, promoteCancel := context.WithTimeout(ctx, opts.WaitReplicasTimeout)
 	defer promoteCancel()
 
-	rp, err := pr.tmc.PromoteReplica(promoteCtx, primaryElect)
+	rp, err := pr.tmc.PromoteReplica(promoteCtx, primaryElect, SemiSyncAckers(primaryElect) > 0)
 	if err != nil {
 		return "", vterrors.Wrapf(err, "primary-elect tablet %v failed to be promoted to primary; please try again", primaryElectAliasStr)
 	}
@@ -485,7 +485,7 @@ func (pr *PlannedReparenter) performPotentialPromotion(
 	promoteCtx, promoteCancel := context.WithTimeout(ctx, *topo.RemoteOperationTimeout)
 	defer promoteCancel()
 
-	rp, err := pr.tmc.PromoteReplica(promoteCtx, primaryElect)
+	rp, err := pr.tmc.PromoteReplica(promoteCtx, primaryElect, SemiSyncAckers(primaryElect) > 0)
 	if err != nil {
 		return "", vterrors.Wrapf(err, "failed to promote %v to primary", primaryElectAliasStr)
 	}
diff --git a/go/vt/vttablet/faketmclient/fake_client.go b/go/vt/vttablet/faketmclient/fake_client.go
index eb6bc014bf6..8838a1848cf 100644
--- a/go/vt/vttablet/faketmclient/fake_client.go
+++ b/go/vt/vttablet/faketmclient/fake_client.go
@@ -331,7 +331,7 @@ func (client *FakeTabletManagerClient) StopReplicationAndGetStatus(ctx context.C
 }
 
 // PromoteReplica is part of the tmclient.TabletManagerClient interface.
-func (client *FakeTabletManagerClient) PromoteReplica(ctx context.Context, tablet *topodatapb.Tablet) (string, error) {
+func (client *FakeTabletManagerClient) PromoteReplica(ctx context.Context, tablet *topodatapb.Tablet, semiSync bool) (string, error) {
 	return "", nil
 }
 
diff --git a/go/vt/vttablet/grpctmclient/client.go b/go/vt/vttablet/grpctmclient/client.go
index 6e547f40993..c7b67541fc6 100644
--- a/go/vt/vttablet/grpctmclient/client.go
+++ b/go/vt/vttablet/grpctmclient/client.go
@@ -934,14 +934,16 @@ func (client *Client) StopReplicationAndGetStatus(ctx context.Context, tablet *t
 }
 
 // PromoteReplica is part of the tmclient.TabletManagerClient interface.
-func (client *Client) PromoteReplica(ctx context.Context, tablet *topodatapb.Tablet) (string, error) {
+func (client *Client) PromoteReplica(ctx context.Context, tablet *topodatapb.Tablet, semiSync bool) (string, error) {
 	c, closer, err := client.dialer.dial(ctx, tablet)
 	if err != nil {
 		return "", err
 	}
 	defer closer.Close()
 
-	response, err := c.PromoteReplica(ctx, &tabletmanagerdatapb.PromoteReplicaRequest{})
+	response, err := c.PromoteReplica(ctx, &tabletmanagerdatapb.PromoteReplicaRequest{
+		SemiSync: semiSync,
+	})
 	if err != nil {
 		return "", err
 	}
diff --git a/go/vt/vttablet/grpctmserver/server.go b/go/vt/vttablet/grpctmserver/server.go
index 1b390b9d76c..a8cc0c3a684 100644
--- a/go/vt/vttablet/grpctmserver/server.go
+++ b/go/vt/vttablet/grpctmserver/server.go
@@ -508,7 +508,7 @@ func (s *server) PromoteReplica(ctx context.Context, request *tabletmanagerdatap
 	defer s.tm.HandleRPCPanic(ctx, "PromoteReplica", request, response, true /*verbose*/, &err)
 	ctx = callinfo.GRPCCallInfo(ctx)
 	response = &tabletmanagerdatapb.PromoteReplicaResponse{}
-	position, err := s.tm.PromoteReplica(ctx)
+	position, err := s.tm.PromoteReplica(ctx, request.GetSemiSync())
 	if err == nil {
 		response.Position = position
 	}
diff --git a/go/vt/vttablet/tabletmanager/rpc_agent.go b/go/vt/vttablet/tabletmanager/rpc_agent.go
index 7f96145fb9a..7cad70b295e 100644
--- a/go/vt/vttablet/tabletmanager/rpc_agent.go
+++ b/go/vt/vttablet/tabletmanager/rpc_agent.go
@@ -143,7 +143,7 @@ type RPCTM interface {
 
 	ReplicaWasRestarted(ctx context.Context, parent *topodatapb.TabletAlias) error
 
-	PromoteReplica(ctx context.Context) (string, error)
+	PromoteReplica(ctx context.Context, semiSync bool) (string, error)
 
 	// Backup / restore related methods
 
diff --git a/go/vt/vttablet/tabletmanager/rpc_replication.go b/go/vt/vttablet/tabletmanager/rpc_replication.go
index 4a42f17d897..277e4bf2a11 100644
--- a/go/vt/vttablet/tabletmanager/rpc_replication.go
+++ b/go/vt/vttablet/tabletmanager/rpc_replication.go
@@ -797,7 +797,7 @@ type StopReplicationAndGetStatusResponse struct {
 }
 
 // PromoteReplica makes the current tablet the primary
-func (tm *TabletManager) PromoteReplica(ctx context.Context) (string, error) {
+func (tm *TabletManager) PromoteReplica(ctx context.Context, semiSync bool) (string, error) {
 	log.Infof("PromoteReplica")
 	if err := tm.lock(ctx); err != nil {
 		return "", err
diff --git a/go/vt/vttablet/tabletmanager/rpc_replication_test.go b/go/vt/vttablet/tabletmanager/rpc_replication_test.go
index 95fbb51831d..a6cf48a6a61 100644
--- a/go/vt/vttablet/tabletmanager/rpc_replication_test.go
+++ b/go/vt/vttablet/tabletmanager/rpc_replication_test.go
@@ -34,7 +34,7 @@ func TestPromoteReplicaHealthTicksStopped(t *testing.T) {
 	tm := newTestTM(t, ts, 100, keyspace, shard)
 	defer tm.Stop()
 
-	_, err := tm.PromoteReplica(ctx)
+	_, err := tm.PromoteReplica(ctx, false)
 	require.NoError(t, err)
 	require.False(t, tm.replManager.ticks.Running())
 }
diff --git a/go/vt/vttablet/tmclient/rpc_client_api.go b/go/vt/vttablet/tmclient/rpc_client_api.go
index b78b532617c..6156573496e 100644
--- a/go/vt/vttablet/tmclient/rpc_client_api.go
+++ b/go/vt/vttablet/tmclient/rpc_client_api.go
@@ -218,7 +218,7 @@ type TabletManagerClient interface {
 	StopReplicationAndGetStatus(ctx context.Context, tablet *topodatapb.Tablet, stopReplicationMode replicationdatapb.StopReplicationMode) (*replicationdatapb.Status, *replicationdatapb.StopReplicationStatus, error)
 
 	// PromoteReplica makes the tablet the new primary
-	PromoteReplica(ctx context.Context, tablet *topodatapb.Tablet) (string, error)
+	PromoteReplica(ctx context.Context, tablet *topodatapb.Tablet, semiSync bool) (string, error)
 
 	//
 	// Backup / restore related methods
diff --git a/go/vt/vttablet/tmrpctest/test_tm_rpc.go b/go/vt/vttablet/tmrpctest/test_tm_rpc.go
index 7d95ef8d041..6c45e7c0e2a 100644
--- a/go/vt/vttablet/tmrpctest/test_tm_rpc.go
+++ b/go/vt/vttablet/tmrpctest/test_tm_rpc.go
@@ -1192,7 +1192,7 @@ func tmRPCTestStopReplicationAndGetStatusPanic(ctx context.Context, t *testing.T
 	expectHandleRPCPanic(t, "StopReplicationAndGetStatus", true /*verbose*/, err)
 }
 
-func (fra *fakeRPCTM) PromoteReplica(ctx context.Context) (string, error) {
+func (fra *fakeRPCTM) PromoteReplica(ctx context.Context, semiSync bool) (string, error) {
 	if fra.panics {
 		panic(fmt.Errorf("test-triggered panic"))
 	}
@@ -1200,12 +1200,12 @@ func (fra *fakeRPCTM) PromoteReplica(ctx context.Context) (string, error) {
 }
 
 func tmRPCTestPromoteReplica(ctx context.Context, t *testing.T, client tmclient.TabletManagerClient, tablet *topodatapb.Tablet) {
-	rp, err := client.PromoteReplica(ctx, tablet)
+	rp, err := client.PromoteReplica(ctx, tablet, false)
 	compareError(t, "PromoteReplica", err, rp, testReplicationPosition)
 }
 
 func tmRPCTestPromoteReplicaPanic(ctx context.Context, t *testing.T, client tmclient.TabletManagerClient, tablet *topodatapb.Tablet) {
-	_, err := client.PromoteReplica(ctx, tablet)
+	_, err := client.PromoteReplica(ctx, tablet, false)
 	expectHandleRPCPanic(t, "PromoteReplica", true /*verbose*/, err)
 }
 
diff --git a/proto/tabletmanagerdata.proto b/proto/tabletmanagerdata.proto
index d4bd2885e02..c2f44c266cc 100644
--- a/proto/tabletmanagerdata.proto
+++ b/proto/tabletmanagerdata.proto
@@ -440,6 +440,7 @@ message StopReplicationAndGetStatusResponse {
 }
 
 message PromoteReplicaRequest {
+  bool semiSync = 1;
 }
 
 message PromoteReplicaResponse {
diff --git a/web/vtadmin/src/proto/vtadmin.d.ts b/web/vtadmin/src/proto/vtadmin.d.ts
index 177aa7b7430..32ee267d60f 100644
--- a/web/vtadmin/src/proto/vtadmin.d.ts
+++ b/web/vtadmin/src/proto/vtadmin.d.ts
@@ -18358,6 +18358,9 @@ export namespace tabletmanagerdata {
 
     /** Properties of a PromoteReplicaRequest. */
     interface IPromoteReplicaRequest {
+
+        /** PromoteReplicaRequest semiSync */
+        semiSync?: (boolean|null);
     }
 
     /** Represents a PromoteReplicaRequest. */
@@ -18369,6 +18372,9 @@ export namespace tabletmanagerdata {
          */
         constructor(properties?: tabletmanagerdata.IPromoteReplicaRequest);
 
+        /** PromoteReplicaRequest semiSync. */
+        public semiSync: boolean;
+
         /**
          * Creates a new PromoteReplicaRequest instance using the specified properties.
          * @param [properties] Properties to set
@@ -43087,6 +43093,12 @@ export namespace binlogdata {
 
         /** VEvent last_p_k_event */
         last_p_k_event?: (binlogdata.ILastPKEvent|null);
+
+        /** VEvent keyspace */
+        keyspace?: (string|null);
+
+        /** VEvent shard */
+        shard?: (string|null);
     }
 
     /** Represents a VEvent. */
@@ -43131,6 +43143,12 @@ export namespace binlogdata {
         /** VEvent last_p_k_event. */
         public last_p_k_event?: (binlogdata.ILastPKEvent|null);
 
+        /** VEvent keyspace. */
+        public keyspace: string;
+
+        /** VEvent shard. */
+        public shard: string;
+
         /**
          * Creates a new VEvent instance using the specified properties.
          * @param [properties] Properties to set
diff --git a/web/vtadmin/src/proto/vtadmin.js b/web/vtadmin/src/proto/vtadmin.js
index cf4aada06c1..cc370ee9d8c 100644
--- a/web/vtadmin/src/proto/vtadmin.js
+++ b/web/vtadmin/src/proto/vtadmin.js
@@ -41448,6 +41448,7 @@ $root.tabletmanagerdata = (function() {
          * Properties of a PromoteReplicaRequest.
          * @memberof tabletmanagerdata
          * @interface IPromoteReplicaRequest
+         * @property {boolean|null} [semiSync] PromoteReplicaRequest semiSync
          */
 
         /**
@@ -41465,6 +41466,14 @@ $root.tabletmanagerdata = (function() {
                         this[keys[i]] = properties[keys[i]];
         }
 
+        /**
+         * PromoteReplicaRequest semiSync.
+         * @member {boolean} semiSync
+         * @memberof tabletmanagerdata.PromoteReplicaRequest
+         * @instance
+         */
+        PromoteReplicaRequest.prototype.semiSync = false;
+
         /**
          * Creates a new PromoteReplicaRequest instance using the specified properties.
          * @function create
@@ -41489,6 +41498,8 @@ $root.tabletmanagerdata = (function() {
         PromoteReplicaRequest.encode = function encode(message, writer) {
             if (!writer)
                 writer = $Writer.create();
+            if (message.semiSync != null && Object.hasOwnProperty.call(message, "semiSync"))
+                writer.uint32(/* id 1, wireType 0 =*/8).bool(message.semiSync);
             return writer;
         };
 
@@ -41523,6 +41534,9 @@ $root.tabletmanagerdata = (function() {
             while (reader.pos < end) {
                 var tag = reader.uint32();
                 switch (tag >>> 3) {
+                case 1:
+                    message.semiSync = reader.bool();
+                    break;
                 default:
                     reader.skipType(tag & 7);
                     break;
@@ -41558,6 +41572,9 @@ $root.tabletmanagerdata = (function() {
         PromoteReplicaRequest.verify = function verify(message) {
             if (typeof message !== "object" || message === null)
                 return "object expected";
+            if (message.semiSync != null && message.hasOwnProperty("semiSync"))
+                if (typeof message.semiSync !== "boolean")
+                    return "semiSync: boolean expected";
             return null;
         };
 
@@ -41572,7 +41589,10 @@ $root.tabletmanagerdata = (function() {
         PromoteReplicaRequest.fromObject = function fromObject(object) {
             if (object instanceof $root.tabletmanagerdata.PromoteReplicaRequest)
                 return object;
-            return new $root.tabletmanagerdata.PromoteReplicaRequest();
+            var message = new $root.tabletmanagerdata.PromoteReplicaRequest();
+            if (object.semiSync != null)
+                message.semiSync = Boolean(object.semiSync);
+            return message;
         };
 
         /**
@@ -41584,8 +41604,15 @@ $root.tabletmanagerdata = (function() {
          * @param {$protobuf.IConversionOptions} [options] Conversion options
          * @returns {Object.<string,*>} Plain object
          */
-        PromoteReplicaRequest.toObject = function toObject() {
-            return {};
+        PromoteReplicaRequest.toObject = function toObject(message, options) {
+            if (!options)
+                options = {};
+            var object = {};
+            if (options.defaults)
+                object.semiSync = false;
+            if (message.semiSync != null && message.hasOwnProperty("semiSync"))
+                object.semiSync = message.semiSync;
+            return object;
         };
 
         /**
@@ -101946,6 +101973,8 @@ $root.binlogdata = (function() {
          * @property {string|null} [dml] VEvent dml
          * @property {number|Long|null} [current_time] VEvent current_time
          * @property {binlogdata.ILastPKEvent|null} [last_p_k_event] VEvent last_p_k_event
+         * @property {string|null} [keyspace] VEvent keyspace
+         * @property {string|null} [shard] VEvent shard
          */
 
         /**
@@ -102051,6 +102080,22 @@ $root.binlogdata = (function() {
          */
         VEvent.prototype.last_p_k_event = null;
 
+        /**
+         * VEvent keyspace.
+         * @member {string} keyspace
+         * @memberof binlogdata.VEvent
+         * @instance
+         */
+        VEvent.prototype.keyspace = "";
+
+        /**
+         * VEvent shard.
+         * @member {string} shard
+         * @memberof binlogdata.VEvent
+         * @instance
+         */
+        VEvent.prototype.shard = "";
+
         /**
          * Creates a new VEvent instance using the specified properties.
          * @function create
@@ -102097,6 +102142,10 @@ $root.binlogdata = (function() {
                 writer.uint32(/* id 20, wireType 0 =*/160).int64(message.current_time);
             if (message.last_p_k_event != null && Object.hasOwnProperty.call(message, "last_p_k_event"))
                 $root.binlogdata.LastPKEvent.encode(message.last_p_k_event, writer.uint32(/* id 21, wireType 2 =*/170).fork()).ldelim();
+            if (message.keyspace != null && Object.hasOwnProperty.call(message, "keyspace"))
+                writer.uint32(/* id 22, wireType 2 =*/178).string(message.keyspace);
+            if (message.shard != null && Object.hasOwnProperty.call(message, "shard"))
+                writer.uint32(/* id 23, wireType 2 =*/186).string(message.shard);
             return writer;
         };
 
@@ -102164,6 +102213,12 @@ $root.binlogdata = (function() {
                 case 21:
                     message.last_p_k_event = $root.binlogdata.LastPKEvent.decode(reader, reader.uint32());
                     break;
+                case 22:
+                    message.keyspace = reader.string();
+                    break;
+                case 23:
+                    message.shard = reader.string();
+                    break;
                 default:
                     reader.skipType(tag & 7);
                     break;
@@ -102265,6 +102320,12 @@ $root.binlogdata = (function() {
                 if (error)
                     return "last_p_k_event." + error;
             }
+            if (message.keyspace != null && message.hasOwnProperty("keyspace"))
+                if (!$util.isString(message.keyspace))
+                    return "keyspace: string expected";
+            if (message.shard != null && message.hasOwnProperty("shard"))
+                if (!$util.isString(message.shard))
+                    return "shard: string expected";
             return null;
         };
 
@@ -102411,6 +102472,10 @@ $root.binlogdata = (function() {
                     throw TypeError(".binlogdata.VEvent.last_p_k_event: object expected");
                 message.last_p_k_event = $root.binlogdata.LastPKEvent.fromObject(object.last_p_k_event);
             }
+            if (object.keyspace != null)
+                message.keyspace = String(object.keyspace);
+            if (object.shard != null)
+                message.shard = String(object.shard);
             return message;
         };
 
@@ -102447,6 +102512,8 @@ $root.binlogdata = (function() {
                 } else
                     object.current_time = options.longs === String ? "0" : 0;
                 object.last_p_k_event = null;
+                object.keyspace = "";
+                object.shard = "";
             }
             if (message.type != null && message.hasOwnProperty("type"))
                 object.type = options.enums === String ? $root.binlogdata.VEventType[message.type] : message.type;
@@ -102476,6 +102543,10 @@ $root.binlogdata = (function() {
                     object.current_time = options.longs === String ? $util.Long.prototype.toString.call(message.current_time) : options.longs === Number ? new $util.LongBits(message.current_time.low >>> 0, message.current_time.high >>> 0).toNumber() : message.current_time;
             if (message.last_p_k_event != null && message.hasOwnProperty("last_p_k_event"))
                 object.last_p_k_event = $root.binlogdata.LastPKEvent.toObject(message.last_p_k_event, options);
+            if (message.keyspace != null && message.hasOwnProperty("keyspace"))
+                object.keyspace = message.keyspace;
+            if (message.shard != null && message.hasOwnProperty("shard"))
+                object.shard = message.shard;
             return object;
         };
 

From f18174b8e3574aea834ea390337355d658044268 Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Fri, 14 Jan 2022 11:44:27 +0530
Subject: [PATCH 03/30] feat: add semiSync as a parameter to fixSemiSync and
 use it log differences with enable_semi_sync flag

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 go/vt/vttablet/tabletmanager/restore.go       |  2 +-
 go/vt/vttablet/tabletmanager/rpc_actions.go   |  2 +-
 .../vttablet/tabletmanager/rpc_replication.go | 31 ++++++++++++-------
 3 files changed, 22 insertions(+), 13 deletions(-)

diff --git a/go/vt/vttablet/tabletmanager/restore.go b/go/vt/vttablet/tabletmanager/restore.go
index 2fe77203375..53e2284455d 100644
--- a/go/vt/vttablet/tabletmanager/restore.go
+++ b/go/vt/vttablet/tabletmanager/restore.go
@@ -527,7 +527,7 @@ func (tm *TabletManager) startReplication(ctx context.Context, pos mysql.Positio
 	}
 
 	// If using semi-sync, we need to enable it before connecting to primary.
-	if err := tm.fixSemiSync(tabletType); err != nil {
+	if err := tm.fixSemiSync(tabletType, false); err != nil {
 		return err
 	}
 
diff --git a/go/vt/vttablet/tabletmanager/rpc_actions.go b/go/vt/vttablet/tabletmanager/rpc_actions.go
index 4c913a2f0f1..3430c84176a 100644
--- a/go/vt/vttablet/tabletmanager/rpc_actions.go
+++ b/go/vt/vttablet/tabletmanager/rpc_actions.go
@@ -89,7 +89,7 @@ func (tm *TabletManager) changeTypeLocked(ctx context.Context, tabletType topoda
 	}
 
 	// Let's see if we need to fix semi-sync acking.
-	if err := tm.fixSemiSyncAndReplication(tm.Tablet().Type); err != nil {
+	if err := tm.fixSemiSyncAndReplication(tm.Tablet().Type, false); err != nil {
 		return vterrors.Wrap(err, "fixSemiSyncAndReplication failed, may not ack correctly")
 	}
 	return nil
diff --git a/go/vt/vttablet/tabletmanager/rpc_replication.go b/go/vt/vttablet/tabletmanager/rpc_replication.go
index 277e4bf2a11..9a367d772c9 100644
--- a/go/vt/vttablet/tabletmanager/rpc_replication.go
+++ b/go/vt/vttablet/tabletmanager/rpc_replication.go
@@ -193,7 +193,7 @@ func (tm *TabletManager) StartReplication(ctx context.Context) error {
 		}
 	}()
 
-	if err := tm.fixSemiSync(tm.Tablet().Type); err != nil {
+	if err := tm.fixSemiSync(tm.Tablet().Type, false); err != nil {
 		return err
 	}
 	return tm.MysqlDaemon.StartReplication(tm.hookExtraEnv())
@@ -279,7 +279,7 @@ func (tm *TabletManager) InitPrimary(ctx context.Context) (string, error) {
 
 	// Enforce semi-sync after changing the tablet)type to PRIMARY. Otherwise, the
 	// primary will hang while trying to create the database.
-	if err := tm.fixSemiSync(topodatapb.TabletType_PRIMARY); err != nil {
+	if err := tm.fixSemiSync(topodatapb.TabletType_PRIMARY, false); err != nil {
 		return "", err
 	}
 
@@ -343,7 +343,7 @@ func (tm *TabletManager) InitReplica(ctx context.Context, parent *topodatapb.Tab
 	if tt == topodatapb.TabletType_PRIMARY {
 		tt = topodatapb.TabletType_REPLICA
 	}
-	if err := tm.fixSemiSync(tt); err != nil {
+	if err := tm.fixSemiSync(tt, false); err != nil {
 		return err
 	}
 
@@ -465,13 +465,13 @@ func (tm *TabletManager) demotePrimary(ctx context.Context, revertPartialFailure
 	}()
 
 	// If using semi-sync, we need to disable primary-side.
-	if err := tm.fixSemiSync(topodatapb.TabletType_REPLICA); err != nil {
+	if err := tm.fixSemiSync(topodatapb.TabletType_REPLICA, false); err != nil {
 		return nil, err
 	}
 	defer func() {
 		if finalErr != nil && revertPartialFailure && wasPrimary {
 			// enable primary-side semi-sync again
-			if err := tm.fixSemiSync(topodatapb.TabletType_PRIMARY); err != nil {
+			if err := tm.fixSemiSync(topodatapb.TabletType_PRIMARY, false); err != nil {
 				log.Warningf("fixSemiSync(PRIMARY) failed during revert: %v", err)
 			}
 		}
@@ -501,7 +501,7 @@ func (tm *TabletManager) UndoDemotePrimary(ctx context.Context) error {
 	defer tm.unlock()
 
 	// If using semi-sync, we need to enable source-side.
-	if err := tm.fixSemiSync(topodatapb.TabletType_PRIMARY); err != nil {
+	if err := tm.fixSemiSync(topodatapb.TabletType_PRIMARY, false); err != nil {
 		return err
 	}
 
@@ -628,7 +628,7 @@ func (tm *TabletManager) setReplicationSourceLocked(ctx context.Context, parentA
 	if tabletType == topodatapb.TabletType_PRIMARY {
 		tabletType = topodatapb.TabletType_REPLICA
 	}
-	if err := tm.fixSemiSync(tabletType); err != nil {
+	if err := tm.fixSemiSync(tabletType, false); err != nil {
 		return err
 	}
 	// Update the primary/source address only if needed.
@@ -821,7 +821,7 @@ func (tm *TabletManager) PromoteReplica(ctx context.Context, semiSync bool) (str
 	}
 
 	// If using semi-sync, we need to enable it before going read-write.
-	if err := tm.fixSemiSync(topodatapb.TabletType_PRIMARY); err != nil {
+	if err := tm.fixSemiSync(topodatapb.TabletType_PRIMARY, semiSync); err != nil {
 		return "", err
 	}
 
@@ -857,24 +857,33 @@ func isPrimaryEligible(tabletType topodatapb.TabletType) bool {
 	return false
 }
 
-func (tm *TabletManager) fixSemiSync(tabletType topodatapb.TabletType) error {
+func (tm *TabletManager) fixSemiSync(tabletType topodatapb.TabletType, semiSync bool) error {
 	if !*enableSemiSync {
 		// Semi-sync handling is not enabled.
+		if semiSync {
+			log.Error("invalid configuration - semi-sync should be setup according to durability policies, but enable_semi_sync is not set")
+		}
 		return nil
 	}
 
 	// Only enable if we're eligible for becoming primary (REPLICA type).
 	// Ineligible tablets (RDONLY) shouldn't ACK because we'll never promote them.
 	if !isPrimaryEligible(tabletType) {
+		if semiSync {
+			log.Error("invalid configuration - semi-sync should be setup according to durability policies, but the tablet is not primaryEligible")
+		}
 		return tm.MysqlDaemon.SetSemiSyncEnabled(false, false)
 	}
 
+	if !semiSync {
+		log.Error("invalid configuration - enabling semi sync even though not specified by durability policies. Possibly in the process of upgrading.")
+	}
 	// Always enable replica-side since it doesn't hurt to keep it on for a primary.
 	// The primary-side needs to be off for a replica, or else it will get stuck.
 	return tm.MysqlDaemon.SetSemiSyncEnabled(tabletType == topodatapb.TabletType_PRIMARY, true)
 }
 
-func (tm *TabletManager) fixSemiSyncAndReplication(tabletType topodatapb.TabletType) error {
+func (tm *TabletManager) fixSemiSyncAndReplication(tabletType topodatapb.TabletType, semiSync bool) error {
 	if !*enableSemiSync {
 		// Semi-sync handling is not enabled.
 		return nil
@@ -887,7 +896,7 @@ func (tm *TabletManager) fixSemiSyncAndReplication(tabletType topodatapb.TabletT
 		return nil
 	}
 
-	if err := tm.fixSemiSync(tabletType); err != nil {
+	if err := tm.fixSemiSync(tabletType, semiSync); err != nil {
 		return vterrors.Wrapf(err, "failed to fixSemiSync(%v)", tabletType)
 	}
 

From 5413fd5361fecf1e644d475e5aeb20eb81dfe569 Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Mon, 17 Jan 2022 09:32:57 +0530
Subject: [PATCH 04/30] feat: change parameter in fixSemiSync to be an enum

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 go/vt/vttablet/tabletmanager/restore.go       |  2 +-
 go/vt/vttablet/tabletmanager/rpc_actions.go   | 20 +++++++++++++-
 .../vttablet/tabletmanager/rpc_replication.go | 26 +++++++++----------
 3 files changed, 33 insertions(+), 15 deletions(-)

diff --git a/go/vt/vttablet/tabletmanager/restore.go b/go/vt/vttablet/tabletmanager/restore.go
index 53e2284455d..d5f30f39ff9 100644
--- a/go/vt/vttablet/tabletmanager/restore.go
+++ b/go/vt/vttablet/tabletmanager/restore.go
@@ -527,7 +527,7 @@ func (tm *TabletManager) startReplication(ctx context.Context, pos mysql.Positio
 	}
 
 	// If using semi-sync, we need to enable it before connecting to primary.
-	if err := tm.fixSemiSync(tabletType, false); err != nil {
+	if err := tm.fixSemiSync(tabletType, SemiSyncActionFalse); err != nil {
 		return err
 	}
 
diff --git a/go/vt/vttablet/tabletmanager/rpc_actions.go b/go/vt/vttablet/tabletmanager/rpc_actions.go
index 3430c84176a..6e83f4a93fb 100644
--- a/go/vt/vttablet/tabletmanager/rpc_actions.go
+++ b/go/vt/vttablet/tabletmanager/rpc_actions.go
@@ -43,6 +43,17 @@ const (
 	DBActionSetReadWrite
 )
 
+// SemiSyncAction is used to tell fixSemiSync whether to change the semi-sync
+// settings or not.
+type SemiSyncAction int
+
+// Allowed values for SemiSyncAction
+const (
+	SemiSyncActionNone = SemiSyncAction(iota)
+	SemiSyncActionTrue
+	SemiSyncActionFalse
+)
+
 // This file contains the implementations of RPCTM methods.
 // Major groups of methods are broken out into files named "rpc_*.go".
 
@@ -89,7 +100,7 @@ func (tm *TabletManager) changeTypeLocked(ctx context.Context, tabletType topoda
 	}
 
 	// Let's see if we need to fix semi-sync acking.
-	if err := tm.fixSemiSyncAndReplication(tm.Tablet().Type, false); err != nil {
+	if err := tm.fixSemiSyncAndReplication(tm.Tablet().Type, SemiSyncActionFalse); err != nil {
 		return vterrors.Wrap(err, "fixSemiSyncAndReplication failed, may not ack correctly")
 	}
 	return nil
@@ -138,3 +149,10 @@ func (tm *TabletManager) RunHealthCheck(ctx context.Context) {
 func (tm *TabletManager) IgnoreHealthError(ctx context.Context, pattern string) error {
 	return vterrors.New(vtrpcpb.Code_INVALID_ARGUMENT, "deprecated")
 }
+
+func convertBoolToSemiSyncAction(semiSync bool) SemiSyncAction {
+	if semiSync {
+		return SemiSyncActionTrue
+	}
+	return SemiSyncActionFalse
+}
diff --git a/go/vt/vttablet/tabletmanager/rpc_replication.go b/go/vt/vttablet/tabletmanager/rpc_replication.go
index 9a367d772c9..c697f84e4ec 100644
--- a/go/vt/vttablet/tabletmanager/rpc_replication.go
+++ b/go/vt/vttablet/tabletmanager/rpc_replication.go
@@ -193,7 +193,7 @@ func (tm *TabletManager) StartReplication(ctx context.Context) error {
 		}
 	}()
 
-	if err := tm.fixSemiSync(tm.Tablet().Type, false); err != nil {
+	if err := tm.fixSemiSync(tm.Tablet().Type, SemiSyncActionFalse); err != nil {
 		return err
 	}
 	return tm.MysqlDaemon.StartReplication(tm.hookExtraEnv())
@@ -279,7 +279,7 @@ func (tm *TabletManager) InitPrimary(ctx context.Context) (string, error) {
 
 	// Enforce semi-sync after changing the tablet)type to PRIMARY. Otherwise, the
 	// primary will hang while trying to create the database.
-	if err := tm.fixSemiSync(topodatapb.TabletType_PRIMARY, false); err != nil {
+	if err := tm.fixSemiSync(topodatapb.TabletType_PRIMARY, SemiSyncActionFalse); err != nil {
 		return "", err
 	}
 
@@ -343,7 +343,7 @@ func (tm *TabletManager) InitReplica(ctx context.Context, parent *topodatapb.Tab
 	if tt == topodatapb.TabletType_PRIMARY {
 		tt = topodatapb.TabletType_REPLICA
 	}
-	if err := tm.fixSemiSync(tt, false); err != nil {
+	if err := tm.fixSemiSync(tt, SemiSyncActionFalse); err != nil {
 		return err
 	}
 
@@ -465,13 +465,13 @@ func (tm *TabletManager) demotePrimary(ctx context.Context, revertPartialFailure
 	}()
 
 	// If using semi-sync, we need to disable primary-side.
-	if err := tm.fixSemiSync(topodatapb.TabletType_REPLICA, false); err != nil {
+	if err := tm.fixSemiSync(topodatapb.TabletType_REPLICA, SemiSyncActionFalse); err != nil {
 		return nil, err
 	}
 	defer func() {
 		if finalErr != nil && revertPartialFailure && wasPrimary {
 			// enable primary-side semi-sync again
-			if err := tm.fixSemiSync(topodatapb.TabletType_PRIMARY, false); err != nil {
+			if err := tm.fixSemiSync(topodatapb.TabletType_PRIMARY, SemiSyncActionFalse); err != nil {
 				log.Warningf("fixSemiSync(PRIMARY) failed during revert: %v", err)
 			}
 		}
@@ -501,7 +501,7 @@ func (tm *TabletManager) UndoDemotePrimary(ctx context.Context) error {
 	defer tm.unlock()
 
 	// If using semi-sync, we need to enable source-side.
-	if err := tm.fixSemiSync(topodatapb.TabletType_PRIMARY, false); err != nil {
+	if err := tm.fixSemiSync(topodatapb.TabletType_PRIMARY, SemiSyncActionFalse); err != nil {
 		return err
 	}
 
@@ -628,7 +628,7 @@ func (tm *TabletManager) setReplicationSourceLocked(ctx context.Context, parentA
 	if tabletType == topodatapb.TabletType_PRIMARY {
 		tabletType = topodatapb.TabletType_REPLICA
 	}
-	if err := tm.fixSemiSync(tabletType, false); err != nil {
+	if err := tm.fixSemiSync(tabletType, SemiSyncActionFalse); err != nil {
 		return err
 	}
 	// Update the primary/source address only if needed.
@@ -821,7 +821,7 @@ func (tm *TabletManager) PromoteReplica(ctx context.Context, semiSync bool) (str
 	}
 
 	// If using semi-sync, we need to enable it before going read-write.
-	if err := tm.fixSemiSync(topodatapb.TabletType_PRIMARY, semiSync); err != nil {
+	if err := tm.fixSemiSync(topodatapb.TabletType_PRIMARY, convertBoolToSemiSyncAction(semiSync)); err != nil {
 		return "", err
 	}
 
@@ -857,10 +857,10 @@ func isPrimaryEligible(tabletType topodatapb.TabletType) bool {
 	return false
 }
 
-func (tm *TabletManager) fixSemiSync(tabletType topodatapb.TabletType, semiSync bool) error {
+func (tm *TabletManager) fixSemiSync(tabletType topodatapb.TabletType, semiSync SemiSyncAction) error {
 	if !*enableSemiSync {
 		// Semi-sync handling is not enabled.
-		if semiSync {
+		if semiSync == SemiSyncActionTrue {
 			log.Error("invalid configuration - semi-sync should be setup according to durability policies, but enable_semi_sync is not set")
 		}
 		return nil
@@ -869,13 +869,13 @@ func (tm *TabletManager) fixSemiSync(tabletType topodatapb.TabletType, semiSync
 	// Only enable if we're eligible for becoming primary (REPLICA type).
 	// Ineligible tablets (RDONLY) shouldn't ACK because we'll never promote them.
 	if !isPrimaryEligible(tabletType) {
-		if semiSync {
+		if semiSync == SemiSyncActionTrue {
 			log.Error("invalid configuration - semi-sync should be setup according to durability policies, but the tablet is not primaryEligible")
 		}
 		return tm.MysqlDaemon.SetSemiSyncEnabled(false, false)
 	}
 
-	if !semiSync {
+	if semiSync != SemiSyncActionTrue {
 		log.Error("invalid configuration - enabling semi sync even though not specified by durability policies. Possibly in the process of upgrading.")
 	}
 	// Always enable replica-side since it doesn't hurt to keep it on for a primary.
@@ -883,7 +883,7 @@ func (tm *TabletManager) fixSemiSync(tabletType topodatapb.TabletType, semiSync
 	return tm.MysqlDaemon.SetSemiSyncEnabled(tabletType == topodatapb.TabletType_PRIMARY, true)
 }
 
-func (tm *TabletManager) fixSemiSyncAndReplication(tabletType topodatapb.TabletType, semiSync bool) error {
+func (tm *TabletManager) fixSemiSyncAndReplication(tabletType topodatapb.TabletType, semiSync SemiSyncAction) error {
 	if !*enableSemiSync {
 		// Semi-sync handling is not enabled.
 		return nil

From d93d77f844c1ba87ce454d959358e60c47fbced4 Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Mon, 17 Jan 2022 10:54:52 +0530
Subject: [PATCH 05/30] feat: change InitReplica rpc to allow passing in
 semiSync as a parameter

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 go/test/fuzzing/vttablet_fuzzer.go            |   2 +-
 .../tabletmanagerdata/tabletmanagerdata.pb.go | 209 +++++++++---------
 .../tabletmanagerdata_vtproto.pb.go           |  33 +++
 go/vt/vtcombo/tablet_map.go                   |   2 +-
 go/vt/vtctl/grpcvtctldserver/server.go        |   2 +-
 go/vt/vttablet/faketmclient/fake_client.go    |   2 +-
 go/vt/vttablet/grpctmclient/client.go         |   3 +-
 go/vt/vttablet/grpctmserver/server.go         |   2 +-
 go/vt/vttablet/tabletmanager/rpc_agent.go     |   2 +-
 .../vttablet/tabletmanager/rpc_replication.go |   4 +-
 go/vt/vttablet/tmclient/rpc_client_api.go     |   2 +-
 go/vt/vttablet/tmrpctest/test_tm_rpc.go       |   6 +-
 proto/tabletmanagerdata.proto                 |   1 +
 web/vtadmin/src/proto/vtadmin.d.ts            |   6 +
 web/vtadmin/src/proto/vtadmin.js              |  22 ++
 15 files changed, 185 insertions(+), 113 deletions(-)

diff --git a/go/test/fuzzing/vttablet_fuzzer.go b/go/test/fuzzing/vttablet_fuzzer.go
index 96c3cfc36df..8be0062e28b 100644
--- a/go/test/fuzzing/vttablet_fuzzer.go
+++ b/go/test/fuzzing/vttablet_fuzzer.go
@@ -585,7 +585,7 @@ func (fs *fuzzStore) callInitReplica() error {
 	if err != nil {
 		return err
 	}
-	_ = fs.client.InitReplica(context.Background(), tablet, parent, replicationPosition, int64(timeCreatedNS))
+	_ = fs.client.InitReplica(context.Background(), tablet, parent, replicationPosition, int64(timeCreatedNS), false)
 	return nil
 }
 
diff --git a/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go b/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go
index 7bea4dc288b..5d38d78f192 100644
--- a/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go
+++ b/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go
@@ -3617,6 +3617,7 @@ type InitReplicaRequest struct {
 	Parent              *topodata.TabletAlias `protobuf:"bytes,1,opt,name=parent,proto3" json:"parent,omitempty"`
 	ReplicationPosition string                `protobuf:"bytes,2,opt,name=replication_position,json=replicationPosition,proto3" json:"replication_position,omitempty"`
 	TimeCreatedNs       int64                 `protobuf:"varint,3,opt,name=time_created_ns,json=timeCreatedNs,proto3" json:"time_created_ns,omitempty"`
+	SemiSync            bool                  `protobuf:"varint,4,opt,name=semiSync,proto3" json:"semiSync,omitempty"`
 }
 
 func (x *InitReplicaRequest) Reset() {
@@ -3672,6 +3673,13 @@ func (x *InitReplicaRequest) GetTimeCreatedNs() int64 {
 	return 0
 }
 
+func (x *InitReplicaRequest) GetSemiSync() bool {
+	if x != nil {
+		return x.SemiSync
+	}
+	return false
+}
+
 type InitReplicaResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -5013,7 +5021,7 @@ var file_tabletmanagerdata_proto_rawDesc = []byte{
 	0x61, 0x74, 0x69, 0x6f, 0x6e, 0x50, 0x6f, 0x73, 0x69, 0x74, 0x69, 0x6f, 0x6e, 0x22, 0x21, 0x0a,
 	0x1f, 0x50, 0x6f, 0x70, 0x75, 0x6c, 0x61, 0x74, 0x65, 0x52, 0x65, 0x70, 0x61, 0x72, 0x65, 0x6e,
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+	0x22, 0xba, 0x01, 0x0a, 0x12, 0x49, 0x6e, 0x69, 0x74, 0x52, 0x65, 0x70, 0x6c, 0x69, 0x63, 0x61,
 	0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x2d, 0x0a, 0x06, 0x70, 0x61, 0x72, 0x65, 0x6e,
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@@ -5023,105 +5031,106 @@ var file_tabletmanagerdata_proto_rawDesc = []byte{
 	0x6e, 0x50, 0x6f, 0x73, 0x69, 0x74, 0x69, 0x6f, 0x6e, 0x12, 0x26, 0x0a, 0x0f, 0x74, 0x69, 0x6d,
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+	0x65, 0x73, 0x74, 0x6f, 0x72, 0x65, 0x46, 0x72, 0x6f, 0x6d, 0x42, 0x61, 0x63, 0x6b, 0x75, 0x70,
+	0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x2d, 0x0a, 0x0b, 0x62, 0x61, 0x63, 0x6b, 0x75,
+	0x70, 0x5f, 0x74, 0x69, 0x6d, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x0c, 0x2e, 0x76,
+	0x74, 0x74, 0x69, 0x6d, 0x65, 0x2e, 0x54, 0x69, 0x6d, 0x65, 0x52, 0x0a, 0x62, 0x61, 0x63, 0x6b,
+	0x75, 0x70, 0x54, 0x69, 0x6d, 0x65, 0x22, 0x41, 0x0a, 0x19, 0x52, 0x65, 0x73, 0x74, 0x6f, 0x72,
+	0x65, 0x46, 0x72, 0x6f, 0x6d, 0x42, 0x61, 0x63, 0x6b, 0x75, 0x70, 0x52, 0x65, 0x73, 0x70, 0x6f,
+	0x6e, 0x73, 0x65, 0x12, 0x24, 0x0a, 0x05, 0x65, 0x76, 0x65, 0x6e, 0x74, 0x18, 0x01, 0x20, 0x01,
+	0x28, 0x0b, 0x32, 0x0e, 0x2e, 0x6c, 0x6f, 0x67, 0x75, 0x74, 0x69, 0x6c, 0x2e, 0x45, 0x76, 0x65,
+	0x6e, 0x74, 0x52, 0x05, 0x65, 0x76, 0x65, 0x6e, 0x74, 0x22, 0x5c, 0x0a, 0x0c, 0x56, 0x45, 0x78,
+	0x65, 0x63, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x14, 0x0a, 0x05, 0x71, 0x75, 0x65,
+	0x72, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x05, 0x71, 0x75, 0x65, 0x72, 0x79, 0x12,
+	0x1a, 0x0a, 0x08, 0x77, 0x6f, 0x72, 0x6b, 0x66, 0x6c, 0x6f, 0x77, 0x18, 0x02, 0x20, 0x01, 0x28,
+	0x09, 0x52, 0x08, 0x77, 0x6f, 0x72, 0x6b, 0x66, 0x6c, 0x6f, 0x77, 0x12, 0x1a, 0x0a, 0x08, 0x6b,
+	0x65, 0x79, 0x73, 0x70, 0x61, 0x63, 0x65, 0x18, 0x03, 0x20, 0x01, 0x28, 0x09, 0x52, 0x08, 0x6b,
+	0x65, 0x79, 0x73, 0x70, 0x61, 0x63, 0x65, 0x22, 0x3b, 0x0a, 0x0d, 0x56, 0x45, 0x78, 0x65, 0x63,
+	0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x12, 0x2a, 0x0a, 0x06, 0x72, 0x65, 0x73, 0x75,
+	0x6c, 0x74, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x12, 0x2e, 0x71, 0x75, 0x65, 0x72, 0x79,
+	0x2e, 0x51, 0x75, 0x65, 0x72, 0x79, 0x52, 0x65, 0x73, 0x75, 0x6c, 0x74, 0x52, 0x06, 0x72, 0x65,
+	0x73, 0x75, 0x6c, 0x74, 0x42, 0x30, 0x5a, 0x2e, 0x76, 0x69, 0x74, 0x65, 0x73, 0x73, 0x2e, 0x69,
+	0x6f, 0x2f, 0x76, 0x69, 0x74, 0x65, 0x73, 0x73, 0x2f, 0x67, 0x6f, 0x2f, 0x76, 0x74, 0x2f, 0x70,
+	0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x74, 0x61, 0x62, 0x6c, 0x65, 0x74, 0x6d, 0x61, 0x6e, 0x61, 0x67,
+	0x65, 0x72, 0x64, 0x61, 0x74, 0x61, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go b/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go
index 5fc6d03da1e..48afa2c3f98 100644
--- a/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go
+++ b/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go
@@ -3210,6 +3210,16 @@ func (m *InitReplicaRequest) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
+	if m.SemiSync {
+		i--
+		if m.SemiSync {
+			dAtA[i] = 1
+		} else {
+			dAtA[i] = 0
+		}
+		i--
+		dAtA[i] = 0x20
+	}
 	if m.TimeCreatedNs != 0 {
 		i = encodeVarint(dAtA, i, uint64(m.TimeCreatedNs))
 		i--
@@ -5381,6 +5391,9 @@ func (m *InitReplicaRequest) SizeVT() (n int) {
 	if m.TimeCreatedNs != 0 {
 		n += 1 + sov(uint64(m.TimeCreatedNs))
 	}
+	if m.SemiSync {
+		n += 2
+	}
 	if m.unknownFields != nil {
 		n += len(m.unknownFields)
 	}
@@ -12478,6 +12491,26 @@ func (m *InitReplicaRequest) UnmarshalVT(dAtA []byte) error {
 					break
 				}
 			}
+		case 4:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field SemiSync", wireType)
+			}
+			var v int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				v |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			m.SemiSync = bool(v != 0)
 		default:
 			iNdEx = preIndex
 			skippy, err := skip(dAtA[iNdEx:])
diff --git a/go/vt/vtcombo/tablet_map.go b/go/vt/vtcombo/tablet_map.go
index cd2c59b2f1f..c7626c817c1 100644
--- a/go/vt/vtcombo/tablet_map.go
+++ b/go/vt/vtcombo/tablet_map.go
@@ -1008,7 +1008,7 @@ func (itmc *internalTabletManagerClient) GetReplicas(context.Context, *topodatap
 	return nil, fmt.Errorf("not implemented in vtcombo")
 }
 
-func (itmc *internalTabletManagerClient) InitReplica(context.Context, *topodatapb.Tablet, *topodatapb.TabletAlias, string, int64) error {
+func (itmc *internalTabletManagerClient) InitReplica(context.Context, *topodatapb.Tablet, *topodatapb.TabletAlias, string, int64, bool) error {
 	return fmt.Errorf("not implemented in vtcombo")
 }
 
diff --git a/go/vt/vtctl/grpcvtctldserver/server.go b/go/vt/vtctl/grpcvtctldserver/server.go
index d938f4864ed..40bb1c6c99e 100644
--- a/go/vt/vtctl/grpcvtctldserver/server.go
+++ b/go/vt/vtctl/grpcvtctldserver/server.go
@@ -1504,7 +1504,7 @@ func (s *VtctldServer) InitShardPrimaryLocked(
 			go func(alias string, tabletInfo *topo.TabletInfo) {
 				defer wgReplicas.Done()
 				logger.Infof("initializing replica %v", alias)
-				if err := tmc.InitReplica(replCtx, tabletInfo.Tablet, req.PrimaryElectTabletAlias, rp, now); err != nil {
+				if err := tmc.InitReplica(replCtx, tabletInfo.Tablet, req.PrimaryElectTabletAlias, rp, now, reparentutil.ReplicaSemiSync(primaryElectTabletInfo.Tablet, tabletInfo.Tablet)); err != nil {
 					rec.RecordError(fmt.Errorf("tablet %v InitReplica failed: %v", alias, err))
 				}
 			}(alias, tabletInfo)
diff --git a/go/vt/vttablet/faketmclient/fake_client.go b/go/vt/vttablet/faketmclient/fake_client.go
index 8838a1848cf..7224be7d483 100644
--- a/go/vt/vttablet/faketmclient/fake_client.go
+++ b/go/vt/vttablet/faketmclient/fake_client.go
@@ -217,7 +217,7 @@ func (client *FakeTabletManagerClient) GetReplicas(ctx context.Context, tablet *
 }
 
 // InitReplica is part of the tmclient.TabletManagerClient interface.
-func (client *FakeTabletManagerClient) InitReplica(ctx context.Context, tablet *topodatapb.Tablet, parent *topodatapb.TabletAlias, replicationPosition string, timeCreatedNS int64) error {
+func (client *FakeTabletManagerClient) InitReplica(ctx context.Context, tablet *topodatapb.Tablet, parent *topodatapb.TabletAlias, replicationPosition string, timeCreatedNS int64, semiSync bool) error {
 	return nil
 }
 
diff --git a/go/vt/vttablet/grpctmclient/client.go b/go/vt/vttablet/grpctmclient/client.go
index c7b67541fc6..a18a4d616b6 100644
--- a/go/vt/vttablet/grpctmclient/client.go
+++ b/go/vt/vttablet/grpctmclient/client.go
@@ -777,7 +777,7 @@ func (client *Client) PopulateReparentJournal(ctx context.Context, tablet *topod
 }
 
 // InitReplica is part of the tmclient.TabletManagerClient interface.
-func (client *Client) InitReplica(ctx context.Context, tablet *topodatapb.Tablet, parent *topodatapb.TabletAlias, replicationPosition string, timeCreatedNS int64) error {
+func (client *Client) InitReplica(ctx context.Context, tablet *topodatapb.Tablet, parent *topodatapb.TabletAlias, replicationPosition string, timeCreatedNS int64, semiSync bool) error {
 	c, closer, err := client.dialer.dial(ctx, tablet)
 	if err != nil {
 		return err
@@ -787,6 +787,7 @@ func (client *Client) InitReplica(ctx context.Context, tablet *topodatapb.Tablet
 		Parent:              parent,
 		ReplicationPosition: replicationPosition,
 		TimeCreatedNs:       timeCreatedNS,
+		SemiSync:            semiSync,
 	})
 	return err
 }
diff --git a/go/vt/vttablet/grpctmserver/server.go b/go/vt/vttablet/grpctmserver/server.go
index a8cc0c3a684..f41669986cf 100644
--- a/go/vt/vttablet/grpctmserver/server.go
+++ b/go/vt/vttablet/grpctmserver/server.go
@@ -420,7 +420,7 @@ func (s *server) InitReplica(ctx context.Context, request *tabletmanagerdatapb.I
 	defer s.tm.HandleRPCPanic(ctx, "InitReplica", request, response, true /*verbose*/, &err)
 	ctx = callinfo.GRPCCallInfo(ctx)
 	response = &tabletmanagerdatapb.InitReplicaResponse{}
-	return response, s.tm.InitReplica(ctx, request.Parent, request.ReplicationPosition, request.TimeCreatedNs)
+	return response, s.tm.InitReplica(ctx, request.Parent, request.ReplicationPosition, request.TimeCreatedNs, request.GetSemiSync())
 }
 
 func (s *server) DemoteMaster(ctx context.Context, request *tabletmanagerdatapb.DemotePrimaryRequest) (response *tabletmanagerdatapb.DemotePrimaryResponse, err error) {
diff --git a/go/vt/vttablet/tabletmanager/rpc_agent.go b/go/vt/vttablet/tabletmanager/rpc_agent.go
index 7cad70b295e..acac5992883 100644
--- a/go/vt/vttablet/tabletmanager/rpc_agent.go
+++ b/go/vt/vttablet/tabletmanager/rpc_agent.go
@@ -120,7 +120,7 @@ type RPCTM interface {
 
 	PopulateReparentJournal(ctx context.Context, timeCreatedNS int64, actionName string, tabletAlias *topodatapb.TabletAlias, pos string) error
 
-	InitReplica(ctx context.Context, parent *topodatapb.TabletAlias, replicationPosition string, timeCreatedNS int64) error
+	InitReplica(ctx context.Context, parent *topodatapb.TabletAlias, replicationPosition string, timeCreatedNS int64, semiSync bool) error
 
 	// Deprecated, use DemotePrimary instead
 	DemoteMaster(ctx context.Context) (*replicationdatapb.PrimaryStatus, error)
diff --git a/go/vt/vttablet/tabletmanager/rpc_replication.go b/go/vt/vttablet/tabletmanager/rpc_replication.go
index c697f84e4ec..361b3a19b45 100644
--- a/go/vt/vttablet/tabletmanager/rpc_replication.go
+++ b/go/vt/vttablet/tabletmanager/rpc_replication.go
@@ -309,7 +309,7 @@ func (tm *TabletManager) PopulateReparentJournal(ctx context.Context, timeCreate
 
 // InitReplica sets replication primary and position, and waits for the
 // reparent_journal table entry up to context timeout
-func (tm *TabletManager) InitReplica(ctx context.Context, parent *topodatapb.TabletAlias, position string, timeCreatedNS int64) error {
+func (tm *TabletManager) InitReplica(ctx context.Context, parent *topodatapb.TabletAlias, position string, timeCreatedNS int64, semiSync bool) error {
 	log.Infof("InitReplica: parent: %v  position: %v", parent, position)
 	if err := tm.lock(ctx); err != nil {
 		return err
@@ -343,7 +343,7 @@ func (tm *TabletManager) InitReplica(ctx context.Context, parent *topodatapb.Tab
 	if tt == topodatapb.TabletType_PRIMARY {
 		tt = topodatapb.TabletType_REPLICA
 	}
-	if err := tm.fixSemiSync(tt, SemiSyncActionFalse); err != nil {
+	if err := tm.fixSemiSync(tt, convertBoolToSemiSyncAction(semiSync)); err != nil {
 		return err
 	}
 
diff --git a/go/vt/vttablet/tmclient/rpc_client_api.go b/go/vt/vttablet/tmclient/rpc_client_api.go
index 6156573496e..1f98b0ac183 100644
--- a/go/vt/vttablet/tmclient/rpc_client_api.go
+++ b/go/vt/vttablet/tmclient/rpc_client_api.go
@@ -179,7 +179,7 @@ type TabletManagerClient interface {
 	// InitReplica tells a tablet to start replicating from the
 	// passed in primary tablet alias, and wait for the row in the
 	// reparent_journal table.
-	InitReplica(ctx context.Context, tablet *topodatapb.Tablet, parent *topodatapb.TabletAlias, replicationPosition string, timeCreatedNS int64) error
+	InitReplica(ctx context.Context, tablet *topodatapb.Tablet, parent *topodatapb.TabletAlias, replicationPosition string, timeCreatedNS int64, semiSync bool) error
 
 	// Deprecated DemoteMaster tells the soon-to-be-former primary it's going to change,
 	// and it should go read-only and return its current position.
diff --git a/go/vt/vttablet/tmrpctest/test_tm_rpc.go b/go/vt/vttablet/tmrpctest/test_tm_rpc.go
index 6c45e7c0e2a..2156b2ee059 100644
--- a/go/vt/vttablet/tmrpctest/test_tm_rpc.go
+++ b/go/vt/vttablet/tmrpctest/test_tm_rpc.go
@@ -1008,7 +1008,7 @@ func tmRPCTestPopulateReparentJournalPanic(ctx context.Context, t *testing.T, cl
 
 var testInitReplicaCalled = false
 
-func (fra *fakeRPCTM) InitReplica(ctx context.Context, parent *topodatapb.TabletAlias, position string, timeCreatedNS int64) error {
+func (fra *fakeRPCTM) InitReplica(ctx context.Context, parent *topodatapb.TabletAlias, position string, timeCreatedNS int64, semiSync bool) error {
 	if fra.panics {
 		panic(fmt.Errorf("test-triggered panic"))
 	}
@@ -1020,12 +1020,12 @@ func (fra *fakeRPCTM) InitReplica(ctx context.Context, parent *topodatapb.Tablet
 }
 
 func tmRPCTestInitReplica(ctx context.Context, t *testing.T, client tmclient.TabletManagerClient, tablet *topodatapb.Tablet) {
-	err := client.InitReplica(ctx, tablet, testPrimaryAlias, testReplicationPosition, testTimeCreatedNS)
+	err := client.InitReplica(ctx, tablet, testPrimaryAlias, testReplicationPosition, testTimeCreatedNS, false)
 	compareError(t, "InitReplica", err, true, testInitReplicaCalled)
 }
 
 func tmRPCTestInitReplicaPanic(ctx context.Context, t *testing.T, client tmclient.TabletManagerClient, tablet *topodatapb.Tablet) {
-	err := client.InitReplica(ctx, tablet, testPrimaryAlias, testReplicationPosition, testTimeCreatedNS)
+	err := client.InitReplica(ctx, tablet, testPrimaryAlias, testReplicationPosition, testTimeCreatedNS, false)
 	expectHandleRPCPanic(t, "InitReplica", true /*verbose*/, err)
 }
 
diff --git a/proto/tabletmanagerdata.proto b/proto/tabletmanagerdata.proto
index c2f44c266cc..6dce762a4ad 100644
--- a/proto/tabletmanagerdata.proto
+++ b/proto/tabletmanagerdata.proto
@@ -379,6 +379,7 @@ message InitReplicaRequest {
   topodata.TabletAlias parent = 1;
   string replication_position = 2;
   int64 time_created_ns = 3;
+  bool semiSync = 4;
 }
 
 message InitReplicaResponse {
diff --git a/web/vtadmin/src/proto/vtadmin.d.ts b/web/vtadmin/src/proto/vtadmin.d.ts
index 32ee267d60f..3daca4c8e53 100644
--- a/web/vtadmin/src/proto/vtadmin.d.ts
+++ b/web/vtadmin/src/proto/vtadmin.d.ts
@@ -17113,6 +17113,9 @@ export namespace tabletmanagerdata {
 
         /** InitReplicaRequest time_created_ns */
         time_created_ns?: (number|Long|null);
+
+        /** InitReplicaRequest semiSync */
+        semiSync?: (boolean|null);
     }
 
     /** Represents an InitReplicaRequest. */
@@ -17133,6 +17136,9 @@ export namespace tabletmanagerdata {
         /** InitReplicaRequest time_created_ns. */
         public time_created_ns: (number|Long);
 
+        /** InitReplicaRequest semiSync. */
+        public semiSync: boolean;
+
         /**
          * Creates a new InitReplicaRequest instance using the specified properties.
          * @param [properties] Properties to set
diff --git a/web/vtadmin/src/proto/vtadmin.js b/web/vtadmin/src/proto/vtadmin.js
index cc370ee9d8c..c1c0b0c9236 100644
--- a/web/vtadmin/src/proto/vtadmin.js
+++ b/web/vtadmin/src/proto/vtadmin.js
@@ -38820,6 +38820,7 @@ $root.tabletmanagerdata = (function() {
          * @property {topodata.ITabletAlias|null} [parent] InitReplicaRequest parent
          * @property {string|null} [replication_position] InitReplicaRequest replication_position
          * @property {number|Long|null} [time_created_ns] InitReplicaRequest time_created_ns
+         * @property {boolean|null} [semiSync] InitReplicaRequest semiSync
          */
 
         /**
@@ -38861,6 +38862,14 @@ $root.tabletmanagerdata = (function() {
          */
         InitReplicaRequest.prototype.time_created_ns = $util.Long ? $util.Long.fromBits(0,0,false) : 0;
 
+        /**
+         * InitReplicaRequest semiSync.
+         * @member {boolean} semiSync
+         * @memberof tabletmanagerdata.InitReplicaRequest
+         * @instance
+         */
+        InitReplicaRequest.prototype.semiSync = false;
+
         /**
          * Creates a new InitReplicaRequest instance using the specified properties.
          * @function create
@@ -38891,6 +38900,8 @@ $root.tabletmanagerdata = (function() {
                 writer.uint32(/* id 2, wireType 2 =*/18).string(message.replication_position);
             if (message.time_created_ns != null && Object.hasOwnProperty.call(message, "time_created_ns"))
                 writer.uint32(/* id 3, wireType 0 =*/24).int64(message.time_created_ns);
+            if (message.semiSync != null && Object.hasOwnProperty.call(message, "semiSync"))
+                writer.uint32(/* id 4, wireType 0 =*/32).bool(message.semiSync);
             return writer;
         };
 
@@ -38934,6 +38945,9 @@ $root.tabletmanagerdata = (function() {
                 case 3:
                     message.time_created_ns = reader.int64();
                     break;
+                case 4:
+                    message.semiSync = reader.bool();
+                    break;
                 default:
                     reader.skipType(tag & 7);
                     break;
@@ -38980,6 +38994,9 @@ $root.tabletmanagerdata = (function() {
             if (message.time_created_ns != null && message.hasOwnProperty("time_created_ns"))
                 if (!$util.isInteger(message.time_created_ns) && !(message.time_created_ns && $util.isInteger(message.time_created_ns.low) && $util.isInteger(message.time_created_ns.high)))
                     return "time_created_ns: integer|Long expected";
+            if (message.semiSync != null && message.hasOwnProperty("semiSync"))
+                if (typeof message.semiSync !== "boolean")
+                    return "semiSync: boolean expected";
             return null;
         };
 
@@ -39011,6 +39028,8 @@ $root.tabletmanagerdata = (function() {
                     message.time_created_ns = object.time_created_ns;
                 else if (typeof object.time_created_ns === "object")
                     message.time_created_ns = new $util.LongBits(object.time_created_ns.low >>> 0, object.time_created_ns.high >>> 0).toNumber();
+            if (object.semiSync != null)
+                message.semiSync = Boolean(object.semiSync);
             return message;
         };
 
@@ -39035,6 +39054,7 @@ $root.tabletmanagerdata = (function() {
                     object.time_created_ns = options.longs === String ? long.toString() : options.longs === Number ? long.toNumber() : long;
                 } else
                     object.time_created_ns = options.longs === String ? "0" : 0;
+                object.semiSync = false;
             }
             if (message.parent != null && message.hasOwnProperty("parent"))
                 object.parent = $root.topodata.TabletAlias.toObject(message.parent, options);
@@ -39045,6 +39065,8 @@ $root.tabletmanagerdata = (function() {
                     object.time_created_ns = options.longs === String ? String(message.time_created_ns) : message.time_created_ns;
                 else
                     object.time_created_ns = options.longs === String ? $util.Long.prototype.toString.call(message.time_created_ns) : options.longs === Number ? new $util.LongBits(message.time_created_ns.low >>> 0, message.time_created_ns.high >>> 0).toNumber() : message.time_created_ns;
+            if (message.semiSync != null && message.hasOwnProperty("semiSync"))
+                object.semiSync = message.semiSync;
             return object;
         };
 

From 0ba29a5247c9e34ae2fea3f44b61c07e302e6924 Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Mon, 17 Jan 2022 11:27:20 +0530
Subject: [PATCH 06/30] feat: change InitPrimary rpc to allow passing in
 semiSync as a parameter

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 go/test/fuzzing/vttablet_fuzzer.go            |   2 +-
 .../tabletmanagerdata/tabletmanagerdata.pb.go | 271 +++++++++---------
 .../tabletmanagerdata_vtproto.pb.go           |  33 +++
 go/vt/vtcombo/tablet_map.go                   |   4 +-
 go/vt/vtctl/grpcvtctldserver/server.go        |   2 +-
 .../testutil/test_tmclient.go                 |   2 +-
 .../vtctl/reparentutil/planned_reparenter.go  |   2 +-
 go/vt/vttablet/faketmclient/fake_client.go    |   4 +-
 go/vt/vttablet/grpctmclient/client.go         |  12 +-
 go/vt/vttablet/grpctmserver/server.go         |   4 +-
 go/vt/vttablet/tabletmanager/rpc_agent.go     |   4 +-
 .../vttablet/tabletmanager/rpc_replication.go |   8 +-
 go/vt/vttablet/tmclient/rpc_client_api.go     |   4 +-
 go/vt/vttablet/tmrpctest/test_tm_rpc.go       |   8 +-
 proto/tabletmanagerdata.proto                 |   1 +
 web/vtadmin/src/proto/vtadmin.d.ts            |   6 +
 web/vtadmin/src/proto/vtadmin.js              |  33 ++-
 17 files changed, 241 insertions(+), 159 deletions(-)

diff --git a/go/test/fuzzing/vttablet_fuzzer.go b/go/test/fuzzing/vttablet_fuzzer.go
index 8be0062e28b..ede5ea965d9 100644
--- a/go/test/fuzzing/vttablet_fuzzer.go
+++ b/go/test/fuzzing/vttablet_fuzzer.go
@@ -298,7 +298,7 @@ func (fs *fuzzStore) callInitMaster() error {
 	if err != nil {
 		return err
 	}
-	_, _ = fs.client.InitMaster(context.Background(), tablet)
+	_, _ = fs.client.InitMaster(context.Background(), tablet, false)
 	return nil
 }
 
diff --git a/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go b/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go
index 5d38d78f192..bb3ab3b4242 100644
--- a/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go
+++ b/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go
@@ -3419,6 +3419,8 @@ type InitPrimaryRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
+
+	SemiSync bool `protobuf:"varint,1,opt,name=semiSync,proto3" json:"semiSync,omitempty"`
 }
 
 func (x *InitPrimaryRequest) Reset() {
@@ -3453,6 +3455,13 @@ func (*InitPrimaryRequest) Descriptor() ([]byte, []int) {
 	return file_tabletmanagerdata_proto_rawDescGZIP(), []int{70}
 }
 
+func (x *InitPrimaryRequest) GetSemiSync() bool {
+	if x != nil {
+		return x.SemiSync
+	}
+	return false
+}
+
 type InitPrimaryResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -5000,137 +5009,139 @@ var file_tabletmanagerdata_proto_rawDesc = []byte{
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+	0x20, 0x01, 0x28, 0x0b, 0x32, 0x12, 0x2e, 0x71, 0x75, 0x65, 0x72, 0x79, 0x2e, 0x51, 0x75, 0x65,
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+	0x42, 0x30, 0x5a, 0x2e, 0x76, 0x69, 0x74, 0x65, 0x73, 0x73, 0x2e, 0x69, 0x6f, 0x2f, 0x76, 0x69,
+	0x74, 0x65, 0x73, 0x73, 0x2f, 0x67, 0x6f, 0x2f, 0x76, 0x74, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f,
+	0x2f, 0x74, 0x61, 0x62, 0x6c, 0x65, 0x74, 0x6d, 0x61, 0x6e, 0x61, 0x67, 0x65, 0x72, 0x64, 0x61,
+	0x74, 0x61, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go b/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go
index 48afa2c3f98..4c4fd7e0511 100644
--- a/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go
+++ b/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go
@@ -3042,6 +3042,16 @@ func (m *InitPrimaryRequest) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
+	if m.SemiSync {
+		i--
+		if m.SemiSync {
+			dAtA[i] = 1
+		} else {
+			dAtA[i] = 0
+		}
+		i--
+		dAtA[i] = 0x8
+	}
 	return len(dAtA) - i, nil
 }
 
@@ -5313,6 +5323,9 @@ func (m *InitPrimaryRequest) SizeVT() (n int) {
 	}
 	var l int
 	_ = l
+	if m.SemiSync {
+		n += 2
+	}
 	if m.unknownFields != nil {
 		n += len(m.unknownFields)
 	}
@@ -12049,6 +12062,26 @@ func (m *InitPrimaryRequest) UnmarshalVT(dAtA []byte) error {
 			return fmt.Errorf("proto: InitPrimaryRequest: illegal tag %d (wire type %d)", fieldNum, wire)
 		}
 		switch fieldNum {
+		case 1:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field SemiSync", wireType)
+			}
+			var v int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				v |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			m.SemiSync = bool(v != 0)
 		default:
 			iNdEx = preIndex
 			skippy, err := skip(dAtA[iNdEx:])
diff --git a/go/vt/vtcombo/tablet_map.go b/go/vt/vtcombo/tablet_map.go
index c7626c817c1..e8214913456 100644
--- a/go/vt/vtcombo/tablet_map.go
+++ b/go/vt/vtcombo/tablet_map.go
@@ -929,11 +929,11 @@ func (itmc *internalTabletManagerClient) ResetReplication(context.Context, *topo
 	return fmt.Errorf("not implemented in vtcombo")
 }
 
-func (itmc *internalTabletManagerClient) InitMaster(context.Context, *topodatapb.Tablet) (string, error) {
+func (itmc *internalTabletManagerClient) InitMaster(context.Context, *topodatapb.Tablet, bool) (string, error) {
 	return "", fmt.Errorf("not implemented in vtcombo")
 }
 
-func (itmc *internalTabletManagerClient) InitPrimary(context.Context, *topodatapb.Tablet) (string, error) {
+func (itmc *internalTabletManagerClient) InitPrimary(context.Context, *topodatapb.Tablet, bool) (string, error) {
 	return "", fmt.Errorf("not implemented in vtcombo")
 }
 
diff --git a/go/vt/vtctl/grpcvtctldserver/server.go b/go/vt/vtctl/grpcvtctldserver/server.go
index 40bb1c6c99e..941a779ee5f 100644
--- a/go/vt/vtctl/grpcvtctldserver/server.go
+++ b/go/vt/vtctl/grpcvtctldserver/server.go
@@ -1463,7 +1463,7 @@ func (s *VtctldServer) InitShardPrimaryLocked(
 	// position
 	logger.Infof("initializing primary on %v", topoproto.TabletAliasString(req.PrimaryElectTabletAlias))
 	event.DispatchUpdate(ev, "initializing primary")
-	rp, err := tmc.InitPrimary(ctx, primaryElectTabletInfo.Tablet)
+	rp, err := tmc.InitPrimary(ctx, primaryElectTabletInfo.Tablet, reparentutil.SemiSyncAckers(primaryElectTabletInfo.Tablet) > 0)
 	if err != nil {
 		return err
 	}
diff --git a/go/vt/vtctl/grpcvtctldserver/testutil/test_tmclient.go b/go/vt/vtctl/grpcvtctldserver/testutil/test_tmclient.go
index 8f183aabeca..f4a80fcf185 100644
--- a/go/vt/vtctl/grpcvtctldserver/testutil/test_tmclient.go
+++ b/go/vt/vtctl/grpcvtctldserver/testutil/test_tmclient.go
@@ -495,7 +495,7 @@ func (fake *TabletManagerClient) PromoteReplica(ctx context.Context, tablet *top
 }
 
 // InitPrimary is part of the tmclient.TabletManagerClient interface.
-func (fake *TabletManagerClient) InitPrimary(ctx context.Context, tablet *topodatapb.Tablet) (string, error) {
+func (fake *TabletManagerClient) InitPrimary(ctx context.Context, tablet *topodatapb.Tablet, semiSync bool) (string, error) {
 	if fake.InitPrimaryResults == nil {
 		return "", assert.AnError
 	}
diff --git a/go/vt/vtctl/reparentutil/planned_reparenter.go b/go/vt/vtctl/reparentutil/planned_reparenter.go
index 578126cc36c..1339a0cfae4 100644
--- a/go/vt/vtctl/reparentutil/planned_reparenter.go
+++ b/go/vt/vtctl/reparentutil/planned_reparenter.go
@@ -319,7 +319,7 @@ func (pr *PlannedReparenter) performInitialPromotion(
 	// This is done to guarantee safety, in the sense that the semi-sync is on before we start accepting writes.
 	// However, during initialization, it is likely that the database would not be created in the MySQL instance.
 	// Therefore, we have to first set read-write mode, create the database and then fix semi-sync, otherwise we get blocked.
-	rp, err := pr.tmc.InitPrimary(promoteCtx, primaryElect)
+	rp, err := pr.tmc.InitPrimary(promoteCtx, primaryElect, SemiSyncAckers(primaryElect) > 0)
 	if err != nil {
 		return "", vterrors.Wrapf(err, "primary-elect tablet %v failed to be promoted to primary; please try again", primaryElectAliasStr)
 	}
diff --git a/go/vt/vttablet/faketmclient/fake_client.go b/go/vt/vttablet/faketmclient/fake_client.go
index 7224be7d483..aea6a475a5e 100644
--- a/go/vt/vttablet/faketmclient/fake_client.go
+++ b/go/vt/vttablet/faketmclient/fake_client.go
@@ -281,12 +281,12 @@ func (client *FakeTabletManagerClient) ResetReplication(ctx context.Context, tab
 }
 
 // InitMaster is part of the tmclient.TabletManagerClient interface.
-func (client *FakeTabletManagerClient) InitMaster(ctx context.Context, tablet *topodatapb.Tablet) (string, error) {
+func (client *FakeTabletManagerClient) InitMaster(ctx context.Context, tablet *topodatapb.Tablet, semiSync bool) (string, error) {
 	return "", nil
 }
 
 // InitPrimary is part of the tmclient.TabletManagerClient interface.
-func (client *FakeTabletManagerClient) InitPrimary(ctx context.Context, tablet *topodatapb.Tablet) (string, error) {
+func (client *FakeTabletManagerClient) InitPrimary(ctx context.Context, tablet *topodatapb.Tablet, semiSync bool) (string, error) {
 	return "", nil
 }
 
diff --git a/go/vt/vttablet/grpctmclient/client.go b/go/vt/vttablet/grpctmclient/client.go
index a18a4d616b6..8e844d17f3b 100644
--- a/go/vt/vttablet/grpctmclient/client.go
+++ b/go/vt/vttablet/grpctmclient/client.go
@@ -731,14 +731,16 @@ func (client *Client) ResetReplication(ctx context.Context, tablet *topodatapb.T
 }
 
 // InitMaster is part of the tmclient.TabletManagerClient interface.
-func (client *Client) InitMaster(ctx context.Context, tablet *topodatapb.Tablet) (string, error) {
+func (client *Client) InitMaster(ctx context.Context, tablet *topodatapb.Tablet, semiSync bool) (string, error) {
 	c, closer, err := client.dialer.dial(ctx, tablet)
 	if err != nil {
 		return "", err
 	}
 	defer closer.Close()
 
-	response, err := c.InitMaster(ctx, &tabletmanagerdatapb.InitPrimaryRequest{})
+	response, err := c.InitMaster(ctx, &tabletmanagerdatapb.InitPrimaryRequest{
+		SemiSync: semiSync,
+	})
 	if err != nil {
 		return "", err
 	}
@@ -746,14 +748,16 @@ func (client *Client) InitMaster(ctx context.Context, tablet *topodatapb.Tablet)
 }
 
 // InitPrimary is part of the tmclient.TabletManagerClient interface.
-func (client *Client) InitPrimary(ctx context.Context, tablet *topodatapb.Tablet) (string, error) {
+func (client *Client) InitPrimary(ctx context.Context, tablet *topodatapb.Tablet, semiSync bool) (string, error) {
 	c, closer, err := client.dialer.dial(ctx, tablet)
 	if err != nil {
 		return "", err
 	}
 	defer closer.Close()
 
-	response, err := c.InitPrimary(ctx, &tabletmanagerdatapb.InitPrimaryRequest{})
+	response, err := c.InitPrimary(ctx, &tabletmanagerdatapb.InitPrimaryRequest{
+		SemiSync: semiSync,
+	})
 	if err != nil {
 		return "", err
 	}
diff --git a/go/vt/vttablet/grpctmserver/server.go b/go/vt/vttablet/grpctmserver/server.go
index f41669986cf..20b1664ba23 100644
--- a/go/vt/vttablet/grpctmserver/server.go
+++ b/go/vt/vttablet/grpctmserver/server.go
@@ -391,7 +391,7 @@ func (s *server) InitMaster(ctx context.Context, request *tabletmanagerdatapb.In
 	defer s.tm.HandleRPCPanic(ctx, "InitMaster", request, response, true /*verbose*/, &err)
 	ctx = callinfo.GRPCCallInfo(ctx)
 	response = &tabletmanagerdatapb.InitPrimaryResponse{}
-	position, err := s.tm.InitPrimary(ctx)
+	position, err := s.tm.InitPrimary(ctx, request.GetSemiSync())
 	if err == nil {
 		response.Position = position
 	}
@@ -402,7 +402,7 @@ func (s *server) InitPrimary(ctx context.Context, request *tabletmanagerdatapb.I
 	defer s.tm.HandleRPCPanic(ctx, "InitPrimary", request, response, true /*verbose*/, &err)
 	ctx = callinfo.GRPCCallInfo(ctx)
 	response = &tabletmanagerdatapb.InitPrimaryResponse{}
-	position, err := s.tm.InitPrimary(ctx)
+	position, err := s.tm.InitPrimary(ctx, request.GetSemiSync())
 	if err == nil {
 		response.Position = position
 	}
diff --git a/go/vt/vttablet/tabletmanager/rpc_agent.go b/go/vt/vttablet/tabletmanager/rpc_agent.go
index acac5992883..b057de57ae7 100644
--- a/go/vt/vttablet/tabletmanager/rpc_agent.go
+++ b/go/vt/vttablet/tabletmanager/rpc_agent.go
@@ -114,9 +114,9 @@ type RPCTM interface {
 	ResetReplication(ctx context.Context) error
 
 	// Deprecated, use InitPrimary instead
-	InitMaster(ctx context.Context) (string, error)
+	InitMaster(ctx context.Context, semiSync bool) (string, error)
 
-	InitPrimary(ctx context.Context) (string, error)
+	InitPrimary(ctx context.Context, semiSync bool) (string, error)
 
 	PopulateReparentJournal(ctx context.Context, timeCreatedNS int64, actionName string, tabletAlias *topodatapb.TabletAlias, pos string) error
 
diff --git a/go/vt/vttablet/tabletmanager/rpc_replication.go b/go/vt/vttablet/tabletmanager/rpc_replication.go
index 361b3a19b45..4949d1733b2 100644
--- a/go/vt/vttablet/tabletmanager/rpc_replication.go
+++ b/go/vt/vttablet/tabletmanager/rpc_replication.go
@@ -238,12 +238,12 @@ func (tm *TabletManager) ResetReplication(ctx context.Context) error {
 }
 
 // InitMaster is the old version of InitPrimary. Deprecated.
-func (tm *TabletManager) InitMaster(ctx context.Context) (string, error) {
-	return tm.InitPrimary(ctx)
+func (tm *TabletManager) InitMaster(ctx context.Context, semiSync bool) (string, error) {
+	return tm.InitPrimary(ctx, semiSync)
 }
 
 // InitPrimary enables writes and returns the replication position.
-func (tm *TabletManager) InitPrimary(ctx context.Context) (string, error) {
+func (tm *TabletManager) InitPrimary(ctx context.Context, semiSync bool) (string, error) {
 	log.Infof("InitPrimary")
 	if err := tm.lock(ctx); err != nil {
 		return "", err
@@ -279,7 +279,7 @@ func (tm *TabletManager) InitPrimary(ctx context.Context) (string, error) {
 
 	// Enforce semi-sync after changing the tablet)type to PRIMARY. Otherwise, the
 	// primary will hang while trying to create the database.
-	if err := tm.fixSemiSync(topodatapb.TabletType_PRIMARY, SemiSyncActionFalse); err != nil {
+	if err := tm.fixSemiSync(topodatapb.TabletType_PRIMARY, convertBoolToSemiSyncAction(semiSync)); err != nil {
 		return "", err
 	}
 
diff --git a/go/vt/vttablet/tmclient/rpc_client_api.go b/go/vt/vttablet/tmclient/rpc_client_api.go
index 1f98b0ac183..dd8ba2ea7e5 100644
--- a/go/vt/vttablet/tmclient/rpc_client_api.go
+++ b/go/vt/vttablet/tmclient/rpc_client_api.go
@@ -165,12 +165,12 @@ type TabletManagerClient interface {
 	// Deprecated InitMaster tells a tablet to make itself the new primary,
 	// and return the replication position the replicas should use to
 	// reparent to it.
-	InitMaster(ctx context.Context, tablet *topodatapb.Tablet) (string, error)
+	InitMaster(ctx context.Context, tablet *topodatapb.Tablet, semiSync bool) (string, error)
 
 	// InitPrimary tells a tablet to make itself the new primary,
 	// and return the replication position the replicas should use to
 	// reparent to it.
-	InitPrimary(ctx context.Context, tablet *topodatapb.Tablet) (string, error)
+	InitPrimary(ctx context.Context, tablet *topodatapb.Tablet, semiSync bool) (string, error)
 
 	// PopulateReparentJournal asks the primary to insert a row in
 	// its reparent_journal table.
diff --git a/go/vt/vttablet/tmrpctest/test_tm_rpc.go b/go/vt/vttablet/tmrpctest/test_tm_rpc.go
index 2156b2ee059..9cf5208ec76 100644
--- a/go/vt/vttablet/tmrpctest/test_tm_rpc.go
+++ b/go/vt/vttablet/tmrpctest/test_tm_rpc.go
@@ -950,7 +950,7 @@ func tmRPCTestResetReplicationPanic(ctx context.Context, t *testing.T, client tm
 	expectHandleRPCPanic(t, "ResetReplication", true /*verbose*/, err)
 }
 
-func (fra *fakeRPCTM) InitPrimary(ctx context.Context) (string, error) {
+func (fra *fakeRPCTM) InitPrimary(ctx context.Context, semiSync bool) (string, error) {
 	if fra.panics {
 		panic(fmt.Errorf("test-triggered panic"))
 	}
@@ -958,7 +958,7 @@ func (fra *fakeRPCTM) InitPrimary(ctx context.Context) (string, error) {
 }
 
 // Deprecated
-func (fra *fakeRPCTM) InitMaster(ctx context.Context) (string, error) {
+func (fra *fakeRPCTM) InitMaster(ctx context.Context, semiSync bool) (string, error) {
 	if fra.panics {
 		panic(fmt.Errorf("test-triggered panic"))
 	}
@@ -966,12 +966,12 @@ func (fra *fakeRPCTM) InitMaster(ctx context.Context) (string, error) {
 }
 
 func tmRPCTestInitMaster(ctx context.Context, t *testing.T, client tmclient.TabletManagerClient, tablet *topodatapb.Tablet) {
-	rp, err := client.InitMaster(ctx, tablet)
+	rp, err := client.InitMaster(ctx, tablet, false)
 	compareError(t, "InitMaster", err, rp, testReplicationPosition)
 }
 
 func tmRPCTestInitMasterPanic(ctx context.Context, t *testing.T, client tmclient.TabletManagerClient, tablet *topodatapb.Tablet) {
-	_, err := client.InitMaster(ctx, tablet)
+	_, err := client.InitMaster(ctx, tablet, false)
 	expectHandleRPCPanic(t, "InitMaster", true /*verbose*/, err)
 }
 
diff --git a/proto/tabletmanagerdata.proto b/proto/tabletmanagerdata.proto
index 6dce762a4ad..903520455d6 100644
--- a/proto/tabletmanagerdata.proto
+++ b/proto/tabletmanagerdata.proto
@@ -359,6 +359,7 @@ message VReplicationWaitForPosResponse {
 }
 
 message InitPrimaryRequest {
+  bool semiSync = 1;
 }
 
 message InitPrimaryResponse {
diff --git a/web/vtadmin/src/proto/vtadmin.d.ts b/web/vtadmin/src/proto/vtadmin.d.ts
index 3daca4c8e53..dacbbc56fb5 100644
--- a/web/vtadmin/src/proto/vtadmin.d.ts
+++ b/web/vtadmin/src/proto/vtadmin.d.ts
@@ -16738,6 +16738,9 @@ export namespace tabletmanagerdata {
 
     /** Properties of an InitPrimaryRequest. */
     interface IInitPrimaryRequest {
+
+        /** InitPrimaryRequest semiSync */
+        semiSync?: (boolean|null);
     }
 
     /** Represents an InitPrimaryRequest. */
@@ -16749,6 +16752,9 @@ export namespace tabletmanagerdata {
          */
         constructor(properties?: tabletmanagerdata.IInitPrimaryRequest);
 
+        /** InitPrimaryRequest semiSync. */
+        public semiSync: boolean;
+
         /**
          * Creates a new InitPrimaryRequest instance using the specified properties.
          * @param [properties] Properties to set
diff --git a/web/vtadmin/src/proto/vtadmin.js b/web/vtadmin/src/proto/vtadmin.js
index c1c0b0c9236..2c1958ac2fc 100644
--- a/web/vtadmin/src/proto/vtadmin.js
+++ b/web/vtadmin/src/proto/vtadmin.js
@@ -38037,6 +38037,7 @@ $root.tabletmanagerdata = (function() {
          * Properties of an InitPrimaryRequest.
          * @memberof tabletmanagerdata
          * @interface IInitPrimaryRequest
+         * @property {boolean|null} [semiSync] InitPrimaryRequest semiSync
          */
 
         /**
@@ -38054,6 +38055,14 @@ $root.tabletmanagerdata = (function() {
                         this[keys[i]] = properties[keys[i]];
         }
 
+        /**
+         * InitPrimaryRequest semiSync.
+         * @member {boolean} semiSync
+         * @memberof tabletmanagerdata.InitPrimaryRequest
+         * @instance
+         */
+        InitPrimaryRequest.prototype.semiSync = false;
+
         /**
          * Creates a new InitPrimaryRequest instance using the specified properties.
          * @function create
@@ -38078,6 +38087,8 @@ $root.tabletmanagerdata = (function() {
         InitPrimaryRequest.encode = function encode(message, writer) {
             if (!writer)
                 writer = $Writer.create();
+            if (message.semiSync != null && Object.hasOwnProperty.call(message, "semiSync"))
+                writer.uint32(/* id 1, wireType 0 =*/8).bool(message.semiSync);
             return writer;
         };
 
@@ -38112,6 +38123,9 @@ $root.tabletmanagerdata = (function() {
             while (reader.pos < end) {
                 var tag = reader.uint32();
                 switch (tag >>> 3) {
+                case 1:
+                    message.semiSync = reader.bool();
+                    break;
                 default:
                     reader.skipType(tag & 7);
                     break;
@@ -38147,6 +38161,9 @@ $root.tabletmanagerdata = (function() {
         InitPrimaryRequest.verify = function verify(message) {
             if (typeof message !== "object" || message === null)
                 return "object expected";
+            if (message.semiSync != null && message.hasOwnProperty("semiSync"))
+                if (typeof message.semiSync !== "boolean")
+                    return "semiSync: boolean expected";
             return null;
         };
 
@@ -38161,7 +38178,10 @@ $root.tabletmanagerdata = (function() {
         InitPrimaryRequest.fromObject = function fromObject(object) {
             if (object instanceof $root.tabletmanagerdata.InitPrimaryRequest)
                 return object;
-            return new $root.tabletmanagerdata.InitPrimaryRequest();
+            var message = new $root.tabletmanagerdata.InitPrimaryRequest();
+            if (object.semiSync != null)
+                message.semiSync = Boolean(object.semiSync);
+            return message;
         };
 
         /**
@@ -38173,8 +38193,15 @@ $root.tabletmanagerdata = (function() {
          * @param {$protobuf.IConversionOptions} [options] Conversion options
          * @returns {Object.<string,*>} Plain object
          */
-        InitPrimaryRequest.toObject = function toObject() {
-            return {};
+        InitPrimaryRequest.toObject = function toObject(message, options) {
+            if (!options)
+                options = {};
+            var object = {};
+            if (options.defaults)
+                object.semiSync = false;
+            if (message.semiSync != null && message.hasOwnProperty("semiSync"))
+                object.semiSync = message.semiSync;
+            return object;
         };
 
         /**

From f87b857233bc93dc4ebc6ec91dacc8c2cc5c9a1c Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Mon, 17 Jan 2022 13:32:34 +0530
Subject: [PATCH 07/30] feat: fix demotePrimary function to fix primary side
 semi-sync only if enabled

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 .../vttablet/tabletmanager/rpc_replication.go | 29 ++++++++++++-------
 1 file changed, 18 insertions(+), 11 deletions(-)

diff --git a/go/vt/vttablet/tabletmanager/rpc_replication.go b/go/vt/vttablet/tabletmanager/rpc_replication.go
index 4949d1733b2..c9255044b47 100644
--- a/go/vt/vttablet/tabletmanager/rpc_replication.go
+++ b/go/vt/vttablet/tabletmanager/rpc_replication.go
@@ -464,18 +464,20 @@ func (tm *TabletManager) demotePrimary(ctx context.Context, revertPartialFailure
 		}
 	}()
 
-	// If using semi-sync, we need to disable primary-side.
-	if err := tm.fixSemiSync(topodatapb.TabletType_REPLICA, SemiSyncActionFalse); err != nil {
-		return nil, err
-	}
-	defer func() {
-		if finalErr != nil && revertPartialFailure && wasPrimary {
-			// enable primary-side semi-sync again
-			if err := tm.fixSemiSync(topodatapb.TabletType_PRIMARY, SemiSyncActionFalse); err != nil {
-				log.Warningf("fixSemiSync(PRIMARY) failed during revert: %v", err)
-			}
+	if tm.isPrimarySideSemiSyncEnabled() {
+		// If using semi-sync, we need to disable primary-side.
+		if err := tm.fixSemiSync(topodatapb.TabletType_REPLICA, SemiSyncActionFalse); err != nil {
+			return nil, err
 		}
-	}()
+		defer func() {
+			if finalErr != nil && revertPartialFailure && wasPrimary {
+				// enable primary-side semi-sync again
+				if err := tm.fixSemiSync(topodatapb.TabletType_PRIMARY, SemiSyncActionTrue); err != nil {
+					log.Warningf("fixSemiSync(PRIMARY) failed during revert: %v", err)
+				}
+			}
+		}()
+	}
 
 	// Return the current replication position.
 	status, err := tm.MysqlDaemon.PrimaryStatus(ctx)
@@ -883,6 +885,11 @@ func (tm *TabletManager) fixSemiSync(tabletType topodatapb.TabletType, semiSync
 	return tm.MysqlDaemon.SetSemiSyncEnabled(tabletType == topodatapb.TabletType_PRIMARY, true)
 }
 
+func (tm *TabletManager) isPrimarySideSemiSyncEnabled() bool {
+	semiSyncEnabled, _ := tm.MysqlDaemon.SemiSyncEnabled()
+	return semiSyncEnabled
+}
+
 func (tm *TabletManager) fixSemiSyncAndReplication(tabletType topodatapb.TabletType, semiSync SemiSyncAction) error {
 	if !*enableSemiSync {
 		// Semi-sync handling is not enabled.

From 1377080f9dd46c3be887c724630f1606a7fdb10e Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Mon, 17 Jan 2022 15:00:34 +0530
Subject: [PATCH 08/30] feat: change UndoDemotePrimary rpc to allow passing in
 semiSync as a parameter

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 go/test/fuzzing/vttablet_fuzzer.go            |   2 +-
 go/vt/orchestrator/logic/tablet_discovery.go  |   2 +-
 .../tabletmanagerdata/tabletmanagerdata.pb.go | 183 ++++++++++--------
 .../tabletmanagerdata_vtproto.pb.go           |  33 ++++
 go/vt/vtcombo/tablet_map.go                   |   2 +-
 .../testutil/test_tmclient.go                 |   2 +-
 .../vtctl/reparentutil/planned_reparenter.go  |   2 +-
 go/vt/vttablet/faketmclient/fake_client.go    |   2 +-
 go/vt/vttablet/grpctmclient/client.go         |   6 +-
 go/vt/vttablet/grpctmserver/server.go         |   4 +-
 go/vt/vttablet/tabletmanager/rpc_agent.go     |   2 +-
 .../vttablet/tabletmanager/rpc_replication.go |   6 +-
 go/vt/vttablet/tmclient/rpc_client_api.go     |   2 +-
 go/vt/vttablet/tmrpctest/test_tm_rpc.go       |   2 +-
 proto/tabletmanagerdata.proto                 |   1 +
 web/vtadmin/src/proto/vtadmin.d.ts            |   6 +
 web/vtadmin/src/proto/vtadmin.js              |  33 +++-
 17 files changed, 185 insertions(+), 105 deletions(-)

diff --git a/go/test/fuzzing/vttablet_fuzzer.go b/go/test/fuzzing/vttablet_fuzzer.go
index ede5ea965d9..77f20b77a94 100644
--- a/go/test/fuzzing/vttablet_fuzzer.go
+++ b/go/test/fuzzing/vttablet_fuzzer.go
@@ -419,7 +419,7 @@ func (fs *fuzzStore) callUndoDemotePrimary() error {
 	if err != nil {
 		return err
 	}
-	_ = fs.client.UndoDemotePrimary(context.Background(), tablet)
+	_ = fs.client.UndoDemotePrimary(context.Background(), tablet, false)
 	return nil
 }
 
diff --git a/go/vt/orchestrator/logic/tablet_discovery.go b/go/vt/orchestrator/logic/tablet_discovery.go
index 8b0ee13221e..5ee009d0b7a 100644
--- a/go/vt/orchestrator/logic/tablet_discovery.go
+++ b/go/vt/orchestrator/logic/tablet_discovery.go
@@ -311,7 +311,7 @@ func tabletDemotePrimary(instanceKey inst.InstanceKey, forward bool) error {
 	if forward {
 		_, err = tmc.DemotePrimary(ctx, tablet)
 	} else {
-		err = tmc.UndoDemotePrimary(ctx, tablet)
+		err = tmc.UndoDemotePrimary(ctx, tablet, inst.SemiSyncAckers(instanceKey) > 0)
 	}
 	return err
 }
diff --git a/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go b/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go
index bb3ab3b4242..62f61394910 100644
--- a/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go
+++ b/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go
@@ -3829,6 +3829,8 @@ type UndoDemotePrimaryRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
+
+	SemiSync bool `protobuf:"varint,1,opt,name=semiSync,proto3" json:"semiSync,omitempty"`
 }
 
 func (x *UndoDemotePrimaryRequest) Reset() {
@@ -3863,6 +3865,13 @@ func (*UndoDemotePrimaryRequest) Descriptor() ([]byte, []int) {
 	return file_tabletmanagerdata_proto_rawDescGZIP(), []int{78}
 }
 
+func (x *UndoDemotePrimaryRequest) GetSemiSync() bool {
+	if x != nil {
+		return x.SemiSync
+	}
+	return false
+}
+
 type UndoDemotePrimaryResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -5055,93 +5064,95 @@ var file_tabletmanagerdata_proto_rawDesc = []byte{
 	0x72, 0x79, 0x5f, 0x73, 0x74, 0x61, 0x74, 0x75, 0x73, 0x18, 0x02, 0x20, 0x01, 0x28, 0x0b, 0x32,
 	0x1e, 0x2e, 0x72, 0x65, 0x70, 0x6c, 0x69, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x64, 0x61, 0x74,
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+	0x6d, 0x65, 0x52, 0x0a, 0x62, 0x61, 0x63, 0x6b, 0x75, 0x70, 0x54, 0x69, 0x6d, 0x65, 0x22, 0x41,
+	0x0a, 0x19, 0x52, 0x65, 0x73, 0x74, 0x6f, 0x72, 0x65, 0x46, 0x72, 0x6f, 0x6d, 0x42, 0x61, 0x63,
+	0x6b, 0x75, 0x70, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x12, 0x24, 0x0a, 0x05, 0x65,
+	0x76, 0x65, 0x6e, 0x74, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x0e, 0x2e, 0x6c, 0x6f, 0x67,
+	0x75, 0x74, 0x69, 0x6c, 0x2e, 0x45, 0x76, 0x65, 0x6e, 0x74, 0x52, 0x05, 0x65, 0x76, 0x65, 0x6e,
+	0x74, 0x22, 0x5c, 0x0a, 0x0c, 0x56, 0x45, 0x78, 0x65, 0x63, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73,
+	0x74, 0x12, 0x14, 0x0a, 0x05, 0x71, 0x75, 0x65, 0x72, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09,
+	0x52, 0x05, 0x71, 0x75, 0x65, 0x72, 0x79, 0x12, 0x1a, 0x0a, 0x08, 0x77, 0x6f, 0x72, 0x6b, 0x66,
+	0x6c, 0x6f, 0x77, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x08, 0x77, 0x6f, 0x72, 0x6b, 0x66,
+	0x6c, 0x6f, 0x77, 0x12, 0x1a, 0x0a, 0x08, 0x6b, 0x65, 0x79, 0x73, 0x70, 0x61, 0x63, 0x65, 0x18,
+	0x03, 0x20, 0x01, 0x28, 0x09, 0x52, 0x08, 0x6b, 0x65, 0x79, 0x73, 0x70, 0x61, 0x63, 0x65, 0x22,
+	0x3b, 0x0a, 0x0d, 0x56, 0x45, 0x78, 0x65, 0x63, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65,
+	0x12, 0x2a, 0x0a, 0x06, 0x72, 0x65, 0x73, 0x75, 0x6c, 0x74, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0b,
+	0x32, 0x12, 0x2e, 0x71, 0x75, 0x65, 0x72, 0x79, 0x2e, 0x51, 0x75, 0x65, 0x72, 0x79, 0x52, 0x65,
+	0x73, 0x75, 0x6c, 0x74, 0x52, 0x06, 0x72, 0x65, 0x73, 0x75, 0x6c, 0x74, 0x42, 0x30, 0x5a, 0x2e,
+	0x76, 0x69, 0x74, 0x65, 0x73, 0x73, 0x2e, 0x69, 0x6f, 0x2f, 0x76, 0x69, 0x74, 0x65, 0x73, 0x73,
+	0x2f, 0x67, 0x6f, 0x2f, 0x76, 0x74, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x74, 0x61, 0x62,
+	0x6c, 0x65, 0x74, 0x6d, 0x61, 0x6e, 0x61, 0x67, 0x65, 0x72, 0x64, 0x61, 0x74, 0x61, 0x62, 0x06,
+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go b/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go
index 4c4fd7e0511..1228b9f83a1 100644
--- a/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go
+++ b/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go
@@ -3401,6 +3401,16 @@ func (m *UndoDemotePrimaryRequest) MarshalToSizedBufferVT(dAtA []byte) (int, err
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
+	if m.SemiSync {
+		i--
+		if m.SemiSync {
+			dAtA[i] = 1
+		} else {
+			dAtA[i] = 0
+		}
+		i--
+		dAtA[i] = 0x8
+	}
 	return len(dAtA) - i, nil
 }
 
@@ -5463,6 +5473,9 @@ func (m *UndoDemotePrimaryRequest) SizeVT() (n int) {
 	}
 	var l int
 	_ = l
+	if m.SemiSync {
+		n += 2
+	}
 	if m.unknownFields != nil {
 		n += len(m.unknownFields)
 	}
@@ -12816,6 +12829,26 @@ func (m *UndoDemotePrimaryRequest) UnmarshalVT(dAtA []byte) error {
 			return fmt.Errorf("proto: UndoDemotePrimaryRequest: illegal tag %d (wire type %d)", fieldNum, wire)
 		}
 		switch fieldNum {
+		case 1:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field SemiSync", wireType)
+			}
+			var v int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				v |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			m.SemiSync = bool(v != 0)
 		default:
 			iNdEx = preIndex
 			skippy, err := skip(dAtA[iNdEx:])
diff --git a/go/vt/vtcombo/tablet_map.go b/go/vt/vtcombo/tablet_map.go
index e8214913456..9771dde83be 100644
--- a/go/vt/vtcombo/tablet_map.go
+++ b/go/vt/vtcombo/tablet_map.go
@@ -953,7 +953,7 @@ func (itmc *internalTabletManagerClient) DemotePrimary(context.Context, *topodat
 	return nil, fmt.Errorf("not implemented in vtcombo")
 }
 
-func (itmc *internalTabletManagerClient) UndoDemotePrimary(context.Context, *topodatapb.Tablet) error {
+func (itmc *internalTabletManagerClient) UndoDemotePrimary(context.Context, *topodatapb.Tablet, bool) error {
 	return fmt.Errorf("not implemented in vtcombo")
 }
 
diff --git a/go/vt/vtctl/grpcvtctldserver/testutil/test_tmclient.go b/go/vt/vtctl/grpcvtctldserver/testutil/test_tmclient.go
index f4a80fcf185..0e075d14bc1 100644
--- a/go/vt/vtctl/grpcvtctldserver/testutil/test_tmclient.go
+++ b/go/vt/vtctl/grpcvtctldserver/testutil/test_tmclient.go
@@ -877,7 +877,7 @@ func (fake *TabletManagerClient) WaitForPosition(ctx context.Context, tablet *to
 }
 
 // UndoDemotePrimary is part of the tmclient.TabletManagerClient interface.
-func (fake *TabletManagerClient) UndoDemotePrimary(ctx context.Context, tablet *topodatapb.Tablet) error {
+func (fake *TabletManagerClient) UndoDemotePrimary(ctx context.Context, tablet *topodatapb.Tablet, semiSync bool) error {
 	if fake.UndoDemotePrimaryResults == nil {
 		return assert.AnError
 	}
diff --git a/go/vt/vtctl/reparentutil/planned_reparenter.go b/go/vt/vtctl/reparentutil/planned_reparenter.go
index 1339a0cfae4..a12fc731ffe 100644
--- a/go/vt/vtctl/reparentutil/planned_reparenter.go
+++ b/go/vt/vtctl/reparentutil/planned_reparenter.go
@@ -275,7 +275,7 @@ func (pr *PlannedReparenter) performGracefulPromotion(
 		undoCtx, undoCancel := context.WithTimeout(context.Background(), *topo.RemoteOperationTimeout)
 		defer undoCancel()
 
-		if undoErr := pr.tmc.UndoDemotePrimary(undoCtx, currentPrimary.Tablet); undoErr != nil {
+		if undoErr := pr.tmc.UndoDemotePrimary(undoCtx, currentPrimary.Tablet, SemiSyncAckers(currentPrimary.Tablet) > 0); undoErr != nil {
 			pr.logger.Warningf("encountered error while performing UndoDemotePrimary(%v): %v", currentPrimary.AliasString(), undoErr)
 			finalWaitErr = vterrors.Wrapf(finalWaitErr, "encountered error while performing UndoDemotePrimary(%v): %v", currentPrimary.AliasString(), undoErr)
 		}
diff --git a/go/vt/vttablet/faketmclient/fake_client.go b/go/vt/vttablet/faketmclient/fake_client.go
index aea6a475a5e..d3caf157358 100644
--- a/go/vt/vttablet/faketmclient/fake_client.go
+++ b/go/vt/vttablet/faketmclient/fake_client.go
@@ -311,7 +311,7 @@ func (client *FakeTabletManagerClient) DemotePrimary(ctx context.Context, tablet
 }
 
 // UndoDemotePrimary is part of the tmclient.TabletManagerClient interface.
-func (client *FakeTabletManagerClient) UndoDemotePrimary(ctx context.Context, tablet *topodatapb.Tablet) error {
+func (client *FakeTabletManagerClient) UndoDemotePrimary(ctx context.Context, tablet *topodatapb.Tablet, semiSync bool) error {
 	return nil
 }
 
diff --git a/go/vt/vttablet/grpctmclient/client.go b/go/vt/vttablet/grpctmclient/client.go
index 8e844d17f3b..5b0c2add0fe 100644
--- a/go/vt/vttablet/grpctmclient/client.go
+++ b/go/vt/vttablet/grpctmclient/client.go
@@ -853,13 +853,15 @@ func (client *Client) UndoDemoteMaster(ctx context.Context, tablet *topodatapb.T
 }
 
 // UndoDemotePrimary is part of the tmclient.TabletManagerClient interface.
-func (client *Client) UndoDemotePrimary(ctx context.Context, tablet *topodatapb.Tablet) error {
+func (client *Client) UndoDemotePrimary(ctx context.Context, tablet *topodatapb.Tablet, semiSync bool) error {
 	c, closer, err := client.dialer.dial(ctx, tablet)
 	if err != nil {
 		return err
 	}
 	defer closer.Close()
-	_, err = c.UndoDemotePrimary(ctx, &tabletmanagerdatapb.UndoDemotePrimaryRequest{})
+	_, err = c.UndoDemotePrimary(ctx, &tabletmanagerdatapb.UndoDemotePrimaryRequest{
+		SemiSync: semiSync,
+	})
 	return err
 }
 
diff --git a/go/vt/vttablet/grpctmserver/server.go b/go/vt/vttablet/grpctmserver/server.go
index 20b1664ba23..17399ab3eb7 100644
--- a/go/vt/vttablet/grpctmserver/server.go
+++ b/go/vt/vttablet/grpctmserver/server.go
@@ -451,7 +451,7 @@ func (s *server) UndoDemoteMaster(ctx context.Context, request *tabletmanagerdat
 	defer s.tm.HandleRPCPanic(ctx, "UndoDemoteMaster", request, response, true /*verbose*/, &err)
 	ctx = callinfo.GRPCCallInfo(ctx)
 	response = &tabletmanagerdatapb.UndoDemotePrimaryResponse{}
-	err = s.tm.UndoDemotePrimary(ctx)
+	err = s.tm.UndoDemotePrimary(ctx, request.GetSemiSync())
 	return response, err
 }
 
@@ -459,7 +459,7 @@ func (s *server) UndoDemotePrimary(ctx context.Context, request *tabletmanagerda
 	defer s.tm.HandleRPCPanic(ctx, "UndoDemotePrimary", request, response, true /*verbose*/, &err)
 	ctx = callinfo.GRPCCallInfo(ctx)
 	response = &tabletmanagerdatapb.UndoDemotePrimaryResponse{}
-	err = s.tm.UndoDemotePrimary(ctx)
+	err = s.tm.UndoDemotePrimary(ctx, request.GetSemiSync())
 	return response, err
 }
 
diff --git a/go/vt/vttablet/tabletmanager/rpc_agent.go b/go/vt/vttablet/tabletmanager/rpc_agent.go
index b057de57ae7..d4094bc14da 100644
--- a/go/vt/vttablet/tabletmanager/rpc_agent.go
+++ b/go/vt/vttablet/tabletmanager/rpc_agent.go
@@ -130,7 +130,7 @@ type RPCTM interface {
 
 	DemotePrimary(ctx context.Context) (*replicationdatapb.PrimaryStatus, error)
 
-	UndoDemotePrimary(ctx context.Context) error
+	UndoDemotePrimary(ctx context.Context, semiSync bool) error
 
 	ReplicaWasPromoted(ctx context.Context) error
 
diff --git a/go/vt/vttablet/tabletmanager/rpc_replication.go b/go/vt/vttablet/tabletmanager/rpc_replication.go
index c9255044b47..a82d39c9885 100644
--- a/go/vt/vttablet/tabletmanager/rpc_replication.go
+++ b/go/vt/vttablet/tabletmanager/rpc_replication.go
@@ -489,13 +489,13 @@ func (tm *TabletManager) demotePrimary(ctx context.Context, revertPartialFailure
 
 // UndoDemoteMaster is the old version of UndoDemotePrimary. Deprecated.
 func (tm *TabletManager) UndoDemoteMaster(ctx context.Context) error {
-	return tm.UndoDemotePrimary(ctx)
+	return tm.UndoDemotePrimary(ctx, false)
 }
 
 // UndoDemotePrimary reverts a previous call to DemotePrimary
 // it sets read-only to false, fixes semi-sync
 // and returns its primary position.
-func (tm *TabletManager) UndoDemotePrimary(ctx context.Context) error {
+func (tm *TabletManager) UndoDemotePrimary(ctx context.Context, semiSync bool) error {
 	log.Infof("UndoDemotePrimary")
 	if err := tm.lock(ctx); err != nil {
 		return err
@@ -503,7 +503,7 @@ func (tm *TabletManager) UndoDemotePrimary(ctx context.Context) error {
 	defer tm.unlock()
 
 	// If using semi-sync, we need to enable source-side.
-	if err := tm.fixSemiSync(topodatapb.TabletType_PRIMARY, SemiSyncActionFalse); err != nil {
+	if err := tm.fixSemiSync(topodatapb.TabletType_PRIMARY, convertBoolToSemiSyncAction(semiSync)); err != nil {
 		return err
 	}
 
diff --git a/go/vt/vttablet/tmclient/rpc_client_api.go b/go/vt/vttablet/tmclient/rpc_client_api.go
index dd8ba2ea7e5..ae17b156f9c 100644
--- a/go/vt/vttablet/tmclient/rpc_client_api.go
+++ b/go/vt/vttablet/tmclient/rpc_client_api.go
@@ -195,7 +195,7 @@ type TabletManagerClient interface {
 
 	// UndoDemotePrimary reverts all changes made by DemotePrimary
 	// To be used if we are unable to promote the chosen new primary
-	UndoDemotePrimary(ctx context.Context, tablet *topodatapb.Tablet) error
+	UndoDemotePrimary(ctx context.Context, tablet *topodatapb.Tablet, semiSync bool) error
 
 	// ReplicaWasPromoted tells the remote tablet it is now the primary
 	ReplicaWasPromoted(ctx context.Context, tablet *topodatapb.Tablet) error
diff --git a/go/vt/vttablet/tmrpctest/test_tm_rpc.go b/go/vt/vttablet/tmrpctest/test_tm_rpc.go
index 9cf5208ec76..f1b13380d3d 100644
--- a/go/vt/vttablet/tmrpctest/test_tm_rpc.go
+++ b/go/vt/vttablet/tmrpctest/test_tm_rpc.go
@@ -1056,7 +1056,7 @@ func tmRPCTestDemoteMasterPanic(ctx context.Context, t *testing.T, client tmclie
 
 var testUndoDemoteMasterCalled = false
 
-func (fra *fakeRPCTM) UndoDemotePrimary(ctx context.Context) error {
+func (fra *fakeRPCTM) UndoDemotePrimary(ctx context.Context, semiSync bool) error {
 	if fra.panics {
 		panic(fmt.Errorf("test-triggered panic"))
 	}
diff --git a/proto/tabletmanagerdata.proto b/proto/tabletmanagerdata.proto
index 903520455d6..d3f091aac4c 100644
--- a/proto/tabletmanagerdata.proto
+++ b/proto/tabletmanagerdata.proto
@@ -398,6 +398,7 @@ message DemotePrimaryResponse {
 }
 
 message UndoDemotePrimaryRequest {
+  bool semiSync = 1;
 }
 
 message UndoDemotePrimaryResponse {
diff --git a/web/vtadmin/src/proto/vtadmin.d.ts b/web/vtadmin/src/proto/vtadmin.d.ts
index dacbbc56fb5..f3c714bd4d9 100644
--- a/web/vtadmin/src/proto/vtadmin.d.ts
+++ b/web/vtadmin/src/proto/vtadmin.d.ts
@@ -17482,6 +17482,9 @@ export namespace tabletmanagerdata {
 
     /** Properties of an UndoDemotePrimaryRequest. */
     interface IUndoDemotePrimaryRequest {
+
+        /** UndoDemotePrimaryRequest semiSync */
+        semiSync?: (boolean|null);
     }
 
     /** Represents an UndoDemotePrimaryRequest. */
@@ -17493,6 +17496,9 @@ export namespace tabletmanagerdata {
          */
         constructor(properties?: tabletmanagerdata.IUndoDemotePrimaryRequest);
 
+        /** UndoDemotePrimaryRequest semiSync. */
+        public semiSync: boolean;
+
         /**
          * Creates a new UndoDemotePrimaryRequest instance using the specified properties.
          * @param [properties] Properties to set
diff --git a/web/vtadmin/src/proto/vtadmin.js b/web/vtadmin/src/proto/vtadmin.js
index 2c1958ac2fc..6917c81b4e6 100644
--- a/web/vtadmin/src/proto/vtadmin.js
+++ b/web/vtadmin/src/proto/vtadmin.js
@@ -39652,6 +39652,7 @@ $root.tabletmanagerdata = (function() {
          * Properties of an UndoDemotePrimaryRequest.
          * @memberof tabletmanagerdata
          * @interface IUndoDemotePrimaryRequest
+         * @property {boolean|null} [semiSync] UndoDemotePrimaryRequest semiSync
          */
 
         /**
@@ -39669,6 +39670,14 @@ $root.tabletmanagerdata = (function() {
                         this[keys[i]] = properties[keys[i]];
         }
 
+        /**
+         * UndoDemotePrimaryRequest semiSync.
+         * @member {boolean} semiSync
+         * @memberof tabletmanagerdata.UndoDemotePrimaryRequest
+         * @instance
+         */
+        UndoDemotePrimaryRequest.prototype.semiSync = false;
+
         /**
          * Creates a new UndoDemotePrimaryRequest instance using the specified properties.
          * @function create
@@ -39693,6 +39702,8 @@ $root.tabletmanagerdata = (function() {
         UndoDemotePrimaryRequest.encode = function encode(message, writer) {
             if (!writer)
                 writer = $Writer.create();
+            if (message.semiSync != null && Object.hasOwnProperty.call(message, "semiSync"))
+                writer.uint32(/* id 1, wireType 0 =*/8).bool(message.semiSync);
             return writer;
         };
 
@@ -39727,6 +39738,9 @@ $root.tabletmanagerdata = (function() {
             while (reader.pos < end) {
                 var tag = reader.uint32();
                 switch (tag >>> 3) {
+                case 1:
+                    message.semiSync = reader.bool();
+                    break;
                 default:
                     reader.skipType(tag & 7);
                     break;
@@ -39762,6 +39776,9 @@ $root.tabletmanagerdata = (function() {
         UndoDemotePrimaryRequest.verify = function verify(message) {
             if (typeof message !== "object" || message === null)
                 return "object expected";
+            if (message.semiSync != null && message.hasOwnProperty("semiSync"))
+                if (typeof message.semiSync !== "boolean")
+                    return "semiSync: boolean expected";
             return null;
         };
 
@@ -39776,7 +39793,10 @@ $root.tabletmanagerdata = (function() {
         UndoDemotePrimaryRequest.fromObject = function fromObject(object) {
             if (object instanceof $root.tabletmanagerdata.UndoDemotePrimaryRequest)
                 return object;
-            return new $root.tabletmanagerdata.UndoDemotePrimaryRequest();
+            var message = new $root.tabletmanagerdata.UndoDemotePrimaryRequest();
+            if (object.semiSync != null)
+                message.semiSync = Boolean(object.semiSync);
+            return message;
         };
 
         /**
@@ -39788,8 +39808,15 @@ $root.tabletmanagerdata = (function() {
          * @param {$protobuf.IConversionOptions} [options] Conversion options
          * @returns {Object.<string,*>} Plain object
          */
-        UndoDemotePrimaryRequest.toObject = function toObject() {
-            return {};
+        UndoDemotePrimaryRequest.toObject = function toObject(message, options) {
+            if (!options)
+                options = {};
+            var object = {};
+            if (options.defaults)
+                object.semiSync = false;
+            if (message.semiSync != null && message.hasOwnProperty("semiSync"))
+                object.semiSync = message.semiSync;
+            return object;
         };
 
         /**

From 8f045ddd36ee84ab5ded8d7287d8a2b4d810a0e5 Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Mon, 17 Jan 2022 15:03:17 +0530
Subject: [PATCH 09/30] feat: change UndoDemoteMaster rpc to allow passing in
 semiSync as a parameter

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 go/vt/vtcombo/tablet_map.go                     | 2 +-
 go/vt/vttablet/faketmclient/fake_client.go      | 2 +-
 go/vt/vttablet/grpctmclient/client.go           | 6 ++++--
 go/vt/vttablet/tabletmanager/rpc_agent.go       | 2 +-
 go/vt/vttablet/tabletmanager/rpc_replication.go | 4 ++--
 go/vt/vttablet/tmclient/rpc_client_api.go       | 2 +-
 go/vt/vttablet/tmrpctest/test_tm_rpc.go         | 6 +++---
 7 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/go/vt/vtcombo/tablet_map.go b/go/vt/vtcombo/tablet_map.go
index 9771dde83be..c33744de6bb 100644
--- a/go/vt/vtcombo/tablet_map.go
+++ b/go/vt/vtcombo/tablet_map.go
@@ -945,7 +945,7 @@ func (itmc *internalTabletManagerClient) DemoteMaster(context.Context, *topodata
 	return nil, fmt.Errorf("not implemented in vtcombo")
 }
 
-func (itmc *internalTabletManagerClient) UndoDemoteMaster(context.Context, *topodatapb.Tablet) error {
+func (itmc *internalTabletManagerClient) UndoDemoteMaster(context.Context, *topodatapb.Tablet, bool) error {
 	return fmt.Errorf("not implemented in vtcombo")
 }
 
diff --git a/go/vt/vttablet/faketmclient/fake_client.go b/go/vt/vttablet/faketmclient/fake_client.go
index d3caf157358..064fb448573 100644
--- a/go/vt/vttablet/faketmclient/fake_client.go
+++ b/go/vt/vttablet/faketmclient/fake_client.go
@@ -301,7 +301,7 @@ func (client *FakeTabletManagerClient) DemoteMaster(ctx context.Context, tablet
 }
 
 // UndoDemoteMaster is part of the tmclient.TabletManagerClient interface.
-func (client *FakeTabletManagerClient) UndoDemoteMaster(ctx context.Context, tablet *topodatapb.Tablet) error {
+func (client *FakeTabletManagerClient) UndoDemoteMaster(ctx context.Context, tablet *topodatapb.Tablet, semiSync bool) error {
 	return nil
 }
 
diff --git a/go/vt/vttablet/grpctmclient/client.go b/go/vt/vttablet/grpctmclient/client.go
index 5b0c2add0fe..890835ee1ab 100644
--- a/go/vt/vttablet/grpctmclient/client.go
+++ b/go/vt/vttablet/grpctmclient/client.go
@@ -842,13 +842,15 @@ func (client *Client) DemotePrimary(ctx context.Context, tablet *topodatapb.Tabl
 }
 
 // UndoDemoteMaster is part of the tmclient.TabletManagerClient interface.
-func (client *Client) UndoDemoteMaster(ctx context.Context, tablet *topodatapb.Tablet) error {
+func (client *Client) UndoDemoteMaster(ctx context.Context, tablet *topodatapb.Tablet, semiSync bool) error {
 	c, closer, err := client.dialer.dial(ctx, tablet)
 	if err != nil {
 		return err
 	}
 	defer closer.Close()
-	_, err = c.UndoDemoteMaster(ctx, &tabletmanagerdatapb.UndoDemotePrimaryRequest{})
+	_, err = c.UndoDemoteMaster(ctx, &tabletmanagerdatapb.UndoDemotePrimaryRequest{
+		SemiSync: semiSync,
+	})
 	return err
 }
 
diff --git a/go/vt/vttablet/tabletmanager/rpc_agent.go b/go/vt/vttablet/tabletmanager/rpc_agent.go
index d4094bc14da..efb8336447c 100644
--- a/go/vt/vttablet/tabletmanager/rpc_agent.go
+++ b/go/vt/vttablet/tabletmanager/rpc_agent.go
@@ -126,7 +126,7 @@ type RPCTM interface {
 	DemoteMaster(ctx context.Context) (*replicationdatapb.PrimaryStatus, error)
 
 	// Deprecated, use UndoDemotePrimary instead
-	UndoDemoteMaster(ctx context.Context) error
+	UndoDemoteMaster(ctx context.Context, semiSync bool) error
 
 	DemotePrimary(ctx context.Context) (*replicationdatapb.PrimaryStatus, error)
 
diff --git a/go/vt/vttablet/tabletmanager/rpc_replication.go b/go/vt/vttablet/tabletmanager/rpc_replication.go
index a82d39c9885..8096c63c7b4 100644
--- a/go/vt/vttablet/tabletmanager/rpc_replication.go
+++ b/go/vt/vttablet/tabletmanager/rpc_replication.go
@@ -488,8 +488,8 @@ func (tm *TabletManager) demotePrimary(ctx context.Context, revertPartialFailure
 }
 
 // UndoDemoteMaster is the old version of UndoDemotePrimary. Deprecated.
-func (tm *TabletManager) UndoDemoteMaster(ctx context.Context) error {
-	return tm.UndoDemotePrimary(ctx, false)
+func (tm *TabletManager) UndoDemoteMaster(ctx context.Context, semiSync bool) error {
+	return tm.UndoDemotePrimary(ctx, semiSync)
 }
 
 // UndoDemotePrimary reverts a previous call to DemotePrimary
diff --git a/go/vt/vttablet/tmclient/rpc_client_api.go b/go/vt/vttablet/tmclient/rpc_client_api.go
index ae17b156f9c..19621be0312 100644
--- a/go/vt/vttablet/tmclient/rpc_client_api.go
+++ b/go/vt/vttablet/tmclient/rpc_client_api.go
@@ -187,7 +187,7 @@ type TabletManagerClient interface {
 
 	// Deprecated UndoDemoteMaster reverts all changes made by DemoteMaster
 	// To be used if we are unable to promote the chosen new primary
-	UndoDemoteMaster(ctx context.Context, tablet *topodatapb.Tablet) error
+	UndoDemoteMaster(ctx context.Context, tablet *topodatapb.Tablet, semiSync bool) error
 
 	// DemotePrimary tells the soon-to-be-former primary it's going to change,
 	// and it should go read-only and return its current position.
diff --git a/go/vt/vttablet/tmrpctest/test_tm_rpc.go b/go/vt/vttablet/tmrpctest/test_tm_rpc.go
index f1b13380d3d..efc0c4a5646 100644
--- a/go/vt/vttablet/tmrpctest/test_tm_rpc.go
+++ b/go/vt/vttablet/tmrpctest/test_tm_rpc.go
@@ -1064,7 +1064,7 @@ func (fra *fakeRPCTM) UndoDemotePrimary(ctx context.Context, semiSync bool) erro
 }
 
 // Deprecated
-func (fra *fakeRPCTM) UndoDemoteMaster(ctx context.Context) error {
+func (fra *fakeRPCTM) UndoDemoteMaster(ctx context.Context, semiSync bool) error {
 	if fra.panics {
 		panic(fmt.Errorf("test-triggered panic"))
 	}
@@ -1072,13 +1072,13 @@ func (fra *fakeRPCTM) UndoDemoteMaster(ctx context.Context) error {
 }
 
 func tmRPCTestUndoDemoteMaster(ctx context.Context, t *testing.T, client tmclient.TabletManagerClient, tablet *topodatapb.Tablet) {
-	err := client.UndoDemoteMaster(ctx, tablet)
+	err := client.UndoDemoteMaster(ctx, tablet, false)
 	testUndoDemoteMasterCalled = true
 	compareError(t, "UndoDemoteMaster", err, true, testUndoDemoteMasterCalled)
 }
 
 func tmRPCTestUndoDemoteMasterPanic(ctx context.Context, t *testing.T, client tmclient.TabletManagerClient, tablet *topodatapb.Tablet) {
-	err := client.UndoDemoteMaster(ctx, tablet)
+	err := client.UndoDemoteMaster(ctx, tablet, false)
 	expectHandleRPCPanic(t, "UndoDemoteMaster", true /*verbose*/, err)
 }
 

From 1de77a3818bee934d5193bced2980450297e6d9c Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Mon, 17 Jan 2022 15:44:39 +0530
Subject: [PATCH 10/30] feat: change SetReplicationSource rpc to allow passing
 in semiSync as a parameter

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 .../tabletmanagerdata/tabletmanagerdata.pb.go | 144 ++++++++++--------
 .../tabletmanagerdata_vtproto.pb.go           |  33 ++++
 go/vt/vtcombo/tablet_map.go                   |   2 +-
 go/vt/vtctl/grpcvtctldserver/server.go        |   2 +-
 .../testutil/test_tmclient.go                 |   2 +-
 .../reparentutil/emergency_reparenter.go      |   2 +-
 .../vtctl/reparentutil/planned_reparenter.go  |   4 +-
 go/vt/vttablet/faketmclient/fake_client.go    |   2 +-
 go/vt/vttablet/grpctmclient/client.go         |   3 +-
 go/vt/vttablet/grpctmserver/server.go         |   4 +-
 go/vt/vttablet/tabletmanager/rpc_agent.go     |   2 +-
 .../vttablet/tabletmanager/rpc_replication.go |  24 ++-
 go/vt/vttablet/tabletmanager/shard_sync.go    |   2 +-
 go/vt/vttablet/tmclient/rpc_client_api.go     |   2 +-
 go/vt/vttablet/tmrpctest/test_tm_rpc.go       |   2 +-
 proto/tabletmanagerdata.proto                 |   1 +
 web/vtadmin/src/proto/vtadmin.d.ts            |   6 +
 web/vtadmin/src/proto/vtadmin.js              |  22 +++
 18 files changed, 171 insertions(+), 88 deletions(-)

diff --git a/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go b/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go
index 62f61394910..c2c0c056d97 100644
--- a/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go
+++ b/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go
@@ -3995,6 +3995,7 @@ type SetReplicationSourceRequest struct {
 	TimeCreatedNs         int64                 `protobuf:"varint,2,opt,name=time_created_ns,json=timeCreatedNs,proto3" json:"time_created_ns,omitempty"`
 	ForceStartReplication bool                  `protobuf:"varint,3,opt,name=force_start_replication,json=forceStartReplication,proto3" json:"force_start_replication,omitempty"`
 	WaitPosition          string                `protobuf:"bytes,4,opt,name=wait_position,json=waitPosition,proto3" json:"wait_position,omitempty"`
+	SemiSync              bool                  `protobuf:"varint,5,opt,name=semiSync,proto3" json:"semiSync,omitempty"`
 }
 
 func (x *SetReplicationSourceRequest) Reset() {
@@ -4057,6 +4058,13 @@ func (x *SetReplicationSourceRequest) GetWaitPosition() string {
 	return ""
 }
 
+func (x *SetReplicationSourceRequest) GetSemiSync() bool {
+	if x != nil {
+		return x.SemiSync
+	}
+	return false
+}
+
 type SetReplicationSourceResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -5073,7 +5081,7 @@ var file_tabletmanagerdata_proto_rawDesc = []byte{
 	0x6e, 0x73, 0x65, 0x22, 0x1b, 0x0a, 0x19, 0x52, 0x65, 0x70, 0x6c, 0x69, 0x63, 0x61, 0x57, 0x61,
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-	0x6f, 0x6d, 0x6f, 0x74, 0x65, 0x64, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22, 0xd1,
+	0x6f, 0x6d, 0x6f, 0x74, 0x65, 0x64, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22, 0xed,
 	0x01, 0x0a, 0x1b, 0x53, 0x65, 0x74, 0x52, 0x65, 0x70, 0x6c, 0x69, 0x63, 0x61, 0x74, 0x69, 0x6f,
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@@ -5087,72 +5095,74 @@ var file_tabletmanagerdata_proto_rawDesc = []byte{
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+	0x72, 0x65, 0x73, 0x75, 0x6c, 0x74, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x12, 0x2e, 0x71,
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+	0x52, 0x06, 0x72, 0x65, 0x73, 0x75, 0x6c, 0x74, 0x42, 0x30, 0x5a, 0x2e, 0x76, 0x69, 0x74, 0x65,
+	0x73, 0x73, 0x2e, 0x69, 0x6f, 0x2f, 0x76, 0x69, 0x74, 0x65, 0x73, 0x73, 0x2f, 0x67, 0x6f, 0x2f,
+	0x76, 0x74, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x74, 0x61, 0x62, 0x6c, 0x65, 0x74, 0x6d,
+	0x61, 0x6e, 0x61, 0x67, 0x65, 0x72, 0x64, 0x61, 0x74, 0x61, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x33,
 }
 
 var (
diff --git a/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go b/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go
index 1228b9f83a1..8fe41378528 100644
--- a/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go
+++ b/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go
@@ -3543,6 +3543,16 @@ func (m *SetReplicationSourceRequest) MarshalToSizedBufferVT(dAtA []byte) (int,
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
+	if m.SemiSync {
+		i--
+		if m.SemiSync {
+			dAtA[i] = 1
+		} else {
+			dAtA[i] = 0
+		}
+		i--
+		dAtA[i] = 0x28
+	}
 	if len(m.WaitPosition) > 0 {
 		i -= len(m.WaitPosition)
 		copy(dAtA[i:], m.WaitPosition)
@@ -5538,6 +5548,9 @@ func (m *SetReplicationSourceRequest) SizeVT() (n int) {
 	if l > 0 {
 		n += 1 + l + sov(uint64(l))
 	}
+	if m.SemiSync {
+		n += 2
+	}
 	if m.unknownFields != nil {
 		n += len(m.unknownFields)
 	}
@@ -13160,6 +13173,26 @@ func (m *SetReplicationSourceRequest) UnmarshalVT(dAtA []byte) error {
 			}
 			m.WaitPosition = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
+		case 5:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field SemiSync", wireType)
+			}
+			var v int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				v |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			m.SemiSync = bool(v != 0)
 		default:
 			iNdEx = preIndex
 			skippy, err := skip(dAtA[iNdEx:])
diff --git a/go/vt/vtcombo/tablet_map.go b/go/vt/vtcombo/tablet_map.go
index c33744de6bb..7c97c6e7d8b 100644
--- a/go/vt/vtcombo/tablet_map.go
+++ b/go/vt/vtcombo/tablet_map.go
@@ -961,7 +961,7 @@ func (itmc *internalTabletManagerClient) SetMaster(context.Context, *topodatapb.
 	return fmt.Errorf("not implemented in vtcombo")
 }
 
-func (itmc *internalTabletManagerClient) SetReplicationSource(context.Context, *topodatapb.Tablet, *topodatapb.TabletAlias, int64, string, bool) error {
+func (itmc *internalTabletManagerClient) SetReplicationSource(context.Context, *topodatapb.Tablet, *topodatapb.TabletAlias, int64, string, bool, bool) error {
 	return fmt.Errorf("not implemented in vtcombo")
 }
 
diff --git a/go/vt/vtctl/grpcvtctldserver/server.go b/go/vt/vtctl/grpcvtctldserver/server.go
index 941a779ee5f..6a881ff652c 100644
--- a/go/vt/vtctl/grpcvtctldserver/server.go
+++ b/go/vt/vtctl/grpcvtctldserver/server.go
@@ -1923,7 +1923,7 @@ func (s *VtctldServer) ReparentTablet(ctx context.Context, req *vtctldatapb.Repa
 		return nil, vterrors.Errorf(vtrpc.Code_FAILED_PRECONDITION, "cannot ReparentTablet current shard primary (%v) onto itself", topoproto.TabletAliasString(req.Tablet))
 	}
 
-	if err := s.tmc.SetReplicationSource(ctx, tablet.Tablet, shard.PrimaryAlias, 0, "", false); err != nil {
+	if err := s.tmc.SetReplicationSource(ctx, tablet.Tablet, shard.PrimaryAlias, 0, "", false, reparentutil.ReplicaSemiSync(shardPrimary.Tablet, tablet.Tablet)); err != nil {
 		return nil, err
 	}
 
diff --git a/go/vt/vtctl/grpcvtctldserver/testutil/test_tmclient.go b/go/vt/vtctl/grpcvtctldserver/testutil/test_tmclient.go
index 0e075d14bc1..3e9a9cfef47 100644
--- a/go/vt/vtctl/grpcvtctldserver/testutil/test_tmclient.go
+++ b/go/vt/vtctl/grpcvtctldserver/testutil/test_tmclient.go
@@ -627,7 +627,7 @@ func (fake *TabletManagerClient) RunHealthCheck(ctx context.Context, tablet *top
 }
 
 // SetReplicationSource is part of the tmclient.TabletManagerClient interface.
-func (fake *TabletManagerClient) SetReplicationSource(ctx context.Context, tablet *topodatapb.Tablet, parent *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool) error {
+func (fake *TabletManagerClient) SetReplicationSource(ctx context.Context, tablet *topodatapb.Tablet, parent *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool, semiSync bool) error {
 	if fake.SetReplicationSourceResults == nil {
 		return assert.AnError
 	}
diff --git a/go/vt/vtctl/reparentutil/emergency_reparenter.go b/go/vt/vtctl/reparentutil/emergency_reparenter.go
index ca4c17a8320..eeb2aa6f359 100644
--- a/go/vt/vtctl/reparentutil/emergency_reparenter.go
+++ b/go/vt/vtctl/reparentutil/emergency_reparenter.go
@@ -499,7 +499,7 @@ func (erp *EmergencyReparenter) reparentReplicas(
 			forceStart = fs
 		}
 
-		err := erp.tmc.SetReplicationSource(replCtx, ti.Tablet, newPrimaryTablet.Alias, 0, "", forceStart)
+		err := erp.tmc.SetReplicationSource(replCtx, ti.Tablet, newPrimaryTablet.Alias, 0, "", forceStart, ReplicaSemiSync(newPrimaryTablet, ti.Tablet))
 		if err != nil {
 			err = vterrors.Wrapf(err, "tablet %v SetReplicationSource failed: %v", alias, err)
 			rec.RecordError(err)
diff --git a/go/vt/vtctl/reparentutil/planned_reparenter.go b/go/vt/vtctl/reparentutil/planned_reparenter.go
index a12fc731ffe..94b5c049330 100644
--- a/go/vt/vtctl/reparentutil/planned_reparenter.go
+++ b/go/vt/vtctl/reparentutil/planned_reparenter.go
@@ -227,7 +227,7 @@ func (pr *PlannedReparenter) performGracefulPromotion(
 	setSourceCtx, setSourceCancel := context.WithTimeout(ctx, opts.WaitReplicasTimeout)
 	defer setSourceCancel()
 
-	if err := pr.tmc.SetReplicationSource(setSourceCtx, primaryElect, currentPrimary.Alias, 0, snapshotPos, true); err != nil {
+	if err := pr.tmc.SetReplicationSource(setSourceCtx, primaryElect, currentPrimary.Alias, 0, snapshotPos, true, ReplicaSemiSync(currentPrimary.Tablet, primaryElect)); err != nil {
 		return "", vterrors.Wrapf(err, "replication on primary-elect %v did not catch up in time; replication must be healthy to perform PlannedReparent", primaryElectAliasStr)
 	}
 
@@ -652,7 +652,7 @@ func (pr *PlannedReparenter) reparentTablets(
 			// that it needs to start replication after transitioning from
 			// PRIMARY => REPLICA.
 			forceStartReplication := false
-			if err := pr.tmc.SetReplicationSource(replCtx, tablet, ev.NewPrimary.Alias, reparentJournalTimestamp, "", forceStartReplication); err != nil {
+			if err := pr.tmc.SetReplicationSource(replCtx, tablet, ev.NewPrimary.Alias, reparentJournalTimestamp, "", forceStartReplication, ReplicaSemiSync(ev.NewPrimary, tablet)); err != nil {
 				rec.RecordError(vterrors.Wrapf(err, "tablet %v failed to SetReplicationSource(%v): %v", alias, primaryElectAliasStr, err))
 			}
 		}(alias, tabletInfo.Tablet)
diff --git a/go/vt/vttablet/faketmclient/fake_client.go b/go/vt/vttablet/faketmclient/fake_client.go
index 064fb448573..dac476ce4af 100644
--- a/go/vt/vttablet/faketmclient/fake_client.go
+++ b/go/vt/vttablet/faketmclient/fake_client.go
@@ -321,7 +321,7 @@ func (client *FakeTabletManagerClient) SetMaster(ctx context.Context, tablet *to
 }
 
 // SetReplicationSource is part of the tmclient.TabletManagerClient interface.
-func (client *FakeTabletManagerClient) SetReplicationSource(ctx context.Context, tablet *topodatapb.Tablet, parent *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool) error {
+func (client *FakeTabletManagerClient) SetReplicationSource(ctx context.Context, tablet *topodatapb.Tablet, parent *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool, semiSync bool) error {
 	return nil
 }
 
diff --git a/go/vt/vttablet/grpctmclient/client.go b/go/vt/vttablet/grpctmclient/client.go
index 890835ee1ab..4ca3ad7273d 100644
--- a/go/vt/vttablet/grpctmclient/client.go
+++ b/go/vt/vttablet/grpctmclient/client.go
@@ -895,7 +895,7 @@ func (client *Client) SetMaster(ctx context.Context, tablet *topodatapb.Tablet,
 }
 
 // SetReplicationSource is part of the tmclient.TabletManagerClient interface.
-func (client *Client) SetReplicationSource(ctx context.Context, tablet *topodatapb.Tablet, parent *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool) error {
+func (client *Client) SetReplicationSource(ctx context.Context, tablet *topodatapb.Tablet, parent *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool, semiSync bool) error {
 	c, closer, err := client.dialer.dial(ctx, tablet)
 	if err != nil {
 		return err
@@ -906,6 +906,7 @@ func (client *Client) SetReplicationSource(ctx context.Context, tablet *topodata
 		TimeCreatedNs:         timeCreatedNS,
 		WaitPosition:          waitPosition,
 		ForceStartReplication: forceStartReplication,
+		SemiSync:              semiSync,
 	})
 	return err
 }
diff --git a/go/vt/vttablet/grpctmserver/server.go b/go/vt/vttablet/grpctmserver/server.go
index 17399ab3eb7..ce6ea18b4d1 100644
--- a/go/vt/vttablet/grpctmserver/server.go
+++ b/go/vt/vttablet/grpctmserver/server.go
@@ -474,14 +474,14 @@ func (s *server) SetMaster(ctx context.Context, request *tabletmanagerdatapb.Set
 	defer s.tm.HandleRPCPanic(ctx, "SetMaster", request, response, true /*verbose*/, &err)
 	ctx = callinfo.GRPCCallInfo(ctx)
 	response = &tabletmanagerdatapb.SetReplicationSourceResponse{}
-	return response, s.tm.SetReplicationSource(ctx, request.Parent, request.TimeCreatedNs, request.WaitPosition, request.ForceStartReplication)
+	return response, s.tm.SetReplicationSource(ctx, request.Parent, request.TimeCreatedNs, request.WaitPosition, request.ForceStartReplication, request.GetSemiSync())
 }
 
 func (s *server) SetReplicationSource(ctx context.Context, request *tabletmanagerdatapb.SetReplicationSourceRequest) (response *tabletmanagerdatapb.SetReplicationSourceResponse, err error) {
 	defer s.tm.HandleRPCPanic(ctx, "SetReplicationSource", request, response, true /*verbose*/, &err)
 	ctx = callinfo.GRPCCallInfo(ctx)
 	response = &tabletmanagerdatapb.SetReplicationSourceResponse{}
-	return response, s.tm.SetReplicationSource(ctx, request.Parent, request.TimeCreatedNs, request.WaitPosition, request.ForceStartReplication)
+	return response, s.tm.SetReplicationSource(ctx, request.Parent, request.TimeCreatedNs, request.WaitPosition, request.ForceStartReplication, request.GetSemiSync())
 }
 
 func (s *server) ReplicaWasRestarted(ctx context.Context, request *tabletmanagerdatapb.ReplicaWasRestartedRequest) (response *tabletmanagerdatapb.ReplicaWasRestartedResponse, err error) {
diff --git a/go/vt/vttablet/tabletmanager/rpc_agent.go b/go/vt/vttablet/tabletmanager/rpc_agent.go
index efb8336447c..db6e506c3d6 100644
--- a/go/vt/vttablet/tabletmanager/rpc_agent.go
+++ b/go/vt/vttablet/tabletmanager/rpc_agent.go
@@ -137,7 +137,7 @@ type RPCTM interface {
 	// Deprecated, use SetReplicationSource instead
 	SetMaster(ctx context.Context, parent *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool) error
 
-	SetReplicationSource(ctx context.Context, parent *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool) error
+	SetReplicationSource(ctx context.Context, parent *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool, semiSync bool) error
 
 	StopReplicationAndGetStatus(ctx context.Context, stopReplicationMode replicationdatapb.StopReplicationMode) (StopReplicationAndGetStatusResponse, error)
 
diff --git a/go/vt/vttablet/tabletmanager/rpc_replication.go b/go/vt/vttablet/tabletmanager/rpc_replication.go
index 8096c63c7b4..ec742fd196b 100644
--- a/go/vt/vttablet/tabletmanager/rpc_replication.go
+++ b/go/vt/vttablet/tabletmanager/rpc_replication.go
@@ -539,8 +539,8 @@ func (tm *TabletManager) ReplicaWasPromoted(ctx context.Context) error {
 
 // SetReplicationSource sets replication primary, and waits for the
 // reparent_journal table entry up to context timeout
-func (tm *TabletManager) SetReplicationSource(ctx context.Context, parentAlias *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool) error {
-	log.Infof("SetReplicationSource: parent: %v  position: %v force: %v", parentAlias, waitPosition, forceStartReplication)
+func (tm *TabletManager) SetReplicationSource(ctx context.Context, parentAlias *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool, semiSync bool) error {
+	log.Infof("SetReplicationSource: parent: %v  position: %v force: %v semiSync: %v", parentAlias, waitPosition, forceStartReplication, semiSync)
 	if err := tm.lock(ctx); err != nil {
 		return err
 	}
@@ -548,12 +548,12 @@ func (tm *TabletManager) SetReplicationSource(ctx context.Context, parentAlias *
 
 	// setReplicationSourceLocked also fixes the semi-sync. In case the tablet type is primary it assumes that it will become a replica if SetReplicationSource
 	// is called, so we always call fixSemiSync with a non-primary tablet type. This will always set the source side replication to false.
-	return tm.setReplicationSourceLocked(ctx, parentAlias, timeCreatedNS, waitPosition, forceStartReplication)
+	return tm.setReplicationSourceLocked(ctx, parentAlias, timeCreatedNS, waitPosition, forceStartReplication, convertBoolToSemiSyncAction(semiSync))
 }
 
 // SetMaster is the old version of SetReplicationSource. Deprecated.
 func (tm *TabletManager) SetMaster(ctx context.Context, parentAlias *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool) error {
-	return tm.SetReplicationSource(ctx, parentAlias, timeCreatedNS, waitPosition, forceStartReplication)
+	return tm.SetReplicationSource(ctx, parentAlias, timeCreatedNS, waitPosition, forceStartReplication, false)
 }
 
 func (tm *TabletManager) setReplicationSourceRepairReplication(ctx context.Context, parentAlias *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool) (err error) {
@@ -569,10 +569,20 @@ func (tm *TabletManager) setReplicationSourceRepairReplication(ctx context.Conte
 
 	defer unlock(&err)
 
-	return tm.setReplicationSourceLocked(ctx, parentAlias, timeCreatedNS, waitPosition, forceStartReplication)
+	return tm.setReplicationSourceLocked(ctx, parentAlias, timeCreatedNS, waitPosition, forceStartReplication, SemiSyncActionNone)
+}
+
+func (tm *TabletManager) setReplicationSourceSemiSyncNoAction(ctx context.Context, parentAlias *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool) error {
+	log.Infof("SetReplicationSource: parent: %v  position: %v force: %v", parentAlias, waitPosition, forceStartReplication)
+	if err := tm.lock(ctx); err != nil {
+		return err
+	}
+	defer tm.unlock()
+
+	return tm.setReplicationSourceLocked(ctx, parentAlias, timeCreatedNS, waitPosition, forceStartReplication, SemiSyncActionNone)
 }
 
-func (tm *TabletManager) setReplicationSourceLocked(ctx context.Context, parentAlias *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool) (err error) {
+func (tm *TabletManager) setReplicationSourceLocked(ctx context.Context, parentAlias *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool, semiSync SemiSyncAction) (err error) {
 	// End orchestrator maintenance at the end of fixing replication.
 	// This is a best effort operation, so it should happen in a goroutine
 	defer func() {
@@ -630,7 +640,7 @@ func (tm *TabletManager) setReplicationSourceLocked(ctx context.Context, parentA
 	if tabletType == topodatapb.TabletType_PRIMARY {
 		tabletType = topodatapb.TabletType_REPLICA
 	}
-	if err := tm.fixSemiSync(tabletType, SemiSyncActionFalse); err != nil {
+	if err := tm.fixSemiSync(tabletType, semiSync); err != nil {
 		return err
 	}
 	// Update the primary/source address only if needed.
diff --git a/go/vt/vttablet/tabletmanager/shard_sync.go b/go/vt/vttablet/tabletmanager/shard_sync.go
index 66fb0661fbb..81e01fd6eef 100644
--- a/go/vt/vttablet/tabletmanager/shard_sync.go
+++ b/go/vt/vttablet/tabletmanager/shard_sync.go
@@ -238,7 +238,7 @@ func (tm *TabletManager) endPrimaryTerm(ctx context.Context, primaryAlias *topod
 			return err
 		}
 	} else {
-		if err := tm.SetReplicationSource(setPrimaryCtx, primaryAlias, 0, "", true); err != nil {
+		if err := tm.setReplicationSourceSemiSyncNoAction(setPrimaryCtx, primaryAlias, 0, "", true); err != nil {
 			return vterrors.Wrap(err, "failed to reparent self to new primary")
 		}
 	}
diff --git a/go/vt/vttablet/tmclient/rpc_client_api.go b/go/vt/vttablet/tmclient/rpc_client_api.go
index 19621be0312..fc3ca10badb 100644
--- a/go/vt/vttablet/tmclient/rpc_client_api.go
+++ b/go/vt/vttablet/tmclient/rpc_client_api.go
@@ -208,7 +208,7 @@ type TabletManagerClient interface {
 	// SetReplicationSource tells a tablet to start replicating from the
 	// passed in tablet alias, and wait for the row in the
 	// reparent_journal table (if timeCreatedNS is non-zero).
-	SetReplicationSource(ctx context.Context, tablet *topodatapb.Tablet, parent *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool) error
+	SetReplicationSource(ctx context.Context, tablet *topodatapb.Tablet, parent *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool, semiSync bool) error
 
 	// ReplicaWasRestarted tells the replica tablet its primary has changed
 	ReplicaWasRestarted(ctx context.Context, tablet *topodatapb.Tablet, parent *topodatapb.TabletAlias) error
diff --git a/go/vt/vttablet/tmrpctest/test_tm_rpc.go b/go/vt/vttablet/tmrpctest/test_tm_rpc.go
index efc0c4a5646..72a460927de 100644
--- a/go/vt/vttablet/tmrpctest/test_tm_rpc.go
+++ b/go/vt/vttablet/tmrpctest/test_tm_rpc.go
@@ -1107,7 +1107,7 @@ func tmRPCTestReplicaWasPromotedPanic(ctx context.Context, t *testing.T, client
 var testSetMasterCalled = false
 var testForceStartReplica = true
 
-func (fra *fakeRPCTM) SetReplicationSource(ctx context.Context, parent *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplica bool) error {
+func (fra *fakeRPCTM) SetReplicationSource(ctx context.Context, parent *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplica bool, semiSync bool) error {
 	if fra.panics {
 		panic(fmt.Errorf("test-triggered panic"))
 	}
diff --git a/proto/tabletmanagerdata.proto b/proto/tabletmanagerdata.proto
index d3f091aac4c..1cebb0e3620 100644
--- a/proto/tabletmanagerdata.proto
+++ b/proto/tabletmanagerdata.proto
@@ -415,6 +415,7 @@ message SetReplicationSourceRequest {
   int64 time_created_ns = 2;
   bool force_start_replication = 3;
   string wait_position = 4;
+  bool semiSync = 5;
 }
 
 message SetReplicationSourceResponse {
diff --git a/web/vtadmin/src/proto/vtadmin.d.ts b/web/vtadmin/src/proto/vtadmin.d.ts
index f3c714bd4d9..964ba996ce5 100644
--- a/web/vtadmin/src/proto/vtadmin.d.ts
+++ b/web/vtadmin/src/proto/vtadmin.d.ts
@@ -17836,6 +17836,9 @@ export namespace tabletmanagerdata {
 
         /** SetReplicationSourceRequest wait_position */
         wait_position?: (string|null);
+
+        /** SetReplicationSourceRequest semiSync */
+        semiSync?: (boolean|null);
     }
 
     /** Represents a SetReplicationSourceRequest. */
@@ -17859,6 +17862,9 @@ export namespace tabletmanagerdata {
         /** SetReplicationSourceRequest wait_position. */
         public wait_position: string;
 
+        /** SetReplicationSourceRequest semiSync. */
+        public semiSync: boolean;
+
         /**
          * Creates a new SetReplicationSourceRequest instance using the specified properties.
          * @param [properties] Properties to set
diff --git a/web/vtadmin/src/proto/vtadmin.js b/web/vtadmin/src/proto/vtadmin.js
index 6917c81b4e6..94937dbffa6 100644
--- a/web/vtadmin/src/proto/vtadmin.js
+++ b/web/vtadmin/src/proto/vtadmin.js
@@ -40323,6 +40323,7 @@ $root.tabletmanagerdata = (function() {
          * @property {number|Long|null} [time_created_ns] SetReplicationSourceRequest time_created_ns
          * @property {boolean|null} [force_start_replication] SetReplicationSourceRequest force_start_replication
          * @property {string|null} [wait_position] SetReplicationSourceRequest wait_position
+         * @property {boolean|null} [semiSync] SetReplicationSourceRequest semiSync
          */
 
         /**
@@ -40372,6 +40373,14 @@ $root.tabletmanagerdata = (function() {
          */
         SetReplicationSourceRequest.prototype.wait_position = "";
 
+        /**
+         * SetReplicationSourceRequest semiSync.
+         * @member {boolean} semiSync
+         * @memberof tabletmanagerdata.SetReplicationSourceRequest
+         * @instance
+         */
+        SetReplicationSourceRequest.prototype.semiSync = false;
+
         /**
          * Creates a new SetReplicationSourceRequest instance using the specified properties.
          * @function create
@@ -40404,6 +40413,8 @@ $root.tabletmanagerdata = (function() {
                 writer.uint32(/* id 3, wireType 0 =*/24).bool(message.force_start_replication);
             if (message.wait_position != null && Object.hasOwnProperty.call(message, "wait_position"))
                 writer.uint32(/* id 4, wireType 2 =*/34).string(message.wait_position);
+            if (message.semiSync != null && Object.hasOwnProperty.call(message, "semiSync"))
+                writer.uint32(/* id 5, wireType 0 =*/40).bool(message.semiSync);
             return writer;
         };
 
@@ -40450,6 +40461,9 @@ $root.tabletmanagerdata = (function() {
                 case 4:
                     message.wait_position = reader.string();
                     break;
+                case 5:
+                    message.semiSync = reader.bool();
+                    break;
                 default:
                     reader.skipType(tag & 7);
                     break;
@@ -40499,6 +40513,9 @@ $root.tabletmanagerdata = (function() {
             if (message.wait_position != null && message.hasOwnProperty("wait_position"))
                 if (!$util.isString(message.wait_position))
                     return "wait_position: string expected";
+            if (message.semiSync != null && message.hasOwnProperty("semiSync"))
+                if (typeof message.semiSync !== "boolean")
+                    return "semiSync: boolean expected";
             return null;
         };
 
@@ -40532,6 +40549,8 @@ $root.tabletmanagerdata = (function() {
                 message.force_start_replication = Boolean(object.force_start_replication);
             if (object.wait_position != null)
                 message.wait_position = String(object.wait_position);
+            if (object.semiSync != null)
+                message.semiSync = Boolean(object.semiSync);
             return message;
         };
 
@@ -40557,6 +40576,7 @@ $root.tabletmanagerdata = (function() {
                     object.time_created_ns = options.longs === String ? "0" : 0;
                 object.force_start_replication = false;
                 object.wait_position = "";
+                object.semiSync = false;
             }
             if (message.parent != null && message.hasOwnProperty("parent"))
                 object.parent = $root.topodata.TabletAlias.toObject(message.parent, options);
@@ -40569,6 +40589,8 @@ $root.tabletmanagerdata = (function() {
                 object.force_start_replication = message.force_start_replication;
             if (message.wait_position != null && message.hasOwnProperty("wait_position"))
                 object.wait_position = message.wait_position;
+            if (message.semiSync != null && message.hasOwnProperty("semiSync"))
+                object.semiSync = message.semiSync;
             return object;
         };
 

From 036dbb5498b5dcce7c4622b3b96d79d44b4793cd Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Mon, 17 Jan 2022 15:50:14 +0530
Subject: [PATCH 11/30] feat: change SetMaster rpc to allow passing in semiSync
 as a parameter

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 go/test/fuzzing/vttablet_fuzzer.go              | 2 +-
 go/vt/vtcombo/tablet_map.go                     | 2 +-
 go/vt/vttablet/faketmclient/fake_client.go      | 2 +-
 go/vt/vttablet/grpctmclient/client.go           | 3 ++-
 go/vt/vttablet/tabletmanager/rpc_agent.go       | 2 +-
 go/vt/vttablet/tabletmanager/rpc_replication.go | 4 ++--
 go/vt/vttablet/tmclient/rpc_client_api.go       | 2 +-
 go/vt/vttablet/tmrpctest/test_tm_rpc.go         | 6 +++---
 8 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/go/test/fuzzing/vttablet_fuzzer.go b/go/test/fuzzing/vttablet_fuzzer.go
index 77f20b77a94..31231b1549c 100644
--- a/go/test/fuzzing/vttablet_fuzzer.go
+++ b/go/test/fuzzing/vttablet_fuzzer.go
@@ -562,7 +562,7 @@ func (fs *fuzzStore) callSetMaster() error {
 	if err != nil {
 		return err
 	}
-	_ = fs.client.SetMaster(context.Background(), tablet, parent, int64(timeCreatedNS), pos, false)
+	_ = fs.client.SetMaster(context.Background(), tablet, parent, int64(timeCreatedNS), pos, false, false)
 	return nil
 }
 
diff --git a/go/vt/vtcombo/tablet_map.go b/go/vt/vtcombo/tablet_map.go
index 7c97c6e7d8b..01ca14e9015 100644
--- a/go/vt/vtcombo/tablet_map.go
+++ b/go/vt/vtcombo/tablet_map.go
@@ -957,7 +957,7 @@ func (itmc *internalTabletManagerClient) UndoDemotePrimary(context.Context, *top
 	return fmt.Errorf("not implemented in vtcombo")
 }
 
-func (itmc *internalTabletManagerClient) SetMaster(context.Context, *topodatapb.Tablet, *topodatapb.TabletAlias, int64, string, bool) error {
+func (itmc *internalTabletManagerClient) SetMaster(context.Context, *topodatapb.Tablet, *topodatapb.TabletAlias, int64, string, bool, bool) error {
 	return fmt.Errorf("not implemented in vtcombo")
 }
 
diff --git a/go/vt/vttablet/faketmclient/fake_client.go b/go/vt/vttablet/faketmclient/fake_client.go
index dac476ce4af..91b90ca031d 100644
--- a/go/vt/vttablet/faketmclient/fake_client.go
+++ b/go/vt/vttablet/faketmclient/fake_client.go
@@ -316,7 +316,7 @@ func (client *FakeTabletManagerClient) UndoDemotePrimary(ctx context.Context, ta
 }
 
 // SetMaster is part of the tmclient.TabletManagerClient interface.
-func (client *FakeTabletManagerClient) SetMaster(ctx context.Context, tablet *topodatapb.Tablet, parent *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool) error {
+func (client *FakeTabletManagerClient) SetMaster(ctx context.Context, tablet *topodatapb.Tablet, parent *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool, semiSync bool) error {
 	return nil
 }
 
diff --git a/go/vt/vttablet/grpctmclient/client.go b/go/vt/vttablet/grpctmclient/client.go
index 4ca3ad7273d..36ee4187689 100644
--- a/go/vt/vttablet/grpctmclient/client.go
+++ b/go/vt/vttablet/grpctmclient/client.go
@@ -879,7 +879,7 @@ func (client *Client) ReplicaWasPromoted(ctx context.Context, tablet *topodatapb
 }
 
 // SetMaster is part of the tmclient.TabletManagerClient interface.
-func (client *Client) SetMaster(ctx context.Context, tablet *topodatapb.Tablet, parent *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool) error {
+func (client *Client) SetMaster(ctx context.Context, tablet *topodatapb.Tablet, parent *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool, semiSync bool) error {
 	c, closer, err := client.dialer.dial(ctx, tablet)
 	if err != nil {
 		return err
@@ -890,6 +890,7 @@ func (client *Client) SetMaster(ctx context.Context, tablet *topodatapb.Tablet,
 		TimeCreatedNs:         timeCreatedNS,
 		WaitPosition:          waitPosition,
 		ForceStartReplication: forceStartReplication,
+		SemiSync:              semiSync,
 	})
 	return err
 }
diff --git a/go/vt/vttablet/tabletmanager/rpc_agent.go b/go/vt/vttablet/tabletmanager/rpc_agent.go
index db6e506c3d6..7c144d0c00b 100644
--- a/go/vt/vttablet/tabletmanager/rpc_agent.go
+++ b/go/vt/vttablet/tabletmanager/rpc_agent.go
@@ -135,7 +135,7 @@ type RPCTM interface {
 	ReplicaWasPromoted(ctx context.Context) error
 
 	// Deprecated, use SetReplicationSource instead
-	SetMaster(ctx context.Context, parent *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool) error
+	SetMaster(ctx context.Context, parent *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool, semiSync bool) error
 
 	SetReplicationSource(ctx context.Context, parent *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool, semiSync bool) error
 
diff --git a/go/vt/vttablet/tabletmanager/rpc_replication.go b/go/vt/vttablet/tabletmanager/rpc_replication.go
index ec742fd196b..5191915a803 100644
--- a/go/vt/vttablet/tabletmanager/rpc_replication.go
+++ b/go/vt/vttablet/tabletmanager/rpc_replication.go
@@ -552,8 +552,8 @@ func (tm *TabletManager) SetReplicationSource(ctx context.Context, parentAlias *
 }
 
 // SetMaster is the old version of SetReplicationSource. Deprecated.
-func (tm *TabletManager) SetMaster(ctx context.Context, parentAlias *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool) error {
-	return tm.SetReplicationSource(ctx, parentAlias, timeCreatedNS, waitPosition, forceStartReplication, false)
+func (tm *TabletManager) SetMaster(ctx context.Context, parentAlias *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool, semiSync bool) error {
+	return tm.SetReplicationSource(ctx, parentAlias, timeCreatedNS, waitPosition, forceStartReplication, semiSync)
 }
 
 func (tm *TabletManager) setReplicationSourceRepairReplication(ctx context.Context, parentAlias *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool) (err error) {
diff --git a/go/vt/vttablet/tmclient/rpc_client_api.go b/go/vt/vttablet/tmclient/rpc_client_api.go
index fc3ca10badb..3709df3e72e 100644
--- a/go/vt/vttablet/tmclient/rpc_client_api.go
+++ b/go/vt/vttablet/tmclient/rpc_client_api.go
@@ -203,7 +203,7 @@ type TabletManagerClient interface {
 	// Deprecated SetMaster tells a tablet to start replicating from the
 	// passed in primary tablet alias, and wait for the row in the
 	// reparent_journal table (if timeCreatedNS is non-zero).
-	SetMaster(ctx context.Context, tablet *topodatapb.Tablet, parent *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool) error
+	SetMaster(ctx context.Context, tablet *topodatapb.Tablet, parent *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplication bool, semiSync bool) error
 
 	// SetReplicationSource tells a tablet to start replicating from the
 	// passed in tablet alias, and wait for the row in the
diff --git a/go/vt/vttablet/tmrpctest/test_tm_rpc.go b/go/vt/vttablet/tmrpctest/test_tm_rpc.go
index 72a460927de..cb17bd14ec5 100644
--- a/go/vt/vttablet/tmrpctest/test_tm_rpc.go
+++ b/go/vt/vttablet/tmrpctest/test_tm_rpc.go
@@ -1120,7 +1120,7 @@ func (fra *fakeRPCTM) SetReplicationSource(ctx context.Context, parent *topodata
 }
 
 // Deprecated
-func (fra *fakeRPCTM) SetMaster(ctx context.Context, parent *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplica bool) error {
+func (fra *fakeRPCTM) SetMaster(ctx context.Context, parent *topodatapb.TabletAlias, timeCreatedNS int64, waitPosition string, forceStartReplica bool, semiSync bool) error {
 	if fra.panics {
 		panic(fmt.Errorf("test-triggered panic"))
 	}
@@ -1133,12 +1133,12 @@ func (fra *fakeRPCTM) SetMaster(ctx context.Context, parent *topodatapb.TabletAl
 }
 
 func tmRPCTestSetMaster(ctx context.Context, t *testing.T, client tmclient.TabletManagerClient, tablet *topodatapb.Tablet) {
-	err := client.SetMaster(ctx, tablet, testPrimaryAlias, testTimeCreatedNS, testWaitPosition, testForceStartReplica)
+	err := client.SetMaster(ctx, tablet, testPrimaryAlias, testTimeCreatedNS, testWaitPosition, testForceStartReplica, false)
 	compareError(t, "SetMaster", err, true, testSetMasterCalled)
 }
 
 func tmRPCTestSetMasterPanic(ctx context.Context, t *testing.T, client tmclient.TabletManagerClient, tablet *topodatapb.Tablet) {
-	err := client.SetMaster(ctx, tablet, testPrimaryAlias, testTimeCreatedNS, testWaitPosition, testForceStartReplica)
+	err := client.SetMaster(ctx, tablet, testPrimaryAlias, testTimeCreatedNS, testWaitPosition, testForceStartReplica, false)
 	expectHandleRPCPanic(t, "SetMaster", true /*verbose*/, err)
 }
 

From bad3a0cd66f3b4197dcc158411ce7d4b3b9cb959 Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Wed, 19 Jan 2022 16:48:55 +0530
Subject: [PATCH 12/30] feat: fix startReplication to not change semi-sync
 settings

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 go/vt/vttablet/tabletmanager/restore.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/go/vt/vttablet/tabletmanager/restore.go b/go/vt/vttablet/tabletmanager/restore.go
index d5f30f39ff9..ccc1b0f68d8 100644
--- a/go/vt/vttablet/tabletmanager/restore.go
+++ b/go/vt/vttablet/tabletmanager/restore.go
@@ -527,7 +527,7 @@ func (tm *TabletManager) startReplication(ctx context.Context, pos mysql.Positio
 	}
 
 	// If using semi-sync, we need to enable it before connecting to primary.
-	if err := tm.fixSemiSync(tabletType, SemiSyncActionFalse); err != nil {
+	if err := tm.fixSemiSync(tabletType, SemiSyncActionNone); err != nil {
 		return err
 	}
 

From 1f83942eecc5d29e9e76ee268f6bc2e1566281fb Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Wed, 19 Jan 2022 17:18:50 +0530
Subject: [PATCH 13/30] test: pass correct durability flag to vtctld in
 reparent tests

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 go/test/endtoend/reparent/utils/utils.go | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/go/test/endtoend/reparent/utils/utils.go b/go/test/endtoend/reparent/utils/utils.go
index c3171cc03cf..f8c18c5e8ad 100644
--- a/go/test/endtoend/reparent/utils/utils.go
+++ b/go/test/endtoend/reparent/utils/utils.go
@@ -82,6 +82,14 @@ func setupCluster(ctx context.Context, t *testing.T, shardName string, cells []s
 	var tablets []*cluster.Vttablet
 	clusterInstance := cluster.NewCluster(cells[0], Hostname)
 	keyspace := &cluster.Keyspace{Name: KeyspaceName}
+
+	if enableSemiSync {
+		clusterInstance.VtTabletExtraArgs = append(clusterInstance.VtTabletExtraArgs, "-enable_semi_sync")
+		if clusterInstance.VtctlMajorVersion >= 13 {
+			clusterInstance.VtctldExtraArgs = append(clusterInstance.VtctldExtraArgs, "-durability=semi_sync")
+		}
+	}
+
 	// Start topo server
 	err := clusterInstance.StartTopo()
 	if err != nil {
@@ -115,7 +123,7 @@ func setupCluster(ctx context.Context, t *testing.T, shardName string, cells []s
 	shard := &cluster.Shard{Name: shardName}
 	shard.Vttablets = tablets
 
-	clusterInstance.VtTabletExtraArgs = []string{
+	clusterInstance.VtTabletExtraArgs = append(clusterInstance.VtTabletExtraArgs,
 		"-lock_tables_timeout", "5s",
 		"-init_populate_metadata",
 		"-track_schema_versions=true",
@@ -125,8 +133,7 @@ func setupCluster(ctx context.Context, t *testing.T, shardName string, cells []s
 		// In this case, the close method and initSchema method of the onlineDDL executor race.
 		// If the initSchema acquires the lock, then it takes about 30 seconds for it to run during which time the
 		// DemotePrimary rpc is stalled!
-		"-queryserver_enable_online_ddl=false",
-	}
+		"-queryserver_enable_online_ddl=false")
 	if enableSemiSync {
 		clusterInstance.VtTabletExtraArgs = append(clusterInstance.VtTabletExtraArgs, "-enable_semi_sync")
 	}
@@ -304,7 +311,7 @@ func ErsIgnoreTablet(clusterInstance *cluster.LocalProcessCluster, tab *cluster.
 
 // ErsWithVtctl runs ERS via vtctl binary
 func ErsWithVtctl(clusterInstance *cluster.LocalProcessCluster) (string, error) {
-	args := []string{"EmergencyReparentShard", "-keyspace_shard", fmt.Sprintf("%s/%s", KeyspaceName, ShardName)}
+	args := []string{"-durability=semi_sync", "EmergencyReparentShard", "-keyspace_shard", fmt.Sprintf("%s/%s", KeyspaceName, ShardName)}
 	return clusterInstance.VtctlProcess.ExecuteCommandWithOutput(args...)
 }
 

From f6ea84a222bf19fbbe2b235973cb90854e2672c4 Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Sat, 22 Jan 2022 15:12:37 +0530
Subject: [PATCH 14/30] feat: fix changeTypeLocked to allow passing semiSync as
 a parameter

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 go/vt/orchestrator/inst/tablet_dao.go         |   8 +-
 .../tabletmanagerdata/tabletmanagerdata.pb.go | 632 +++++++++---------
 .../tabletmanagerdata_vtproto.pb.go           |  33 +
 go/vt/vtcombo/tablet_map.go                   |   7 +-
 go/vt/vtctl/grpcvtctldserver/server.go        |  26 +-
 .../testutil/test_tmclient.go                 |   2 +-
 go/vt/vtgr/controller/mock_refresh.go         |   2 +-
 go/vt/vtgr/controller/refresh.go              |   2 +-
 go/vt/vtgr/controller/repair.go               |   4 +-
 go/vt/vttablet/faketmclient/fake_client.go    |   2 +-
 go/vt/vttablet/grpctmclient/client.go         |   3 +-
 go/vt/vttablet/grpctmserver/server.go         |   2 +-
 go/vt/vttablet/tabletmanager/rpc_actions.go   |   8 +-
 go/vt/vttablet/tabletmanager/rpc_agent.go     |   2 +-
 go/vt/vttablet/tabletmanager/rpc_backup.go    |   4 +-
 .../vttablet/tabletmanager/rpc_replication.go |  12 +-
 go/vt/vttablet/tabletmanager/shard_sync.go    |   2 +-
 go/vt/vttablet/tmclient/rpc_client_api.go     |   2 +-
 go/vt/vttablet/tmrpctest/test_tm_rpc.go       |   6 +-
 go/vt/worker/split_clone_flaky_test.go        |   2 +-
 go/vt/worker/utils_test.go                    |   2 +-
 go/vt/wrangler/cleaner.go                     |   2 +-
 go/vt/wrangler/reparent.go                    |   2 +-
 go/vt/wrangler/tablet.go                      |  35 +-
 proto/tabletmanagerdata.proto                 |   1 +
 web/vtadmin/src/proto/vtadmin.d.ts            |   6 +
 web/vtadmin/src/proto/vtadmin.js              |  25 +-
 27 files changed, 484 insertions(+), 350 deletions(-)

diff --git a/go/vt/orchestrator/inst/tablet_dao.go b/go/vt/orchestrator/inst/tablet_dao.go
index 448d6f0b52b..51b1f2fdc17 100644
--- a/go/vt/orchestrator/inst/tablet_dao.go
+++ b/go/vt/orchestrator/inst/tablet_dao.go
@@ -46,7 +46,7 @@ var ErrTabletAliasNil = errors.New("tablet alias is nil")
 // The proactive propagation allows a competing Orchestrator from discovering
 // the successful action of a previous one, which reduces churn.
 func SwitchPrimary(newPrimaryKey, oldPrimaryKey InstanceKey) error {
-	newPrimaryTablet, err := ChangeTabletType(newPrimaryKey, topodatapb.TabletType_PRIMARY)
+	newPrimaryTablet, err := ChangeTabletType(newPrimaryKey, topodatapb.TabletType_PRIMARY, SemiSyncAckers(newPrimaryKey) > 0)
 	if err != nil {
 		return err
 	}
@@ -80,7 +80,7 @@ func SwitchPrimary(newPrimaryKey, oldPrimaryKey InstanceKey) error {
 		log.Errore(err)
 		return nil
 	}
-	if _, err := ChangeTabletType(oldPrimaryKey, topodatapb.TabletType_REPLICA); err != nil {
+	if _, err := ChangeTabletType(oldPrimaryKey, topodatapb.TabletType_REPLICA, ReplicaSemiSync(newPrimaryKey, oldPrimaryKey)); err != nil {
 		// This is best effort.
 		log.Errore(err)
 	}
@@ -88,7 +88,7 @@ func SwitchPrimary(newPrimaryKey, oldPrimaryKey InstanceKey) error {
 }
 
 // ChangeTabletType designates the tablet that owns an instance as the primary.
-func ChangeTabletType(instanceKey InstanceKey, tabletType topodatapb.TabletType) (*topodatapb.Tablet, error) {
+func ChangeTabletType(instanceKey InstanceKey, tabletType topodatapb.TabletType, semiSync bool) (*topodatapb.Tablet, error) {
 	if instanceKey.Hostname == "" {
 		return nil, errors.New("can't set tablet to primary: instance is unspecified")
 	}
@@ -99,7 +99,7 @@ func ChangeTabletType(instanceKey InstanceKey, tabletType topodatapb.TabletType)
 	tmc := tmclient.NewTabletManagerClient()
 	tmcCtx, tmcCancel := context.WithTimeout(context.Background(), *topo.RemoteOperationTimeout)
 	defer tmcCancel()
-	if err := tmc.ChangeType(tmcCtx, tablet, tabletType); err != nil {
+	if err := tmc.ChangeType(tmcCtx, tablet, tabletType, semiSync); err != nil {
 		return nil, err
 	}
 	tsCtx, tsCancel := context.WithTimeout(context.Background(), *topo.RemoteOperationTimeout)
diff --git a/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go b/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go
index 850d25dea9f..257e3b3c6b6 100644
--- a/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go
+++ b/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go
@@ -1138,6 +1138,7 @@ type ChangeTypeRequest struct {
 	unknownFields protoimpl.UnknownFields
 
 	TabletType topodata.TabletType `protobuf:"varint,1,opt,name=tablet_type,json=tabletType,proto3,enum=topodata.TabletType" json:"tablet_type,omitempty"`
+	SemiSync   bool                `protobuf:"varint,2,opt,name=semiSync,proto3" json:"semiSync,omitempty"`
 }
 
 func (x *ChangeTypeRequest) Reset() {
@@ -1179,6 +1180,13 @@ func (x *ChangeTypeRequest) GetTabletType() topodata.TabletType {
 	return topodata.TabletType(0)
 }
 
+func (x *ChangeTypeRequest) GetSemiSync() bool {
+	if x != nil {
+		return x.SemiSync
+	}
+	return false
+}
+
 type ChangeTypeResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -4849,329 +4857,331 @@ var file_tabletmanagerdata_proto_rawDesc = []byte{
 	0x64, 0x4f, 0x6e, 0x6c, 0x79, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22, 0x15, 0x0a,
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+	0x72, 0x69, 0x74, 0x65, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22, 0x66, 0x0a, 0x11,
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+	0x01, 0x28, 0x09, 0x52, 0x05, 0x71, 0x75, 0x65, 0x72, 0x79, 0x12, 0x1a, 0x0a, 0x08, 0x77, 0x6f,
+	0x72, 0x6b, 0x66, 0x6c, 0x6f, 0x77, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x08, 0x77, 0x6f,
+	0x72, 0x6b, 0x66, 0x6c, 0x6f, 0x77, 0x12, 0x1a, 0x0a, 0x08, 0x6b, 0x65, 0x79, 0x73, 0x70, 0x61,
+	0x63, 0x65, 0x18, 0x03, 0x20, 0x01, 0x28, 0x09, 0x52, 0x08, 0x6b, 0x65, 0x79, 0x73, 0x70, 0x61,
+	0x63, 0x65, 0x22, 0x3b, 0x0a, 0x0d, 0x56, 0x45, 0x78, 0x65, 0x63, 0x52, 0x65, 0x73, 0x70, 0x6f,
+	0x6e, 0x73, 0x65, 0x12, 0x2a, 0x0a, 0x06, 0x72, 0x65, 0x73, 0x75, 0x6c, 0x74, 0x18, 0x01, 0x20,
+	0x01, 0x28, 0x0b, 0x32, 0x12, 0x2e, 0x71, 0x75, 0x65, 0x72, 0x79, 0x2e, 0x51, 0x75, 0x65, 0x72,
+	0x79, 0x52, 0x65, 0x73, 0x75, 0x6c, 0x74, 0x52, 0x06, 0x72, 0x65, 0x73, 0x75, 0x6c, 0x74, 0x42,
+	0x30, 0x5a, 0x2e, 0x76, 0x69, 0x74, 0x65, 0x73, 0x73, 0x2e, 0x69, 0x6f, 0x2f, 0x76, 0x69, 0x74,
+	0x65, 0x73, 0x73, 0x2f, 0x67, 0x6f, 0x2f, 0x76, 0x74, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f,
+	0x74, 0x61, 0x62, 0x6c, 0x65, 0x74, 0x6d, 0x61, 0x6e, 0x61, 0x67, 0x65, 0x72, 0x64, 0x61, 0x74,
+	0x61, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go b/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go
index d855c8b1d44..408228be1a3 100644
--- a/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go
+++ b/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go
@@ -1043,6 +1043,16 @@ func (m *ChangeTypeRequest) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
+	if m.SemiSync {
+		i--
+		if m.SemiSync {
+			dAtA[i] = 1
+		} else {
+			dAtA[i] = 0
+		}
+		i--
+		dAtA[i] = 0x10
+	}
 	if m.TabletType != 0 {
 		i = encodeVarint(dAtA, i, uint64(m.TabletType))
 		i--
@@ -4584,6 +4594,9 @@ func (m *ChangeTypeRequest) SizeVT() (n int) {
 	if m.TabletType != 0 {
 		n += 1 + sov(uint64(m.TabletType))
 	}
+	if m.SemiSync {
+		n += 2
+	}
 	if m.unknownFields != nil {
 		n += len(m.unknownFields)
 	}
@@ -8270,6 +8283,26 @@ func (m *ChangeTypeRequest) UnmarshalVT(dAtA []byte) error {
 					break
 				}
 			}
+		case 2:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field SemiSync", wireType)
+			}
+			var v int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				v |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			m.SemiSync = bool(v != 0)
 		default:
 			iNdEx = preIndex
 			skippy, err := skip(dAtA[iNdEx:])
diff --git a/go/vt/vtcombo/tablet_map.go b/go/vt/vtcombo/tablet_map.go
index 01ca14e9015..754d15d2af2 100644
--- a/go/vt/vtcombo/tablet_map.go
+++ b/go/vt/vtcombo/tablet_map.go
@@ -124,7 +124,8 @@ func CreateTablet(
 	}
 
 	if tabletType == topodatapb.TabletType_PRIMARY {
-		if err := tm.ChangeType(ctx, topodatapb.TabletType_PRIMARY); err != nil {
+		// Semi-sync has to be set to false, since we have 1 single backing MySQL
+		if err := tm.ChangeType(ctx, topodatapb.TabletType_PRIMARY /* semi-sync */, false); err != nil {
 			return fmt.Errorf("TabletExternallyReparented failed on primary %v: %v", topoproto.TabletAliasString(alias), err)
 		}
 	}
@@ -805,12 +806,12 @@ func (itmc *internalTabletManagerClient) SetReadWrite(ctx context.Context, table
 	return fmt.Errorf("not implemented in vtcombo")
 }
 
-func (itmc *internalTabletManagerClient) ChangeType(ctx context.Context, tablet *topodatapb.Tablet, dbType topodatapb.TabletType) error {
+func (itmc *internalTabletManagerClient) ChangeType(ctx context.Context, tablet *topodatapb.Tablet, dbType topodatapb.TabletType, semiSync bool) error {
 	t, ok := tabletMap[tablet.Alias.Uid]
 	if !ok {
 		return fmt.Errorf("tmclient: cannot find tablet %v", tablet.Alias.Uid)
 	}
-	t.tm.ChangeType(ctx, dbType)
+	t.tm.ChangeType(ctx, dbType, semiSync)
 	return nil
 }
 
diff --git a/go/vt/vtctl/grpcvtctldserver/server.go b/go/vt/vtctl/grpcvtctldserver/server.go
index 6a881ff652c..7b5469d0acf 100644
--- a/go/vt/vtctl/grpcvtctldserver/server.go
+++ b/go/vt/vtctl/grpcvtctldserver/server.go
@@ -260,7 +260,29 @@ func (s *VtctldServer) ChangeTabletType(ctx context.Context, req *vtctldatapb.Ch
 		}, nil
 	}
 
-	err = s.tmc.ChangeType(ctx, tablet.Tablet, req.DbType)
+	shard, err := s.ts.GetShard(ctx, tablet.Keyspace, tablet.Shard)
+	if err != nil {
+		return nil, err
+	}
+
+	if !shard.HasPrimary() {
+		return nil, vterrors.Errorf(vtrpc.Code_FAILED_PRECONDITION, "no primary tablet for shard %v/%v", tablet.Keyspace, tablet.Shard)
+	}
+
+	shardPrimary, err := s.ts.GetTablet(ctx, shard.PrimaryAlias)
+	if err != nil {
+		return nil, fmt.Errorf("cannot lookup primary tablet %v for shard %v/%v: %w", topoproto.TabletAliasString(shard.PrimaryAlias), tablet.Keyspace, tablet.Shard, err)
+	}
+
+	if shardPrimary.Type != topodatapb.TabletType_PRIMARY {
+		return nil, vterrors.Errorf(vtrpc.Code_FAILED_PRECONDITION, "TopologyServer has incosistent state for shard primary %v", topoproto.TabletAliasString(shard.PrimaryAlias))
+	}
+
+	if shardPrimary.Keyspace != tablet.Keyspace || shardPrimary.Shard != tablet.Shard {
+		return nil, vterrors.Errorf(vtrpc.Code_FAILED_PRECONDITION, "primary %v and potential replica %v not in same keypace shard (%v/%v)", topoproto.TabletAliasString(shard.PrimaryAlias), req.TabletAlias, tablet.Keyspace, tablet.Shard)
+	}
+
+	err = s.tmc.ChangeType(ctx, tablet.Tablet, req.DbType, reparentutil.ReplicaSemiSync(shardPrimary.Tablet, tablet.Tablet))
 	if err != nil {
 		return nil, err
 	}
@@ -2429,7 +2451,7 @@ func (s *VtctldServer) TabletExternallyReparented(ctx context.Context, req *vtct
 
 	event.DispatchUpdate(ev, "starting external reparent")
 
-	if err := s.tmc.ChangeType(ctx, tablet.Tablet, topodatapb.TabletType_PRIMARY); err != nil {
+	if err := s.tmc.ChangeType(ctx, tablet.Tablet, topodatapb.TabletType_PRIMARY, reparentutil.SemiSyncAckers(tablet.Tablet) > 0); err != nil {
 		log.Warningf("ChangeType(%v, PRIMARY): %v", topoproto.TabletAliasString(req.Tablet), err)
 		return nil, err
 	}
diff --git a/go/vt/vtctl/grpcvtctldserver/testutil/test_tmclient.go b/go/vt/vtctl/grpcvtctldserver/testutil/test_tmclient.go
index 3e9a9cfef47..57186e2de99 100644
--- a/go/vt/vtctl/grpcvtctldserver/testutil/test_tmclient.go
+++ b/go/vt/vtctl/grpcvtctldserver/testutil/test_tmclient.go
@@ -261,7 +261,7 @@ type TabletManagerClient struct {
 }
 
 // ChangeType is part of the tmclient.TabletManagerClient interface.
-func (fake *TabletManagerClient) ChangeType(ctx context.Context, tablet *topodatapb.Tablet, newType topodatapb.TabletType) error {
+func (fake *TabletManagerClient) ChangeType(ctx context.Context, tablet *topodatapb.Tablet, newType topodatapb.TabletType, semiSync bool) error {
 	if result, ok := fake.ChangeTabletTypeResult[topoproto.TabletAliasString(tablet.Alias)]; ok {
 		return result
 	}
diff --git a/go/vt/vtgr/controller/mock_refresh.go b/go/vt/vtgr/controller/mock_refresh.go
index 01a3a097c07..c7329d7138e 100644
--- a/go/vt/vtgr/controller/mock_refresh.go
+++ b/go/vt/vtgr/controller/mock_refresh.go
@@ -120,7 +120,7 @@ func (m *MockGRTmcClient) EXPECT() *MockGRTmcClientMockRecorder {
 }
 
 // ChangeType mocks base method.
-func (m *MockGRTmcClient) ChangeType(ctx context.Context, tablet *topodata.Tablet, dbType topodata.TabletType) error {
+func (m *MockGRTmcClient) ChangeType(ctx context.Context, tablet *topodata.Tablet, dbType topodata.TabletType, semiSync bool) error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "ChangeType", ctx, tablet, dbType)
 	ret0, _ := ret[0].(error)
diff --git a/go/vt/vtgr/controller/refresh.go b/go/vt/vtgr/controller/refresh.go
index 468fd2bb6e9..6f597729118 100644
--- a/go/vt/vtgr/controller/refresh.go
+++ b/go/vt/vtgr/controller/refresh.go
@@ -60,7 +60,7 @@ type GRTopo interface {
 
 // GRTmcClient is VTGR wrapper for tmc client
 type GRTmcClient interface {
-	ChangeType(ctx context.Context, tablet *topodatapb.Tablet, dbType topodatapb.TabletType) error
+	ChangeType(ctx context.Context, tablet *topodatapb.Tablet, dbType topodatapb.TabletType, semiSync bool) error
 	Ping(ctx context.Context, tablet *topodatapb.Tablet) error
 }
 
diff --git a/go/vt/vtgr/controller/repair.go b/go/vt/vtgr/controller/repair.go
index da8e7133c09..d2d508b1ea0 100644
--- a/go/vt/vtgr/controller/repair.go
+++ b/go/vt/vtgr/controller/repair.go
@@ -473,7 +473,7 @@ func (shard *GRShard) fixPrimaryTabletLocked(ctx context.Context) error {
 	if err := shard.checkShardLocked(ctx); err != nil {
 		return err
 	}
-	err := shard.tmc.ChangeType(ctx, candidate.tablet, topodatapb.TabletType_PRIMARY)
+	err := shard.tmc.ChangeType(ctx, candidate.tablet, topodatapb.TabletType_PRIMARY, false)
 	if err != nil {
 		return fmt.Errorf("failed to change type to primary on %v: %v", candidate.alias, err)
 	}
@@ -674,7 +674,7 @@ func (shard *GRShard) failoverLocked(ctx context.Context) error {
 	if err := shard.checkShardLocked(ctx); err != nil {
 		return err
 	}
-	err = shard.tmc.ChangeType(ctx, candidate.tablet, topodatapb.TabletType_PRIMARY)
+	err = shard.tmc.ChangeType(ctx, candidate.tablet, topodatapb.TabletType_PRIMARY, false)
 	if err != nil {
 		shard.logger.Errorf("Failed to failover Vitess %v", candidate.alias)
 		return err
diff --git a/go/vt/vttablet/faketmclient/fake_client.go b/go/vt/vttablet/faketmclient/fake_client.go
index 91b90ca031d..053e4f1bb45 100644
--- a/go/vt/vttablet/faketmclient/fake_client.go
+++ b/go/vt/vttablet/faketmclient/fake_client.go
@@ -118,7 +118,7 @@ func (client *FakeTabletManagerClient) SetReadWrite(ctx context.Context, tablet
 }
 
 // ChangeType is part of the tmclient.TabletManagerClient interface.
-func (client *FakeTabletManagerClient) ChangeType(ctx context.Context, tablet *topodatapb.Tablet, dbType topodatapb.TabletType) error {
+func (client *FakeTabletManagerClient) ChangeType(ctx context.Context, tablet *topodatapb.Tablet, dbType topodatapb.TabletType, semiSync bool) error {
 	return nil
 }
 
diff --git a/go/vt/vttablet/grpctmclient/client.go b/go/vt/vttablet/grpctmclient/client.go
index 1332b347c92..b4b4ca329a5 100644
--- a/go/vt/vttablet/grpctmclient/client.go
+++ b/go/vt/vttablet/grpctmclient/client.go
@@ -290,7 +290,7 @@ func (client *Client) SetReadWrite(ctx context.Context, tablet *topodatapb.Table
 }
 
 // ChangeType is part of the tmclient.TabletManagerClient interface.
-func (client *Client) ChangeType(ctx context.Context, tablet *topodatapb.Tablet, dbType topodatapb.TabletType) error {
+func (client *Client) ChangeType(ctx context.Context, tablet *topodatapb.Tablet, dbType topodatapb.TabletType, semiSync bool) error {
 	c, closer, err := client.dialer.dial(ctx, tablet)
 	if err != nil {
 		return err
@@ -298,6 +298,7 @@ func (client *Client) ChangeType(ctx context.Context, tablet *topodatapb.Tablet,
 	defer closer.Close()
 	_, err = c.ChangeType(ctx, &tabletmanagerdatapb.ChangeTypeRequest{
 		TabletType: dbType,
+		SemiSync:   semiSync,
 	})
 	return err
 }
diff --git a/go/vt/vttablet/grpctmserver/server.go b/go/vt/vttablet/grpctmserver/server.go
index 249c4c6920c..9c5fd232323 100644
--- a/go/vt/vttablet/grpctmserver/server.go
+++ b/go/vt/vttablet/grpctmserver/server.go
@@ -119,7 +119,7 @@ func (s *server) ChangeType(ctx context.Context, request *tabletmanagerdatapb.Ch
 	defer s.tm.HandleRPCPanic(ctx, "ChangeType", request, response, true /*verbose*/, &err)
 	ctx = callinfo.GRPCCallInfo(ctx)
 	response = &tabletmanagerdatapb.ChangeTypeResponse{}
-	return response, s.tm.ChangeType(ctx, request.TabletType)
+	return response, s.tm.ChangeType(ctx, request.TabletType, request.GetSemiSync())
 }
 
 func (s *server) RefreshState(ctx context.Context, request *tabletmanagerdatapb.RefreshStateRequest) (response *tabletmanagerdatapb.RefreshStateResponse, err error) {
diff --git a/go/vt/vttablet/tabletmanager/rpc_actions.go b/go/vt/vttablet/tabletmanager/rpc_actions.go
index 6e83f4a93fb..2a19256f817 100644
--- a/go/vt/vttablet/tabletmanager/rpc_actions.go
+++ b/go/vt/vttablet/tabletmanager/rpc_actions.go
@@ -78,16 +78,16 @@ func (tm *TabletManager) SetReadOnly(ctx context.Context, rdonly bool) error {
 }
 
 // ChangeType changes the tablet type
-func (tm *TabletManager) ChangeType(ctx context.Context, tabletType topodatapb.TabletType) error {
+func (tm *TabletManager) ChangeType(ctx context.Context, tabletType topodatapb.TabletType, semiSync bool) error {
 	if err := tm.lock(ctx); err != nil {
 		return err
 	}
 	defer tm.unlock()
-	return tm.changeTypeLocked(ctx, tabletType, DBActionNone)
+	return tm.changeTypeLocked(ctx, tabletType, DBActionNone, convertBoolToSemiSyncAction(semiSync))
 }
 
 // ChangeType changes the tablet type
-func (tm *TabletManager) changeTypeLocked(ctx context.Context, tabletType topodatapb.TabletType, action DBAction) error {
+func (tm *TabletManager) changeTypeLocked(ctx context.Context, tabletType topodatapb.TabletType, action DBAction, semiSync SemiSyncAction) error {
 	// We don't want to allow multiple callers to claim a tablet as drained. There is a race that could happen during
 	// horizontal resharding where two vtworkers will try to DRAIN the same tablet. This check prevents that race from
 	// causing errors.
@@ -100,7 +100,7 @@ func (tm *TabletManager) changeTypeLocked(ctx context.Context, tabletType topoda
 	}
 
 	// Let's see if we need to fix semi-sync acking.
-	if err := tm.fixSemiSyncAndReplication(tm.Tablet().Type, SemiSyncActionFalse); err != nil {
+	if err := tm.fixSemiSyncAndReplication(tm.Tablet().Type, semiSync); err != nil {
 		return vterrors.Wrap(err, "fixSemiSyncAndReplication failed, may not ack correctly")
 	}
 	return nil
diff --git a/go/vt/vttablet/tabletmanager/rpc_agent.go b/go/vt/vttablet/tabletmanager/rpc_agent.go
index 7c144d0c00b..a035103971d 100644
--- a/go/vt/vttablet/tabletmanager/rpc_agent.go
+++ b/go/vt/vttablet/tabletmanager/rpc_agent.go
@@ -48,7 +48,7 @@ type RPCTM interface {
 
 	SetReadOnly(ctx context.Context, rdonly bool) error
 
-	ChangeType(ctx context.Context, tabletType topodatapb.TabletType) error
+	ChangeType(ctx context.Context, tabletType topodatapb.TabletType, semiSync bool) error
 
 	Sleep(ctx context.Context, duration time.Duration)
 
diff --git a/go/vt/vttablet/tabletmanager/rpc_backup.go b/go/vt/vttablet/tabletmanager/rpc_backup.go
index 9c9ff6e4b04..47474931ac6 100644
--- a/go/vt/vttablet/tabletmanager/rpc_backup.go
+++ b/go/vt/vttablet/tabletmanager/rpc_backup.go
@@ -85,7 +85,7 @@ func (tm *TabletManager) Backup(ctx context.Context, concurrency int, logger log
 		}
 		originalType = tablet.Type
 		// update our type to BACKUP
-		if err := tm.changeTypeLocked(ctx, topodatapb.TabletType_BACKUP, DBActionNone); err != nil {
+		if err := tm.changeTypeLocked(ctx, topodatapb.TabletType_BACKUP, DBActionNone, SemiSyncActionFalse); err != nil {
 			return err
 		}
 		// Tell Orchestrator we're stopped on purpose for some Vitess task.
@@ -126,7 +126,7 @@ func (tm *TabletManager) Backup(ctx context.Context, concurrency int, logger log
 
 		// Change our type back to the original value.
 		// Original type could be primary so pass in a real value for PrimaryTermStartTime
-		if err := tm.changeTypeLocked(bgCtx, originalType, DBActionNone); err != nil {
+		if err := tm.changeTypeLocked(bgCtx, originalType, DBActionNone, SemiSyncActionNone); err != nil {
 			// failure in changing the topology type is probably worse,
 			// so returning that (we logged the snapshot error anyway)
 			if returnErr != nil {
diff --git a/go/vt/vttablet/tabletmanager/rpc_replication.go b/go/vt/vttablet/tabletmanager/rpc_replication.go
index 985a6438549..384d653cccf 100644
--- a/go/vt/vttablet/tabletmanager/rpc_replication.go
+++ b/go/vt/vttablet/tabletmanager/rpc_replication.go
@@ -284,7 +284,7 @@ func (tm *TabletManager) InitPrimary(ctx context.Context, semiSync bool) (string
 	// Set the server read-write, from now on we can accept real
 	// client writes. Note that if semi-sync replication is enabled,
 	// we'll still need some replicas to be able to commit transactions.
-	if err := tm.changeTypeLocked(ctx, topodatapb.TabletType_PRIMARY, DBActionSetReadWrite); err != nil {
+	if err := tm.changeTypeLocked(ctx, topodatapb.TabletType_PRIMARY, DBActionSetReadWrite, convertBoolToSemiSyncAction(semiSync)); err != nil {
 		return "", err
 	}
 
@@ -331,7 +331,7 @@ func (tm *TabletManager) InitReplica(ctx context.Context, parent *topodatapb.Tab
 	// is used on the old primary when using InitShardPrimary with
 	// -force, and the new primary is different from the old primary.
 	if tm.Tablet().Type == topodatapb.TabletType_PRIMARY {
-		if err := tm.changeTypeLocked(ctx, topodatapb.TabletType_REPLICA, DBActionNone); err != nil {
+		if err := tm.changeTypeLocked(ctx, topodatapb.TabletType_REPLICA, DBActionNone, convertBoolToSemiSyncAction(semiSync)); err != nil {
 			return err
 		}
 	}
@@ -545,7 +545,11 @@ func (tm *TabletManager) UndoDemotePrimary(ctx context.Context, semiSync bool) e
 // ReplicaWasPromoted promotes a replica to primary, no questions asked.
 func (tm *TabletManager) ReplicaWasPromoted(ctx context.Context) error {
 	log.Infof("ReplicaWasPromoted")
-	return tm.ChangeType(ctx, topodatapb.TabletType_PRIMARY)
+	if err := tm.lock(ctx); err != nil {
+		return err
+	}
+	defer tm.unlock()
+	return tm.changeTypeLocked(ctx, topodatapb.TabletType_PRIMARY, DBActionNone, SemiSyncActionNone)
 }
 
 // SetReplicationSource sets replication primary, and waits for the
@@ -848,7 +852,7 @@ func (tm *TabletManager) PromoteReplica(ctx context.Context, semiSync bool) (str
 		return "", err
 	}
 
-	if err := tm.changeTypeLocked(ctx, topodatapb.TabletType_PRIMARY, DBActionSetReadWrite); err != nil {
+	if err := tm.changeTypeLocked(ctx, topodatapb.TabletType_PRIMARY, DBActionSetReadWrite, SemiSyncActionNone); err != nil {
 		return "", err
 	}
 
diff --git a/go/vt/vttablet/tabletmanager/shard_sync.go b/go/vt/vttablet/tabletmanager/shard_sync.go
index 81e01fd6eef..0b257537b4b 100644
--- a/go/vt/vttablet/tabletmanager/shard_sync.go
+++ b/go/vt/vttablet/tabletmanager/shard_sync.go
@@ -213,7 +213,7 @@ func (tm *TabletManager) endPrimaryTerm(ctx context.Context, primaryAlias *topod
 		log.Infof("Active reparents are disabled; updating tablet state only.")
 		changeTypeCtx, cancel := context.WithTimeout(ctx, *topo.RemoteOperationTimeout)
 		defer cancel()
-		if err := tm.ChangeType(changeTypeCtx, tm.baseTabletType); err != nil {
+		if err := tm.tmState.ChangeTabletType(changeTypeCtx, tm.baseTabletType, DBActionNone); err != nil {
 			return vterrors.Wrapf(err, "failed to change type to %v", tm.baseTabletType)
 		}
 		return nil
diff --git a/go/vt/vttablet/tmclient/rpc_client_api.go b/go/vt/vttablet/tmclient/rpc_client_api.go
index 3709df3e72e..fd09d582928 100644
--- a/go/vt/vttablet/tmclient/rpc_client_api.go
+++ b/go/vt/vttablet/tmclient/rpc_client_api.go
@@ -63,7 +63,7 @@ type TabletManagerClient interface {
 	SetReadWrite(ctx context.Context, tablet *topodatapb.Tablet) error
 
 	// ChangeType asks the remote tablet to change its type
-	ChangeType(ctx context.Context, tablet *topodatapb.Tablet, dbType topodatapb.TabletType) error
+	ChangeType(ctx context.Context, tablet *topodatapb.Tablet, dbType topodatapb.TabletType, semiSync bool) error
 
 	// Sleep will sleep for a duration (used for tests)
 	Sleep(ctx context.Context, tablet *topodatapb.Tablet, duration time.Duration) error
diff --git a/go/vt/vttablet/tmrpctest/test_tm_rpc.go b/go/vt/vttablet/tmrpctest/test_tm_rpc.go
index cb17bd14ec5..3c35c1c434b 100644
--- a/go/vt/vttablet/tmrpctest/test_tm_rpc.go
+++ b/go/vt/vttablet/tmrpctest/test_tm_rpc.go
@@ -373,7 +373,7 @@ func tmRPCTestSetReadOnlyPanic(ctx context.Context, t *testing.T, client tmclien
 
 var testChangeTypeValue = topodatapb.TabletType_REPLICA
 
-func (fra *fakeRPCTM) ChangeType(ctx context.Context, tabletType topodatapb.TabletType) error {
+func (fra *fakeRPCTM) ChangeType(ctx context.Context, tabletType topodatapb.TabletType, semiSync bool) error {
 	if fra.panics {
 		panic(fmt.Errorf("test-triggered panic"))
 	}
@@ -382,14 +382,14 @@ func (fra *fakeRPCTM) ChangeType(ctx context.Context, tabletType topodatapb.Tabl
 }
 
 func tmRPCTestChangeType(ctx context.Context, t *testing.T, client tmclient.TabletManagerClient, tablet *topodatapb.Tablet) {
-	err := client.ChangeType(ctx, tablet, testChangeTypeValue)
+	err := client.ChangeType(ctx, tablet, testChangeTypeValue, false)
 	if err != nil {
 		t.Errorf("ChangeType failed: %v", err)
 	}
 }
 
 func tmRPCTestChangeTypePanic(ctx context.Context, t *testing.T, client tmclient.TabletManagerClient, tablet *topodatapb.Tablet) {
-	err := client.ChangeType(ctx, tablet, testChangeTypeValue)
+	err := client.ChangeType(ctx, tablet, testChangeTypeValue, false)
 	expectHandleRPCPanic(t, "ChangeType", true /*verbose*/, err)
 }
 
diff --git a/go/vt/worker/split_clone_flaky_test.go b/go/vt/worker/split_clone_flaky_test.go
index 45a9f1b6259..2295c875e38 100644
--- a/go/vt/worker/split_clone_flaky_test.go
+++ b/go/vt/worker/split_clone_flaky_test.go
@@ -1058,7 +1058,7 @@ func TestSplitCloneV2_NoPrimaryAvailable(t *testing.T) {
 		}
 
 		// Make leftReplica the new PRIMARY.
-		tc.leftReplica.TM.ChangeType(ctx, topodatapb.TabletType_PRIMARY)
+		tc.leftReplica.TM.ChangeType(ctx, topodatapb.TabletType_PRIMARY, false)
 		t.Logf("resetting tablet back to PRIMARY")
 		tc.leftReplicaQs.UpdateType(topodatapb.TabletType_PRIMARY)
 		tc.leftReplicaQs.AddDefaultHealthResponse()
diff --git a/go/vt/worker/utils_test.go b/go/vt/worker/utils_test.go
index 2c7a9d3bee2..966e27199ad 100644
--- a/go/vt/worker/utils_test.go
+++ b/go/vt/worker/utils_test.go
@@ -102,7 +102,7 @@ func newFakeTMCTopo(ts *topo.Server) tmclient.TabletManagerClient {
 }
 
 // ChangeType is part of the tmclient.TabletManagerClient interface.
-func (f *fakeTMCTopo) ChangeType(ctx context.Context, tablet *topodatapb.Tablet, dbType topodatapb.TabletType) error {
+func (f *fakeTMCTopo) ChangeType(ctx context.Context, tablet *topodatapb.Tablet, dbType topodatapb.TabletType, semiSync bool) error {
 	_, err := f.server.UpdateTabletFields(ctx, tablet.Alias, func(t *topodatapb.Tablet) error {
 		t.Type = dbType
 		return nil
diff --git a/go/vt/wrangler/cleaner.go b/go/vt/wrangler/cleaner.go
index 10621b049e6..bf3a14be32e 100644
--- a/go/vt/wrangler/cleaner.go
+++ b/go/vt/wrangler/cleaner.go
@@ -135,7 +135,7 @@ func RecordChangeTabletTypeAction(cleaner *Cleaner, tabletAlias *topodatapb.Tabl
 		}
 
 		// ask the tablet to make the change
-		return wr.tmc.ChangeType(ctx, ti.Tablet, to)
+		return wr.ChangeTabletType(ctx, ti.Tablet.Alias, to)
 	})
 }
 
diff --git a/go/vt/wrangler/reparent.go b/go/vt/wrangler/reparent.go
index 96fa246f93f..b9fa4384488 100644
--- a/go/vt/wrangler/reparent.go
+++ b/go/vt/wrangler/reparent.go
@@ -200,7 +200,7 @@ func (wr *Wrangler) TabletExternallyReparented(ctx context.Context, newPrimaryAl
 		}()
 		event.DispatchUpdate(ev, "starting external reparent")
 
-		if err := wr.tmc.ChangeType(ctx, tablet, topodatapb.TabletType_PRIMARY); err != nil {
+		if err := wr.tmc.ChangeType(ctx, tablet, topodatapb.TabletType_PRIMARY, reparentutil.SemiSyncAckers(tablet) > 0); err != nil {
 			log.Warningf("Error calling ChangeType on new primary %v: %v", topoproto.TabletAliasString(newPrimaryAlias), err)
 			return err
 		}
diff --git a/go/vt/wrangler/tablet.go b/go/vt/wrangler/tablet.go
index 06e41b8c306..c3d2291b68c 100644
--- a/go/vt/wrangler/tablet.go
+++ b/go/vt/wrangler/tablet.go
@@ -26,9 +26,12 @@ import (
 
 	"vitess.io/vitess/go/vt/key"
 	"vitess.io/vitess/go/vt/logutil"
+	"vitess.io/vitess/go/vt/proto/vtrpc"
 	"vitess.io/vitess/go/vt/topo"
 	"vitess.io/vitess/go/vt/topo/topoproto"
 	"vitess.io/vitess/go/vt/topotools"
+	"vitess.io/vitess/go/vt/vtctl/reparentutil"
+	"vitess.io/vitess/go/vt/vterrors"
 
 	querypb "vitess.io/vitess/go/vt/proto/query"
 	topodatapb "vitess.io/vitess/go/vt/proto/topodata"
@@ -171,8 +174,38 @@ func (wr *Wrangler) ChangeTabletType(ctx context.Context, tabletAlias *topodatap
 		return fmt.Errorf("tablet %v type change %v -> %v is not an allowed transition for ChangeTabletType", tabletAlias, ti.Type, tabletType)
 	}
 
+	semiSync, err := wr.shouldSendSemiSyncAck(ctx, ti.Tablet)
+	if err != nil {
+		return err
+	}
 	// and ask the tablet to make the change
-	return wr.tmc.ChangeType(ctx, ti.Tablet, tabletType)
+	return wr.tmc.ChangeType(ctx, ti.Tablet, tabletType, semiSync)
+}
+
+func (wr *Wrangler) shouldSendSemiSyncAck(ctx context.Context, tablet *topodatapb.Tablet) (bool, error) {
+	shard, err := wr.ts.GetShard(ctx, tablet.Keyspace, tablet.Shard)
+	if err != nil {
+		return false, err
+	}
+
+	if !shard.HasPrimary() {
+		return false, vterrors.Errorf(vtrpc.Code_FAILED_PRECONDITION, "no primary tablet for shard %v/%v", tablet.Keyspace, tablet.Shard)
+	}
+
+	shardPrimary, err := wr.ts.GetTablet(ctx, shard.PrimaryAlias)
+	if err != nil {
+		return false, fmt.Errorf("cannot lookup primary tablet %v for shard %v/%v: %w", topoproto.TabletAliasString(shard.PrimaryAlias), tablet.Keyspace, tablet.Shard, err)
+	}
+
+	if shardPrimary.Type != topodatapb.TabletType_PRIMARY {
+		return false, vterrors.Errorf(vtrpc.Code_FAILED_PRECONDITION, "TopologyServer has incosistent state for shard primary %v", topoproto.TabletAliasString(shard.PrimaryAlias))
+	}
+
+	if shardPrimary.Keyspace != tablet.Keyspace || shardPrimary.Shard != tablet.Shard {
+		return false, vterrors.Errorf(vtrpc.Code_FAILED_PRECONDITION, "primary %v and potential replica %v not in same keypace shard (%v/%v)", topoproto.TabletAliasString(shard.PrimaryAlias), topoproto.TabletAliasString(tablet.Alias), tablet.Keyspace, tablet.Shard)
+	}
+
+	return reparentutil.ReplicaSemiSync(shardPrimary.Tablet, tablet), nil
 }
 
 // RefreshTabletState refreshes tablet state
diff --git a/proto/tabletmanagerdata.proto b/proto/tabletmanagerdata.proto
index fd3e6f8a823..c2169a66889 100644
--- a/proto/tabletmanagerdata.proto
+++ b/proto/tabletmanagerdata.proto
@@ -161,6 +161,7 @@ message SetReadWriteResponse {
 
 message ChangeTypeRequest {
   topodata.TabletType tablet_type = 1;
+  bool semiSync = 2;
 }
 
 message ChangeTypeResponse {
diff --git a/web/vtadmin/src/proto/vtadmin.d.ts b/web/vtadmin/src/proto/vtadmin.d.ts
index be70591b802..1f10c08a9ce 100644
--- a/web/vtadmin/src/proto/vtadmin.d.ts
+++ b/web/vtadmin/src/proto/vtadmin.d.ts
@@ -12277,6 +12277,9 @@ export namespace tabletmanagerdata {
 
         /** ChangeTypeRequest tablet_type */
         tablet_type?: (topodata.TabletType|null);
+
+        /** ChangeTypeRequest semiSync */
+        semiSync?: (boolean|null);
     }
 
     /** Represents a ChangeTypeRequest. */
@@ -12291,6 +12294,9 @@ export namespace tabletmanagerdata {
         /** ChangeTypeRequest tablet_type. */
         public tablet_type: topodata.TabletType;
 
+        /** ChangeTypeRequest semiSync. */
+        public semiSync: boolean;
+
         /**
          * Creates a new ChangeTypeRequest instance using the specified properties.
          * @param [properties] Properties to set
diff --git a/web/vtadmin/src/proto/vtadmin.js b/web/vtadmin/src/proto/vtadmin.js
index 29490de581a..dab9d2e4f06 100644
--- a/web/vtadmin/src/proto/vtadmin.js
+++ b/web/vtadmin/src/proto/vtadmin.js
@@ -28631,6 +28631,7 @@ $root.tabletmanagerdata = (function() {
          * @memberof tabletmanagerdata
          * @interface IChangeTypeRequest
          * @property {topodata.TabletType|null} [tablet_type] ChangeTypeRequest tablet_type
+         * @property {boolean|null} [semiSync] ChangeTypeRequest semiSync
          */
 
         /**
@@ -28656,6 +28657,14 @@ $root.tabletmanagerdata = (function() {
          */
         ChangeTypeRequest.prototype.tablet_type = 0;
 
+        /**
+         * ChangeTypeRequest semiSync.
+         * @member {boolean} semiSync
+         * @memberof tabletmanagerdata.ChangeTypeRequest
+         * @instance
+         */
+        ChangeTypeRequest.prototype.semiSync = false;
+
         /**
          * Creates a new ChangeTypeRequest instance using the specified properties.
          * @function create
@@ -28682,6 +28691,8 @@ $root.tabletmanagerdata = (function() {
                 writer = $Writer.create();
             if (message.tablet_type != null && Object.hasOwnProperty.call(message, "tablet_type"))
                 writer.uint32(/* id 1, wireType 0 =*/8).int32(message.tablet_type);
+            if (message.semiSync != null && Object.hasOwnProperty.call(message, "semiSync"))
+                writer.uint32(/* id 2, wireType 0 =*/16).bool(message.semiSync);
             return writer;
         };
 
@@ -28719,6 +28730,9 @@ $root.tabletmanagerdata = (function() {
                 case 1:
                     message.tablet_type = reader.int32();
                     break;
+                case 2:
+                    message.semiSync = reader.bool();
+                    break;
                 default:
                     reader.skipType(tag & 7);
                     break;
@@ -28771,6 +28785,9 @@ $root.tabletmanagerdata = (function() {
                 case 8:
                     break;
                 }
+            if (message.semiSync != null && message.hasOwnProperty("semiSync"))
+                if (typeof message.semiSync !== "boolean")
+                    return "semiSync: boolean expected";
             return null;
         };
 
@@ -28832,6 +28849,8 @@ $root.tabletmanagerdata = (function() {
                 message.tablet_type = 8;
                 break;
             }
+            if (object.semiSync != null)
+                message.semiSync = Boolean(object.semiSync);
             return message;
         };
 
@@ -28848,10 +28867,14 @@ $root.tabletmanagerdata = (function() {
             if (!options)
                 options = {};
             var object = {};
-            if (options.defaults)
+            if (options.defaults) {
                 object.tablet_type = options.enums === String ? "UNKNOWN" : 0;
+                object.semiSync = false;
+            }
             if (message.tablet_type != null && message.hasOwnProperty("tablet_type"))
                 object.tablet_type = options.enums === String ? $root.topodata.TabletType[message.tablet_type] : message.tablet_type;
+            if (message.semiSync != null && message.hasOwnProperty("semiSync"))
+                object.semiSync = message.semiSync;
             return object;
         };
 

From 82e5a471989fbb060bf179aa882bca3433932dc5 Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Sat, 22 Jan 2022 15:25:29 +0530
Subject: [PATCH 15/30] feat: add durability flag to vtworker

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 go/cmd/vtworker/vtworker.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/go/cmd/vtworker/vtworker.go b/go/cmd/vtworker/vtworker.go
index 7c9a1fa40e8..6f8a30bc73c 100644
--- a/go/cmd/vtworker/vtworker.go
+++ b/go/cmd/vtworker/vtworker.go
@@ -37,6 +37,7 @@ import (
 	"vitess.io/vitess/go/vt/logutil"
 	"vitess.io/vitess/go/vt/servenv"
 	"vitess.io/vitess/go/vt/topo"
+	"vitess.io/vitess/go/vt/vtctl/reparentutil"
 	"vitess.io/vitess/go/vt/worker"
 )
 
@@ -44,6 +45,7 @@ var (
 	cell                   = flag.String("cell", "", "cell to pick servers from")
 	commandDisplayInterval = flag.Duration("command_display_interval", time.Second, "Interval between each status update when vtworker is executing a single command from the command line")
 	username               = flag.String("username", "", "If set, value is set as immediate caller id in the request and used by vttablet for TableACL check")
+	durability             = flag.String("durability", "none", "type of durability to enforce. Default is none. Other values are dictated by registered plugins")
 )
 
 func init() {
@@ -78,6 +80,11 @@ func main() {
 		os.Exit(0)
 	}
 
+	if err := reparentutil.SetDurabilityPolicy(*durability, nil); err != nil {
+		log.Errorf("error in setting durability policy: %v", err)
+		exit.Return(1)
+	}
+
 	ts := topo.Open()
 	defer ts.Close()
 

From 8ac91e185c8ec22b5b43351c1b1c6b8a0ed8f2ca Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Sat, 22 Jan 2022 16:24:21 +0530
Subject: [PATCH 16/30] feat: fix StartReplication to allow passing semiSync as
 a parameter

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 go/test/endtoend/tabletmanager/main_test.go   |   2 +-
 go/test/fuzzing/vttablet_fuzzer.go            |   2 +-
 .../tabletmanagerdata/tabletmanagerdata.pb.go | 347 +++++++++---------
 .../tabletmanagerdata_vtproto.pb.go           |  33 ++
 go/vt/vtcombo/tablet_map.go                   |   2 +-
 go/vt/vtctl/grpcvtctldserver/server.go        |  24 +-
 .../testutil/test_tmclient.go                 |   2 +-
 go/vt/vttablet/faketmclient/fake_client.go    |   2 +-
 go/vt/vttablet/grpctmclient/client.go         |   6 +-
 go/vt/vttablet/grpctmserver/server.go         |   2 +-
 go/vt/vttablet/tabletmanager/rpc_agent.go     |   2 +-
 .../vttablet/tabletmanager/rpc_replication.go |   4 +-
 go/vt/vttablet/tmclient/rpc_client_api.go     |   2 +-
 go/vt/vttablet/tmrpctest/test_tm_rpc.go       |   6 +-
 go/vt/worker/multi_split_diff.go              |   2 +-
 go/vt/wrangler/cleaner.go                     |   2 +-
 go/vt/wrangler/tablet.go                      |  10 +
 proto/tabletmanagerdata.proto                 |   1 +
 web/vtadmin/src/proto/vtadmin.d.ts            |   6 +
 web/vtadmin/src/proto/vtadmin.js              |  33 +-
 20 files changed, 301 insertions(+), 189 deletions(-)

diff --git a/go/test/endtoend/tabletmanager/main_test.go b/go/test/endtoend/tabletmanager/main_test.go
index 9c118465edc..3bf20a01c50 100644
--- a/go/test/endtoend/tabletmanager/main_test.go
+++ b/go/test/endtoend/tabletmanager/main_test.go
@@ -182,7 +182,7 @@ func tmcStopReplication(ctx context.Context, tabletGrpcPort int) error {
 
 func tmcStartReplication(ctx context.Context, tabletGrpcPort int) error {
 	vtablet := getTablet(tabletGrpcPort)
-	return tmClient.StartReplication(ctx, vtablet)
+	return tmClient.StartReplication(ctx, vtablet, false)
 }
 
 func tmcPrimaryPosition(ctx context.Context, tabletGrpcPort int) (string, error) {
diff --git a/go/test/fuzzing/vttablet_fuzzer.go b/go/test/fuzzing/vttablet_fuzzer.go
index 31231b1549c..bd94bc0084d 100644
--- a/go/test/fuzzing/vttablet_fuzzer.go
+++ b/go/test/fuzzing/vttablet_fuzzer.go
@@ -331,7 +331,7 @@ func (fs *fuzzStore) callStartReplication() error {
 	if err != nil {
 		return err
 	}
-	_ = fs.client.StartReplication(context.Background(), tablet)
+	_ = fs.client.StartReplication(context.Background(), tablet, false)
 	return nil
 }
 
diff --git a/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go b/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go
index 257e3b3c6b6..ab5e353d3bc 100644
--- a/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go
+++ b/go/vt/proto/tabletmanagerdata/tabletmanagerdata.pb.go
@@ -2918,6 +2918,8 @@ type StartReplicationRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
+
+	SemiSync bool `protobuf:"varint,1,opt,name=semiSync,proto3" json:"semiSync,omitempty"`
 }
 
 func (x *StartReplicationRequest) Reset() {
@@ -2952,6 +2954,13 @@ func (*StartReplicationRequest) Descriptor() ([]byte, []int) {
 	return file_tabletmanagerdata_proto_rawDescGZIP(), []int{58}
 }
 
+func (x *StartReplicationRequest) GetSemiSync() bool {
+	if x != nil {
+		return x.SemiSync
+	}
+	return false
+}
+
 type StartReplicationResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -5011,177 +5020,179 @@ var file_tabletmanagerdata_proto_rawDesc = []byte{
 	0x3c, 0x0a, 0x1e, 0x53, 0x74, 0x6f, 0x70, 0x52, 0x65, 0x70, 0x6c, 0x69, 0x63, 0x61, 0x74, 0x69,
 	0x6f, 0x6e, 0x4d, 0x69, 0x6e, 0x69, 0x6d, 0x75, 0x6d, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73,
 	0x65, 0x12, 0x1a, 0x0a, 0x08, 0x70, 0x6f, 0x73, 0x69, 0x74, 0x69, 0x6f, 0x6e, 0x18, 0x01, 0x20,
-	0x01, 0x28, 0x09, 0x52, 0x08, 0x70, 0x6f, 0x73, 0x69, 0x74, 0x69, 0x6f, 0x6e, 0x22, 0x19, 0x0a,
+	0x01, 0x28, 0x09, 0x52, 0x08, 0x70, 0x6f, 0x73, 0x69, 0x74, 0x69, 0x6f, 0x6e, 0x22, 0x35, 0x0a,
 	0x17, 0x53, 0x74, 0x61, 0x72, 0x74, 0x52, 0x65, 0x70, 0x6c, 0x69, 0x63, 0x61, 0x74, 0x69, 0x6f,
-	0x6e, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x22, 0x1a, 0x0a, 0x18, 0x53, 0x74, 0x61, 0x72,
-	0x74, 0x52, 0x65, 0x70, 0x6c, 0x69, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x52, 0x65, 0x73, 0x70,
-	0x6f, 0x6e, 0x73, 0x65, 0x22, 0x62, 0x0a, 0x21, 0x53, 0x74, 0x61, 0x72, 0x74, 0x52, 0x65, 0x70,
+	0x6e, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x1a, 0x0a, 0x08, 0x73, 0x65, 0x6d, 0x69,
+	0x53, 0x79, 0x6e, 0x63, 0x18, 0x01, 0x20, 0x01, 0x28, 0x08, 0x52, 0x08, 0x73, 0x65, 0x6d, 0x69,
+	0x53, 0x79, 0x6e, 0x63, 0x22, 0x1a, 0x0a, 0x18, 0x53, 0x74, 0x61, 0x72, 0x74, 0x52, 0x65, 0x70,
+	0x6c, 0x69, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65,
+	0x22, 0x62, 0x0a, 0x21, 0x53, 0x74, 0x61, 0x72, 0x74, 0x52, 0x65, 0x70, 0x6c, 0x69, 0x63, 0x61,
+	0x74, 0x69, 0x6f, 0x6e, 0x55, 0x6e, 0x74, 0x69, 0x6c, 0x41, 0x66, 0x74, 0x65, 0x72, 0x52, 0x65,
+	0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x1a, 0x0a, 0x08, 0x70, 0x6f, 0x73, 0x69, 0x74, 0x69, 0x6f,
+	0x6e, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x08, 0x70, 0x6f, 0x73, 0x69, 0x74, 0x69, 0x6f,
+	0x6e, 0x12, 0x21, 0x0a, 0x0c, 0x77, 0x61, 0x69, 0x74, 0x5f, 0x74, 0x69, 0x6d, 0x65, 0x6f, 0x75,
+	0x74, 0x18, 0x02, 0x20, 0x01, 0x28, 0x03, 0x52, 0x0b, 0x77, 0x61, 0x69, 0x74, 0x54, 0x69, 0x6d,
+	0x65, 0x6f, 0x75, 0x74, 0x22, 0x24, 0x0a, 0x22, 0x53, 0x74, 0x61, 0x72, 0x74, 0x52, 0x65, 0x70,
 	0x6c, 0x69, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x55, 0x6e, 0x74, 0x69, 0x6c, 0x41, 0x66, 0x74,
-	0x65, 0x72, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x1a, 0x0a, 0x08, 0x70, 0x6f, 0x73,
-	0x69, 0x74, 0x69, 0x6f, 0x6e, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x08, 0x70, 0x6f, 0x73,
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+	0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go b/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go
index 408228be1a3..05c967f754a 100644
--- a/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go
+++ b/go/vt/proto/tabletmanagerdata/tabletmanagerdata_vtproto.pb.go
@@ -2613,6 +2613,16 @@ func (m *StartReplicationRequest) MarshalToSizedBufferVT(dAtA []byte) (int, erro
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
+	if m.SemiSync {
+		i--
+		if m.SemiSync {
+			dAtA[i] = 1
+		} else {
+			dAtA[i] = 0
+		}
+		i--
+		dAtA[i] = 0x8
+	}
 	return len(dAtA) - i, nil
 }
 
@@ -5195,6 +5205,9 @@ func (m *StartReplicationRequest) SizeVT() (n int) {
 	}
 	var l int
 	_ = l
+	if m.SemiSync {
+		n += 2
+	}
 	if m.unknownFields != nil {
 		n += len(m.unknownFields)
 	}
@@ -11350,6 +11363,26 @@ func (m *StartReplicationRequest) UnmarshalVT(dAtA []byte) error {
 			return fmt.Errorf("proto: StartReplicationRequest: illegal tag %d (wire type %d)", fieldNum, wire)
 		}
 		switch fieldNum {
+		case 1:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field SemiSync", wireType)
+			}
+			var v int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				v |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			m.SemiSync = bool(v != 0)
 		default:
 			iNdEx = preIndex
 			skippy, err := skip(dAtA[iNdEx:])
diff --git a/go/vt/vtcombo/tablet_map.go b/go/vt/vtcombo/tablet_map.go
index 754d15d2af2..523f3b0beb9 100644
--- a/go/vt/vtcombo/tablet_map.go
+++ b/go/vt/vtcombo/tablet_map.go
@@ -997,7 +997,7 @@ func (itmc *internalTabletManagerClient) StopReplicationMinimum(context.Context,
 	return "", fmt.Errorf("not implemented in vtcombo")
 }
 
-func (itmc *internalTabletManagerClient) StartReplication(context.Context, *topodatapb.Tablet) error {
+func (itmc *internalTabletManagerClient) StartReplication(context.Context, *topodatapb.Tablet, bool) error {
 	return fmt.Errorf("not implemented in vtcombo")
 }
 
diff --git a/go/vt/vtctl/grpcvtctldserver/server.go b/go/vt/vtctl/grpcvtctldserver/server.go
index 7b5469d0acf..fcd3481e845 100644
--- a/go/vt/vtctl/grpcvtctldserver/server.go
+++ b/go/vt/vtctl/grpcvtctldserver/server.go
@@ -2362,7 +2362,29 @@ func (s *VtctldServer) StartReplication(ctx context.Context, req *vtctldatapb.St
 		return nil, err
 	}
 
-	if err := s.tmc.StartReplication(ctx, tablet.Tablet); err != nil {
+	shard, err := s.ts.GetShard(ctx, tablet.Keyspace, tablet.Shard)
+	if err != nil {
+		return nil, err
+	}
+
+	if !shard.HasPrimary() {
+		return nil, vterrors.Errorf(vtrpc.Code_FAILED_PRECONDITION, "no primary tablet for shard %v/%v", tablet.Keyspace, tablet.Shard)
+	}
+
+	shardPrimary, err := s.ts.GetTablet(ctx, shard.PrimaryAlias)
+	if err != nil {
+		return nil, fmt.Errorf("cannot lookup primary tablet %v for shard %v/%v: %w", topoproto.TabletAliasString(shard.PrimaryAlias), tablet.Keyspace, tablet.Shard, err)
+	}
+
+	if shardPrimary.Type != topodatapb.TabletType_PRIMARY {
+		return nil, vterrors.Errorf(vtrpc.Code_FAILED_PRECONDITION, "TopologyServer has incosistent state for shard primary %v", topoproto.TabletAliasString(shard.PrimaryAlias))
+	}
+
+	if shardPrimary.Keyspace != tablet.Keyspace || shardPrimary.Shard != tablet.Shard {
+		return nil, vterrors.Errorf(vtrpc.Code_FAILED_PRECONDITION, "primary %v and replica %v not in same keypace shard (%v/%v)", topoproto.TabletAliasString(shard.PrimaryAlias), topoproto.TabletAliasString(tablet.Alias), tablet.Keyspace, tablet.Shard)
+	}
+
+	if err := s.tmc.StartReplication(ctx, tablet.Tablet, reparentutil.ReplicaSemiSync(shardPrimary.Tablet, tablet.Tablet)); err != nil {
 		log.Errorf("StartReplication: failed to start replication on %v: %v", alias, err)
 		return nil, err
 	}
diff --git a/go/vt/vtctl/grpcvtctldserver/testutil/test_tmclient.go b/go/vt/vtctl/grpcvtctldserver/testutil/test_tmclient.go
index 57186e2de99..a3e676e8ded 100644
--- a/go/vt/vtctl/grpcvtctldserver/testutil/test_tmclient.go
+++ b/go/vt/vtctl/grpcvtctldserver/testutil/test_tmclient.go
@@ -744,7 +744,7 @@ func (fake *TabletManagerClient) Sleep(ctx context.Context, tablet *topodatapb.T
 }
 
 // StartReplication is part of the tmclient.TabletManagerClient interface.
-func (fake *TabletManagerClient) StartReplication(ctx context.Context, tablet *topodatapb.Tablet) error {
+func (fake *TabletManagerClient) StartReplication(ctx context.Context, tablet *topodatapb.Tablet, semiSync bool) error {
 	if fake.StartReplicationResults == nil {
 		return assert.AnError
 	}
diff --git a/go/vt/vttablet/faketmclient/fake_client.go b/go/vt/vttablet/faketmclient/fake_client.go
index 053e4f1bb45..3080c3122c0 100644
--- a/go/vt/vttablet/faketmclient/fake_client.go
+++ b/go/vt/vttablet/faketmclient/fake_client.go
@@ -202,7 +202,7 @@ func (client *FakeTabletManagerClient) PrimaryStatus(ctx context.Context, tablet
 }
 
 // StartReplication is part of the tmclient.TabletManagerClient interface.
-func (client *FakeTabletManagerClient) StartReplication(ctx context.Context, tablet *topodatapb.Tablet) error {
+func (client *FakeTabletManagerClient) StartReplication(ctx context.Context, tablet *topodatapb.Tablet, semiSync bool) error {
 	return nil
 }
 
diff --git a/go/vt/vttablet/grpctmclient/client.go b/go/vt/vttablet/grpctmclient/client.go
index b4b4ca329a5..39e2dd4827a 100644
--- a/go/vt/vttablet/grpctmclient/client.go
+++ b/go/vt/vttablet/grpctmclient/client.go
@@ -638,13 +638,15 @@ func (client *Client) StopReplicationMinimum(ctx context.Context, tablet *topoda
 }
 
 // StartReplication is part of the tmclient.TabletManagerClient interface.
-func (client *Client) StartReplication(ctx context.Context, tablet *topodatapb.Tablet) error {
+func (client *Client) StartReplication(ctx context.Context, tablet *topodatapb.Tablet, semiSync bool) error {
 	c, closer, err := client.dialer.dial(ctx, tablet)
 	if err != nil {
 		return err
 	}
 	defer closer.Close()
-	_, err = c.StartReplication(ctx, &tabletmanagerdatapb.StartReplicationRequest{})
+	_, err = c.StartReplication(ctx, &tabletmanagerdatapb.StartReplicationRequest{
+		SemiSync: semiSync,
+	})
 	return err
 }
 
diff --git a/go/vt/vttablet/grpctmserver/server.go b/go/vt/vttablet/grpctmserver/server.go
index 9c5fd232323..aebac897a15 100644
--- a/go/vt/vttablet/grpctmserver/server.go
+++ b/go/vt/vttablet/grpctmserver/server.go
@@ -333,7 +333,7 @@ func (s *server) StartReplication(ctx context.Context, request *tabletmanagerdat
 	defer s.tm.HandleRPCPanic(ctx, "StartReplication", request, response, true /*verbose*/, &err)
 	ctx = callinfo.GRPCCallInfo(ctx)
 	response = &tabletmanagerdatapb.StartReplicationResponse{}
-	return response, s.tm.StartReplication(ctx)
+	return response, s.tm.StartReplication(ctx, request.GetSemiSync())
 }
 
 func (s *server) StartReplicationUntilAfter(ctx context.Context, request *tabletmanagerdatapb.StartReplicationUntilAfterRequest) (response *tabletmanagerdatapb.StartReplicationUntilAfterResponse, err error) {
diff --git a/go/vt/vttablet/tabletmanager/rpc_agent.go b/go/vt/vttablet/tabletmanager/rpc_agent.go
index a035103971d..bd6fa0c301e 100644
--- a/go/vt/vttablet/tabletmanager/rpc_agent.go
+++ b/go/vt/vttablet/tabletmanager/rpc_agent.go
@@ -90,7 +90,7 @@ type RPCTM interface {
 
 	StopReplicationMinimum(ctx context.Context, position string, waitTime time.Duration) (string, error)
 
-	StartReplication(ctx context.Context) error
+	StartReplication(ctx context.Context, semiSync bool) error
 
 	StartReplicationUntilAfter(ctx context.Context, position string, waitTime time.Duration) error
 
diff --git a/go/vt/vttablet/tabletmanager/rpc_replication.go b/go/vt/vttablet/tabletmanager/rpc_replication.go
index 384d653cccf..467113d2828 100644
--- a/go/vt/vttablet/tabletmanager/rpc_replication.go
+++ b/go/vt/vttablet/tabletmanager/rpc_replication.go
@@ -173,7 +173,7 @@ func (tm *TabletManager) StopReplicationMinimum(ctx context.Context, position st
 
 // StartReplication will start the mysql. Works both when Vitess manages
 // replication or not (using hook if not).
-func (tm *TabletManager) StartReplication(ctx context.Context) error {
+func (tm *TabletManager) StartReplication(ctx context.Context, semiSync bool) error {
 	log.Infof("StartReplication")
 	if err := tm.lock(ctx); err != nil {
 		return err
@@ -193,7 +193,7 @@ func (tm *TabletManager) StartReplication(ctx context.Context) error {
 		}
 	}()
 
-	if err := tm.fixSemiSync(tm.Tablet().Type, SemiSyncActionFalse); err != nil {
+	if err := tm.fixSemiSync(tm.Tablet().Type, convertBoolToSemiSyncAction(semiSync)); err != nil {
 		return err
 	}
 	return tm.MysqlDaemon.StartReplication(tm.hookExtraEnv())
diff --git a/go/vt/vttablet/tmclient/rpc_client_api.go b/go/vt/vttablet/tmclient/rpc_client_api.go
index fd09d582928..eb1355419ec 100644
--- a/go/vt/vttablet/tmclient/rpc_client_api.go
+++ b/go/vt/vttablet/tmclient/rpc_client_api.go
@@ -129,7 +129,7 @@ type TabletManagerClient interface {
 	StopReplicationMinimum(ctx context.Context, tablet *topodatapb.Tablet, stopPos string, waitTime time.Duration) (string, error)
 
 	// StartReplication starts the mysql replication
-	StartReplication(ctx context.Context, tablet *topodatapb.Tablet) error
+	StartReplication(ctx context.Context, tablet *topodatapb.Tablet, semiSync bool) error
 
 	// StartReplicationUntilAfter starts replication until after the position specified
 	StartReplicationUntilAfter(ctx context.Context, tablet *topodatapb.Tablet, position string, duration time.Duration) error
diff --git a/go/vt/vttablet/tmrpctest/test_tm_rpc.go b/go/vt/vttablet/tmrpctest/test_tm_rpc.go
index 3c35c1c434b..4ac34b9b19d 100644
--- a/go/vt/vttablet/tmrpctest/test_tm_rpc.go
+++ b/go/vt/vttablet/tmrpctest/test_tm_rpc.go
@@ -822,7 +822,7 @@ func tmRPCTestStopReplicationMinimumPanic(ctx context.Context, t *testing.T, cli
 
 var testStartReplicationCalled = false
 
-func (fra *fakeRPCTM) StartReplication(ctx context.Context) error {
+func (fra *fakeRPCTM) StartReplication(ctx context.Context, semiSync bool) error {
 	if fra.panics {
 		panic(fmt.Errorf("test-triggered panic"))
 	}
@@ -831,12 +831,12 @@ func (fra *fakeRPCTM) StartReplication(ctx context.Context) error {
 }
 
 func tmRPCTestStartReplication(ctx context.Context, t *testing.T, client tmclient.TabletManagerClient, tablet *topodatapb.Tablet) {
-	err := client.StartReplication(ctx, tablet)
+	err := client.StartReplication(ctx, tablet, false)
 	compareError(t, "StartReplication", err, true, testStartReplicationCalled)
 }
 
 func tmRPCTestStartReplicationPanic(ctx context.Context, t *testing.T, client tmclient.TabletManagerClient, tablet *topodatapb.Tablet) {
-	err := client.StartReplication(ctx, tablet)
+	err := client.StartReplication(ctx, tablet, false)
 	expectHandleRPCPanic(t, "StartReplication", true /*verbose*/, err)
 }
 
diff --git a/go/vt/worker/multi_split_diff.go b/go/vt/worker/multi_split_diff.go
index d2cabbb5cb4..0f5d1cf6123 100644
--- a/go/vt/worker/multi_split_diff.go
+++ b/go/vt/worker/multi_split_diff.go
@@ -407,7 +407,7 @@ func (msdw *MultiSplitDiffWorker) stopReplicationOnSourceTabletAt(ctx context.Co
 		msdw.wr.Logger().Infof("stopping Replication %v at a minimum of %v", msdw.sourceAlias, vreplicationPos)
 
 		shortCtx, cancel = context.WithTimeout(ctx, *remoteActionsTimeout)
-		msdw.wr.TabletManagerClient().StartReplication(shortCtx, sourceTablet.Tablet)
+		msdw.wr.StartReplication(shortCtx, sourceTablet.Tablet)
 		cancel()
 		if err != nil {
 			return "", err
diff --git a/go/vt/wrangler/cleaner.go b/go/vt/wrangler/cleaner.go
index bf3a14be32e..57940a963a1 100644
--- a/go/vt/wrangler/cleaner.go
+++ b/go/vt/wrangler/cleaner.go
@@ -143,7 +143,7 @@ func RecordChangeTabletTypeAction(cleaner *Cleaner, tabletAlias *topodatapb.Tabl
 // into the specified Cleaner
 func RecordStartReplicationAction(cleaner *Cleaner, tablet *topodatapb.Tablet) {
 	cleaner.Record(StartReplicationActionName, topoproto.TabletAliasString(tablet.Alias), func(ctx context.Context, wr *Wrangler) error {
-		return wr.TabletManagerClient().StartReplication(ctx, tablet)
+		return wr.StartReplication(ctx, tablet)
 	})
 }
 
diff --git a/go/vt/wrangler/tablet.go b/go/vt/wrangler/tablet.go
index c3d2291b68c..36453baef59 100644
--- a/go/vt/wrangler/tablet.go
+++ b/go/vt/wrangler/tablet.go
@@ -182,6 +182,16 @@ func (wr *Wrangler) ChangeTabletType(ctx context.Context, tabletAlias *topodatap
 	return wr.tmc.ChangeType(ctx, ti.Tablet, tabletType, semiSync)
 }
 
+// StartReplication is used to start replication on the specified tablet
+// It also finds out if the tablet should be sending semi-sync ACKs or not.
+func (wr *Wrangler) StartReplication(ctx context.Context, tablet *topodatapb.Tablet) error {
+	semiSync, err := wr.shouldSendSemiSyncAck(ctx, tablet)
+	if err != nil {
+		return err
+	}
+	return wr.TabletManagerClient().StartReplication(ctx, tablet, semiSync)
+}
+
 func (wr *Wrangler) shouldSendSemiSyncAck(ctx context.Context, tablet *topodatapb.Tablet) (bool, error) {
 	shard, err := wr.ts.GetShard(ctx, tablet.Keyspace, tablet.Shard)
 	if err != nil {
diff --git a/proto/tabletmanagerdata.proto b/proto/tabletmanagerdata.proto
index c2169a66889..c925152bd33 100644
--- a/proto/tabletmanagerdata.proto
+++ b/proto/tabletmanagerdata.proto
@@ -318,6 +318,7 @@ message StopReplicationMinimumResponse {
 }
 
 message StartReplicationRequest {
+  bool semiSync = 1;
 }
 
 message StartReplicationResponse {
diff --git a/web/vtadmin/src/proto/vtadmin.d.ts b/web/vtadmin/src/proto/vtadmin.d.ts
index 1f10c08a9ce..3914fc4b7b2 100644
--- a/web/vtadmin/src/proto/vtadmin.d.ts
+++ b/web/vtadmin/src/proto/vtadmin.d.ts
@@ -15700,6 +15700,9 @@ export namespace tabletmanagerdata {
 
     /** Properties of a StartReplicationRequest. */
     interface IStartReplicationRequest {
+
+        /** StartReplicationRequest semiSync */
+        semiSync?: (boolean|null);
     }
 
     /** Represents a StartReplicationRequest. */
@@ -15711,6 +15714,9 @@ export namespace tabletmanagerdata {
          */
         constructor(properties?: tabletmanagerdata.IStartReplicationRequest);
 
+        /** StartReplicationRequest semiSync. */
+        public semiSync: boolean;
+
         /**
          * Creates a new StartReplicationRequest instance using the specified properties.
          * @param [properties] Properties to set
diff --git a/web/vtadmin/src/proto/vtadmin.js b/web/vtadmin/src/proto/vtadmin.js
index dab9d2e4f06..58dc9b8b732 100644
--- a/web/vtadmin/src/proto/vtadmin.js
+++ b/web/vtadmin/src/proto/vtadmin.js
@@ -35932,6 +35932,7 @@ $root.tabletmanagerdata = (function() {
          * Properties of a StartReplicationRequest.
          * @memberof tabletmanagerdata
          * @interface IStartReplicationRequest
+         * @property {boolean|null} [semiSync] StartReplicationRequest semiSync
          */
 
         /**
@@ -35949,6 +35950,14 @@ $root.tabletmanagerdata = (function() {
                         this[keys[i]] = properties[keys[i]];
         }
 
+        /**
+         * StartReplicationRequest semiSync.
+         * @member {boolean} semiSync
+         * @memberof tabletmanagerdata.StartReplicationRequest
+         * @instance
+         */
+        StartReplicationRequest.prototype.semiSync = false;
+
         /**
          * Creates a new StartReplicationRequest instance using the specified properties.
          * @function create
@@ -35973,6 +35982,8 @@ $root.tabletmanagerdata = (function() {
         StartReplicationRequest.encode = function encode(message, writer) {
             if (!writer)
                 writer = $Writer.create();
+            if (message.semiSync != null && Object.hasOwnProperty.call(message, "semiSync"))
+                writer.uint32(/* id 1, wireType 0 =*/8).bool(message.semiSync);
             return writer;
         };
 
@@ -36007,6 +36018,9 @@ $root.tabletmanagerdata = (function() {
             while (reader.pos < end) {
                 var tag = reader.uint32();
                 switch (tag >>> 3) {
+                case 1:
+                    message.semiSync = reader.bool();
+                    break;
                 default:
                     reader.skipType(tag & 7);
                     break;
@@ -36042,6 +36056,9 @@ $root.tabletmanagerdata = (function() {
         StartReplicationRequest.verify = function verify(message) {
             if (typeof message !== "object" || message === null)
                 return "object expected";
+            if (message.semiSync != null && message.hasOwnProperty("semiSync"))
+                if (typeof message.semiSync !== "boolean")
+                    return "semiSync: boolean expected";
             return null;
         };
 
@@ -36056,7 +36073,10 @@ $root.tabletmanagerdata = (function() {
         StartReplicationRequest.fromObject = function fromObject(object) {
             if (object instanceof $root.tabletmanagerdata.StartReplicationRequest)
                 return object;
-            return new $root.tabletmanagerdata.StartReplicationRequest();
+            var message = new $root.tabletmanagerdata.StartReplicationRequest();
+            if (object.semiSync != null)
+                message.semiSync = Boolean(object.semiSync);
+            return message;
         };
 
         /**
@@ -36068,8 +36088,15 @@ $root.tabletmanagerdata = (function() {
          * @param {$protobuf.IConversionOptions} [options] Conversion options
          * @returns {Object.<string,*>} Plain object
          */
-        StartReplicationRequest.toObject = function toObject() {
-            return {};
+        StartReplicationRequest.toObject = function toObject(message, options) {
+            if (!options)
+                options = {};
+            var object = {};
+            if (options.defaults)
+                object.semiSync = false;
+            if (message.semiSync != null && message.hasOwnProperty("semiSync"))
+                object.semiSync = message.semiSync;
+            return object;
         };
 
         /**

From a696c9830233a38eeb0cbb5181d8a7db59464173 Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Sat, 22 Jan 2022 16:44:57 +0530
Subject: [PATCH 17/30] test: fix TestChangeTabletType to have the primary
 tablet setup in topo

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 go/vt/vtctl/grpcvtctldserver/server_test.go | 87 ++++++++++++++++++---
 1 file changed, 76 insertions(+), 11 deletions(-)

diff --git a/go/vt/vtctl/grpcvtctldserver/server_test.go b/go/vt/vtctl/grpcvtctldserver/server_test.go
index e8af50cbb39..92895235573 100644
--- a/go/vt/vtctl/grpcvtctldserver/server_test.go
+++ b/go/vt/vtctl/grpcvtctldserver/server_test.go
@@ -503,7 +503,17 @@ func TestChangeTabletType(t *testing.T) {
 						Cell: "zone1",
 						Uid:  100,
 					},
-					Type: topodatapb.TabletType_REPLICA,
+					Keyspace: "ks",
+					Shard:    "0",
+					Type:     topodatapb.TabletType_REPLICA,
+				}, {
+					Alias: &topodatapb.TabletAlias{
+						Cell: "zone1",
+						Uid:  101,
+					},
+					Keyspace: "ks",
+					Shard:    "0",
+					Type:     topodatapb.TabletType_PRIMARY,
 				},
 			},
 			req: &vtctldatapb.ChangeTabletTypeRequest{
@@ -519,14 +529,18 @@ func TestChangeTabletType(t *testing.T) {
 						Cell: "zone1",
 						Uid:  100,
 					},
-					Type: topodatapb.TabletType_REPLICA,
+					Keyspace: "ks",
+					Shard:    "0",
+					Type:     topodatapb.TabletType_REPLICA,
 				},
 				AfterTablet: &topodatapb.Tablet{
 					Alias: &topodatapb.TabletAlias{
 						Cell: "zone1",
 						Uid:  100,
 					},
-					Type: topodatapb.TabletType_RDONLY,
+					Keyspace: "ks",
+					Shard:    "0",
+					Type:     topodatapb.TabletType_RDONLY,
 				},
 				WasDryRun: false,
 			},
@@ -541,7 +555,17 @@ func TestChangeTabletType(t *testing.T) {
 						Cell: "zone1",
 						Uid:  100,
 					},
-					Type: topodatapb.TabletType_REPLICA,
+					Keyspace: "ks",
+					Shard:    "0",
+					Type:     topodatapb.TabletType_REPLICA,
+				}, {
+					Alias: &topodatapb.TabletAlias{
+						Cell: "zone1",
+						Uid:  101,
+					},
+					Keyspace: "ks",
+					Shard:    "0",
+					Type:     topodatapb.TabletType_PRIMARY,
 				},
 			},
 			req: &vtctldatapb.ChangeTabletTypeRequest{
@@ -558,14 +582,18 @@ func TestChangeTabletType(t *testing.T) {
 						Cell: "zone1",
 						Uid:  100,
 					},
-					Type: topodatapb.TabletType_REPLICA,
+					Keyspace: "ks",
+					Shard:    "0",
+					Type:     topodatapb.TabletType_REPLICA,
 				},
 				AfterTablet: &topodatapb.Tablet{
 					Alias: &topodatapb.TabletAlias{
 						Cell: "zone1",
 						Uid:  100,
 					},
-					Type: topodatapb.TabletType_RDONLY,
+					Keyspace: "ks",
+					Shard:    "0",
+					Type:     topodatapb.TabletType_RDONLY,
 				},
 				WasDryRun: true,
 			},
@@ -580,7 +608,17 @@ func TestChangeTabletType(t *testing.T) {
 						Cell: "zone1",
 						Uid:  200,
 					},
-					Type: topodatapb.TabletType_REPLICA,
+					Keyspace: "ks",
+					Shard:    "0",
+					Type:     topodatapb.TabletType_REPLICA,
+				}, {
+					Alias: &topodatapb.TabletAlias{
+						Cell: "zone1",
+						Uid:  101,
+					},
+					Keyspace: "ks",
+					Shard:    "0",
+					Type:     topodatapb.TabletType_PRIMARY,
 				},
 			},
 			req: &vtctldatapb.ChangeTabletTypeRequest{
@@ -602,7 +640,17 @@ func TestChangeTabletType(t *testing.T) {
 						Cell: "zone1",
 						Uid:  100,
 					},
-					Type: topodatapb.TabletType_REPLICA,
+					Keyspace: "ks",
+					Shard:    "0",
+					Type:     topodatapb.TabletType_REPLICA,
+				}, {
+					Alias: &topodatapb.TabletAlias{
+						Cell: "zone1",
+						Uid:  101,
+					},
+					Keyspace: "ks",
+					Shard:    "0",
+					Type:     topodatapb.TabletType_PRIMARY,
 				},
 			},
 			req: &vtctldatapb.ChangeTabletTypeRequest{
@@ -624,7 +672,9 @@ func TestChangeTabletType(t *testing.T) {
 						Cell: "zone1",
 						Uid:  100,
 					},
-					Type: topodatapb.TabletType_PRIMARY,
+					Keyspace: "ks",
+					Shard:    "0",
+					Type:     topodatapb.TabletType_PRIMARY,
 				},
 			},
 			req: &vtctldatapb.ChangeTabletTypeRequest{
@@ -651,7 +701,9 @@ func TestChangeTabletType(t *testing.T) {
 				TopoServer: ts,
 			}, func(ts *topo.Server) vtctlservicepb.VtctldServer { return NewVtctldServer(ts) })
 
-			testutil.AddTablets(ctx, t, ts, nil, tt.tablets...)
+			testutil.AddTablets(ctx, t, ts, &testutil.AddTabletOptions{
+				AlsoSetShardPrimary: true,
+			}, tt.tablets...)
 
 			resp, err := vtctld.ChangeTabletType(ctx, tt.req)
 			if tt.shouldErr {
@@ -699,8 +751,21 @@ func TestChangeTabletType(t *testing.T) {
 				Cell: "zone1",
 				Uid:  100,
 			},
-			Type: topodatapb.TabletType_REPLICA,
+			Keyspace: "ks",
+			Shard:    "0",
+			Type:     topodatapb.TabletType_REPLICA,
 		}, nil)
+		testutil.AddTablet(ctx, t, ts, &topodatapb.Tablet{
+			Alias: &topodatapb.TabletAlias{
+				Cell: "zone1",
+				Uid:  101,
+			},
+			Keyspace: "ks",
+			Shard:    "0",
+			Type:     topodatapb.TabletType_PRIMARY,
+		}, &testutil.AddTabletOptions{
+			AlsoSetShardPrimary: true,
+		})
 
 		_, err := vtctld.ChangeTabletType(ctx, &vtctldatapb.ChangeTabletTypeRequest{
 			TabletAlias: &topodatapb.TabletAlias{

From c5e61361bf75cbfe25d4977b1836430c4fb56784 Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Sat, 22 Jan 2022 16:55:57 +0530
Subject: [PATCH 18/30] test: fix TestStartReplication to have the primary
 tablet setup in topo

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 go/vt/vtctl/grpcvtctldserver/server_test.go | 36 ++++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)

diff --git a/go/vt/vtctl/grpcvtctldserver/server_test.go b/go/vt/vtctl/grpcvtctldserver/server_test.go
index 92895235573..7cf80f081e9 100644
--- a/go/vt/vtctl/grpcvtctldserver/server_test.go
+++ b/go/vt/vtctl/grpcvtctldserver/server_test.go
@@ -8138,6 +8138,14 @@ func TestStartReplication(t *testing.T) {
 					Keyspace: "testkeyspace",
 					Shard:    "-",
 					Type:     topodatapb.TabletType_REPLICA,
+				}, {
+					Alias: &topodatapb.TabletAlias{
+						Cell: "zone1",
+						Uid:  101,
+					},
+					Keyspace: "testkeyspace",
+					Shard:    "-",
+					Type:     topodatapb.TabletType_PRIMARY,
 				},
 			},
 			tmc: testutil.TabletManagerClient{
@@ -8164,6 +8172,14 @@ func TestStartReplication(t *testing.T) {
 					Keyspace: "testkeyspace",
 					Shard:    "-",
 					Type:     topodatapb.TabletType_REPLICA,
+				}, {
+					Alias: &topodatapb.TabletAlias{
+						Cell: "zone1",
+						Uid:  101,
+					},
+					Keyspace: "testkeyspace",
+					Shard:    "-",
+					Type:     topodatapb.TabletType_PRIMARY,
 				},
 			},
 			tmc: testutil.TabletManagerClient{
@@ -8191,6 +8207,14 @@ func TestStartReplication(t *testing.T) {
 					Keyspace: "testkeyspace",
 					Shard:    "-",
 					Type:     topodatapb.TabletType_REPLICA,
+				}, {
+					Alias: &topodatapb.TabletAlias{
+						Cell: "zone1",
+						Uid:  101,
+					},
+					Keyspace: "testkeyspace",
+					Shard:    "-",
+					Type:     topodatapb.TabletType_PRIMARY,
 				},
 			},
 			tmc: testutil.TabletManagerClient{
@@ -8218,6 +8242,14 @@ func TestStartReplication(t *testing.T) {
 					Keyspace: "testkeyspace",
 					Shard:    "-",
 					Type:     topodatapb.TabletType_REPLICA,
+				}, {
+					Alias: &topodatapb.TabletAlias{
+						Cell: "zone1",
+						Uid:  101,
+					},
+					Keyspace: "testkeyspace",
+					Shard:    "-",
+					Type:     topodatapb.TabletType_PRIMARY,
 				},
 			},
 			req:       &vtctldatapb.StartReplicationRequest{},
@@ -8234,7 +8266,9 @@ func TestStartReplication(t *testing.T) {
 			ts := memorytopo.NewServer(tt.cells...)
 			defer ts.Close()
 
-			testutil.AddTablets(ctx, t, ts, nil, tt.tablets...)
+			testutil.AddTablets(ctx, t, ts, &testutil.AddTabletOptions{
+				AlsoSetShardPrimary: true,
+			}, tt.tablets...)
 			vtctld := testutil.NewVtctldServerWithTabletManagerClient(t, ts, &tt.tmc, func(ts *topo.Server) vtctlservicepb.VtctldServer {
 				return NewVtctldServer(ts)
 			})

From db477a179f931d640c3195d6d9fd41b615dcaf00 Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Sat, 22 Jan 2022 17:18:00 +0530
Subject: [PATCH 19/30] test: add SettingDurabilityPolicies in init function
 for vtworker tests

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 go/vt/worker/vertical_split_clone_test.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/go/vt/worker/vertical_split_clone_test.go b/go/vt/worker/vertical_split_clone_test.go
index ef309536539..cc643793b3d 100644
--- a/go/vt/worker/vertical_split_clone_test.go
+++ b/go/vt/worker/vertical_split_clone_test.go
@@ -28,6 +28,7 @@ import (
 	"vitess.io/vitess/go/vt/topo/memorytopo"
 	"vitess.io/vitess/go/vt/topo/topoproto"
 	"vitess.io/vitess/go/vt/topotools"
+	"vitess.io/vitess/go/vt/vtctl/reparentutil"
 	"vitess.io/vitess/go/vt/vttablet/grpcqueryservice"
 	"vitess.io/vitess/go/vt/vttablet/queryservice/fakes"
 	"vitess.io/vitess/go/vt/wrangler/testlib"
@@ -56,6 +57,10 @@ func createVerticalSplitCloneDestinationFakeDb(t *testing.T, name string, insert
 	return f
 }
 
+func init() {
+	_ = reparentutil.SetDurabilityPolicy("none", nil)
+}
+
 // TestVerticalSplitClone will run VerticalSplitClone in the combined
 // online and offline mode. The online phase will copy 100 rows from the source
 // to the destination and the offline phase won't copy any rows as the source

From 243bfc3f6b7c0a0797776eab77b509e8674b856d Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Sat, 22 Jan 2022 18:26:35 +0530
Subject: [PATCH 20/30] test: SetDurabilityPolicies in endtoend tests for
 InitShardPrimary

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 .../vtctl/grpcvtctldserver/endtoend/init_shard_primary_test.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/go/vt/vtctl/grpcvtctldserver/endtoend/init_shard_primary_test.go b/go/vt/vtctl/grpcvtctldserver/endtoend/init_shard_primary_test.go
index 52aad94d9a6..270f09e139c 100644
--- a/go/vt/vtctl/grpcvtctldserver/endtoend/init_shard_primary_test.go
+++ b/go/vt/vtctl/grpcvtctldserver/endtoend/init_shard_primary_test.go
@@ -29,6 +29,7 @@ import (
 	"vitess.io/vitess/go/vt/logutil"
 	"vitess.io/vitess/go/vt/topo/memorytopo"
 	"vitess.io/vitess/go/vt/vtctl/grpcvtctldserver"
+	"vitess.io/vitess/go/vt/vtctl/reparentutil"
 	"vitess.io/vitess/go/vt/vttablet/tabletservermock"
 	"vitess.io/vitess/go/vt/vttablet/tmclient"
 	"vitess.io/vitess/go/vt/wrangler"
@@ -42,6 +43,7 @@ func TestInitShardPrimary(t *testing.T) {
 	ts := memorytopo.NewServer("cell1")
 	tmc := tmclient.NewTabletManagerClient()
 	wr := wrangler.New(logutil.NewConsoleLogger(), ts, tmc)
+	_ = reparentutil.SetDurabilityPolicy("none", nil)
 
 	primaryDb := fakesqldb.New(t)
 	primaryDb.AddQuery("create database if not exists `vt_test_keyspace`", &sqltypes.Result{InsertID: 0, RowsAffected: 0})
@@ -101,6 +103,7 @@ func TestInitShardPrimaryNoFormerPrimary(t *testing.T) {
 	ts := memorytopo.NewServer("cell1")
 	tmc := tmclient.NewTabletManagerClient()
 	wr := wrangler.New(logutil.NewConsoleLogger(), ts, tmc)
+	_ = reparentutil.SetDurabilityPolicy("none", nil)
 
 	primaryDb := fakesqldb.New(t)
 	primaryDb.AddQuery("create database if not exists `vt_test_keyspace`", &sqltypes.Result{InsertID: 0, RowsAffected: 0})

From 9fb94ec89006f470f164323597fe42b38657eaab Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Sat, 22 Jan 2022 20:12:16 +0530
Subject: [PATCH 21/30] test: add semi-sync durability flag to all the e2e
 tests using semi-sync

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 go/test/endtoend/backup/transform/backup_transform_utils.go   | 1 +
 go/test/endtoend/backup/vtbackup/main_test.go                 | 1 +
 go/test/endtoend/backup/vtctlbackup/backup_utils.go           | 1 +
 go/test/endtoend/recovery/pitr/shardedpitr_test.go            | 1 +
 go/test/endtoend/recovery/pitrtls/shardedpitr_tls_test.go     | 1 +
 .../recovery/shardedrecovery/sharded_recovery_test.go         | 1 +
 go/test/endtoend/recovery/unshardedrecovery/recovery.go       | 1 +
 go/test/endtoend/reparent/newfeaturetest/reparent_test.go     | 2 ++
 go/test/endtoend/reparent/utils/utils.go                      | 4 +---
 go/test/endtoend/sharding/initialsharding/sharding_util.go    | 1 +
 go/test/endtoend/sharding/mergesharding/mergesharding_base.go | 1 +
 go/test/endtoend/sharding/resharding/resharding_base.go       | 1 +
 go/test/endtoend/vault/vault_test.go                          | 1 +
 13 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/go/test/endtoend/backup/transform/backup_transform_utils.go b/go/test/endtoend/backup/transform/backup_transform_utils.go
index d9af72ea66c..bd5bab56474 100644
--- a/go/test/endtoend/backup/transform/backup_transform_utils.go
+++ b/go/test/endtoend/backup/transform/backup_transform_utils.go
@@ -68,6 +68,7 @@ func TestMainSetup(m *testing.M, useMysqlctld bool) {
 		localCluster = cluster.NewCluster(cell, hostname)
 		defer localCluster.Teardown()
 
+		localCluster.VtctldExtraArgs = append(localCluster.VtctldExtraArgs, "-durability=semi_sync")
 		// Start topo server
 		err := localCluster.StartTopo()
 		if err != nil {
diff --git a/go/test/endtoend/backup/vtbackup/main_test.go b/go/test/endtoend/backup/vtbackup/main_test.go
index a9df0c97675..2617a579c03 100644
--- a/go/test/endtoend/backup/vtbackup/main_test.go
+++ b/go/test/endtoend/backup/vtbackup/main_test.go
@@ -61,6 +61,7 @@ func TestMain(m *testing.M) {
 		localCluster = cluster.NewCluster(cell, hostname)
 		defer localCluster.Teardown()
 
+		localCluster.VtctldExtraArgs = append(localCluster.VtctldExtraArgs, "-durability=semi_sync")
 		// Start topo server
 		err := localCluster.StartTopo()
 		if err != nil {
diff --git a/go/test/endtoend/backup/vtctlbackup/backup_utils.go b/go/test/endtoend/backup/vtctlbackup/backup_utils.go
index 7d84b00ce85..97bd275fc7e 100644
--- a/go/test/endtoend/backup/vtctlbackup/backup_utils.go
+++ b/go/test/endtoend/backup/vtctlbackup/backup_utils.go
@@ -83,6 +83,7 @@ var (
 // LaunchCluster : starts the cluster as per given params.
 func LaunchCluster(setupType int, streamMode string, stripes int) (int, error) {
 	localCluster = cluster.NewCluster(cell, hostname)
+	localCluster.VtctldExtraArgs = append(localCluster.VtctldExtraArgs, "-durability=semi_sync")
 
 	// Start topo server
 	err := localCluster.StartTopo()
diff --git a/go/test/endtoend/recovery/pitr/shardedpitr_test.go b/go/test/endtoend/recovery/pitr/shardedpitr_test.go
index 4096e1649fd..e665d84bf2b 100644
--- a/go/test/endtoend/recovery/pitr/shardedpitr_test.go
+++ b/go/test/endtoend/recovery/pitr/shardedpitr_test.go
@@ -371,6 +371,7 @@ func removeTablets(t *testing.T, tablets []*cluster.Vttablet) {
 
 func initializeCluster(t *testing.T) {
 	clusterInstance = cluster.NewCluster(cell, hostname)
+	clusterInstance.VtctldExtraArgs = append(clusterInstance.VtctldExtraArgs, "-durability=semi_sync")
 
 	// Start topo server
 	err := clusterInstance.StartTopo()
diff --git a/go/test/endtoend/recovery/pitrtls/shardedpitr_tls_test.go b/go/test/endtoend/recovery/pitrtls/shardedpitr_tls_test.go
index 4df09bd8243..a07e1349956 100644
--- a/go/test/endtoend/recovery/pitrtls/shardedpitr_tls_test.go
+++ b/go/test/endtoend/recovery/pitrtls/shardedpitr_tls_test.go
@@ -108,6 +108,7 @@ func removeTablets(t *testing.T, tablets []*cluster.Vttablet) {
 
 func initializeCluster(t *testing.T) {
 	clusterInstance = cluster.NewCluster(cell, hostname)
+	clusterInstance.VtctldExtraArgs = append(clusterInstance.VtctldExtraArgs, "-durability=semi_sync")
 
 	// Start topo server
 	err := clusterInstance.StartTopo()
diff --git a/go/test/endtoend/recovery/shardedrecovery/sharded_recovery_test.go b/go/test/endtoend/recovery/shardedrecovery/sharded_recovery_test.go
index 34d63c70716..824417cb6bc 100644
--- a/go/test/endtoend/recovery/shardedrecovery/sharded_recovery_test.go
+++ b/go/test/endtoend/recovery/shardedrecovery/sharded_recovery_test.go
@@ -466,6 +466,7 @@ func removeTablets(t *testing.T, tablets []*cluster.Vttablet) {
 func initializeCluster(t *testing.T) (int, error) {
 
 	localCluster = cluster.NewCluster(cell, hostname)
+	localCluster.VtctldExtraArgs = append(localCluster.VtctldExtraArgs, "-durability=semi_sync")
 
 	// Start topo server
 	err := localCluster.StartTopo()
diff --git a/go/test/endtoend/recovery/unshardedrecovery/recovery.go b/go/test/endtoend/recovery/unshardedrecovery/recovery.go
index 9a5b21bf53a..0c0830bb0f5 100644
--- a/go/test/endtoend/recovery/unshardedrecovery/recovery.go
+++ b/go/test/endtoend/recovery/unshardedrecovery/recovery.go
@@ -82,6 +82,7 @@ func TestMainImpl(m *testing.M) {
 		localCluster = cluster.NewCluster(cell, hostname)
 		defer localCluster.Teardown()
 
+		localCluster.VtctldExtraArgs = append(localCluster.VtctldExtraArgs, "-durability=semi_sync")
 		// Start topo server
 		err := localCluster.StartTopo()
 		if err != nil {
diff --git a/go/test/endtoend/reparent/newfeaturetest/reparent_test.go b/go/test/endtoend/reparent/newfeaturetest/reparent_test.go
index 4d471591605..cbe60d06165 100644
--- a/go/test/endtoend/reparent/newfeaturetest/reparent_test.go
+++ b/go/test/endtoend/reparent/newfeaturetest/reparent_test.go
@@ -37,6 +37,7 @@ func TestPRSForInitialization(t *testing.T) {
 	var tablets []*cluster.Vttablet
 	clusterInstance := cluster.NewCluster("zone1", "localhost")
 	keyspace := &cluster.Keyspace{Name: utils.KeyspaceName}
+	clusterInstance.VtctldExtraArgs = append(clusterInstance.VtctldExtraArgs, "-durability=semi_sync")
 	// Start topo server
 	err := clusterInstance.StartTopo()
 	require.NoError(t, err)
@@ -253,6 +254,7 @@ func TestERSForInitialization(t *testing.T) {
 	var tablets []*cluster.Vttablet
 	clusterInstance := cluster.NewCluster("zone1", "localhost")
 	keyspace := &cluster.Keyspace{Name: utils.KeyspaceName}
+	clusterInstance.VtctldExtraArgs = append(clusterInstance.VtctldExtraArgs, "-durability=semi_sync")
 	// Start topo server
 	err := clusterInstance.StartTopo()
 	require.NoError(t, err)
diff --git a/go/test/endtoend/reparent/utils/utils.go b/go/test/endtoend/reparent/utils/utils.go
index f8c18c5e8ad..91ff4349704 100644
--- a/go/test/endtoend/reparent/utils/utils.go
+++ b/go/test/endtoend/reparent/utils/utils.go
@@ -134,9 +134,7 @@ func setupCluster(ctx context.Context, t *testing.T, shardName string, cells []s
 		// If the initSchema acquires the lock, then it takes about 30 seconds for it to run during which time the
 		// DemotePrimary rpc is stalled!
 		"-queryserver_enable_online_ddl=false")
-	if enableSemiSync {
-		clusterInstance.VtTabletExtraArgs = append(clusterInstance.VtTabletExtraArgs, "-enable_semi_sync")
-	}
+
 	if clusterInstance.VtTabletMajorVersion >= 13 && clusterInstance.VtctlMajorVersion >= 13 {
 		// disabling active reparents on the tablet since we don't want the replication manager
 		// to fix replication if it is stopped. Some tests deliberately do that. Also, we don't want
diff --git a/go/test/endtoend/sharding/initialsharding/sharding_util.go b/go/test/endtoend/sharding/initialsharding/sharding_util.go
index 825100ca00d..feabfa2c008 100644
--- a/go/test/endtoend/sharding/initialsharding/sharding_util.go
+++ b/go/test/endtoend/sharding/initialsharding/sharding_util.go
@@ -96,6 +96,7 @@ func ClusterWrapper(isMulti bool) (int, error) {
 	ClusterInstance = nil
 	ClusterInstance = cluster.NewCluster(cell, hostname)
 
+	ClusterInstance.VtctldExtraArgs = append(ClusterInstance.VtctldExtraArgs, "-durability=semi_sync")
 	// Start topo server
 	if err := ClusterInstance.StartTopo(); err != nil {
 		return 1, err
diff --git a/go/test/endtoend/sharding/mergesharding/mergesharding_base.go b/go/test/endtoend/sharding/mergesharding/mergesharding_base.go
index d64277f616f..012f19b4b46 100644
--- a/go/test/endtoend/sharding/mergesharding/mergesharding_base.go
+++ b/go/test/endtoend/sharding/mergesharding/mergesharding_base.go
@@ -107,6 +107,7 @@ func TestMergesharding(t *testing.T, useVarbinaryShardingKeyType bool) {
 
 	// Launch keyspace
 	keyspace := &cluster.Keyspace{Name: keyspaceName}
+	clusterInstance.VtctldExtraArgs = append(clusterInstance.VtctldExtraArgs, "-durability=semi_sync")
 
 	// Start topo server
 	err := clusterInstance.StartTopo()
diff --git a/go/test/endtoend/sharding/resharding/resharding_base.go b/go/test/endtoend/sharding/resharding/resharding_base.go
index 36aa38df74f..d5e0066405f 100644
--- a/go/test/endtoend/sharding/resharding/resharding_base.go
+++ b/go/test/endtoend/sharding/resharding/resharding_base.go
@@ -190,6 +190,7 @@ func TestResharding(t *testing.T, useVarbinaryShardingKeyType bool) {
 
 	// Launch keyspace
 	keyspace := &cluster.Keyspace{Name: keyspaceName}
+	clusterInstance.VtctldExtraArgs = append(clusterInstance.VtctldExtraArgs, "-durability=semi_sync")
 
 	// Start topo server
 	err := clusterInstance.StartTopo()
diff --git a/go/test/endtoend/vault/vault_test.go b/go/test/endtoend/vault/vault_test.go
index c531985f5d9..ecaea49938c 100644
--- a/go/test/endtoend/vault/vault_test.go
+++ b/go/test/endtoend/vault/vault_test.go
@@ -218,6 +218,7 @@ func setupVaultServer(t *testing.T, vs *VaultServer) (string, string) {
 func initializeClusterEarly(t *testing.T) {
 	clusterInstance = cluster.NewCluster(cell, hostname)
 
+	clusterInstance.VtctldExtraArgs = append(clusterInstance.VtctldExtraArgs, "-durability=semi_sync")
 	// Start topo server
 	err := clusterInstance.StartTopo()
 	require.NoError(t, err)

From 8a75a7bb4cbe3dbb807fe2072efe90dde9fbd310 Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Sat, 22 Jan 2022 21:06:49 +0530
Subject: [PATCH 22/30] feat: In ChangeTabletType we should query the
 durability rules with the changed type and not with the original

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 go/vt/vtctl/grpcvtctldserver/server.go | 6 +++++-
 go/vt/wrangler/tablet.go               | 7 ++++++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/go/vt/vtctl/grpcvtctldserver/server.go b/go/vt/vtctl/grpcvtctldserver/server.go
index fcd3481e845..d69e99ecbfe 100644
--- a/go/vt/vtctl/grpcvtctldserver/server.go
+++ b/go/vt/vtctl/grpcvtctldserver/server.go
@@ -282,7 +282,11 @@ func (s *VtctldServer) ChangeTabletType(ctx context.Context, req *vtctldatapb.Ch
 		return nil, vterrors.Errorf(vtrpc.Code_FAILED_PRECONDITION, "primary %v and potential replica %v not in same keypace shard (%v/%v)", topoproto.TabletAliasString(shard.PrimaryAlias), req.TabletAlias, tablet.Keyspace, tablet.Shard)
 	}
 
-	err = s.tmc.ChangeType(ctx, tablet.Tablet, req.DbType, reparentutil.ReplicaSemiSync(shardPrimary.Tablet, tablet.Tablet))
+	// We should clone the tablet and change its type to the expected type before checking the durability rules
+	// Since we want to check the durability rules for the desired state and not before we make that change
+	expectedTablet := proto.Clone(tablet.Tablet).(*topodatapb.Tablet)
+	expectedTablet.Type = req.DbType
+	err = s.tmc.ChangeType(ctx, tablet.Tablet, req.DbType, reparentutil.ReplicaSemiSync(shardPrimary.Tablet, expectedTablet))
 	if err != nil {
 		return nil, err
 	}
diff --git a/go/vt/wrangler/tablet.go b/go/vt/wrangler/tablet.go
index 36453baef59..dbac6e37181 100644
--- a/go/vt/wrangler/tablet.go
+++ b/go/vt/wrangler/tablet.go
@@ -174,7 +174,12 @@ func (wr *Wrangler) ChangeTabletType(ctx context.Context, tabletAlias *topodatap
 		return fmt.Errorf("tablet %v type change %v -> %v is not an allowed transition for ChangeTabletType", tabletAlias, ti.Type, tabletType)
 	}
 
-	semiSync, err := wr.shouldSendSemiSyncAck(ctx, ti.Tablet)
+	// We should clone the tablet and change its type to the expected type before checking the durability rules
+	// Since we want to check the durability rules for the desired state and not before we make that change
+	expectedTablet := proto.Clone(ti.Tablet).(*topodatapb.Tablet)
+	expectedTablet.Type = tabletType
+	semiSync, err := wr.shouldSendSemiSyncAck(ctx, expectedTablet)
+
 	if err != nil {
 		return err
 	}

From 128a52c3230516ce62b5663f532b5642bfa2fd1e Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Sat, 22 Jan 2022 21:29:45 +0530
Subject: [PATCH 23/30] test: only add the durability flag to vtctl if major
 version exceeds 13

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 go/test/endtoend/reparent/utils/utils.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/go/test/endtoend/reparent/utils/utils.go b/go/test/endtoend/reparent/utils/utils.go
index 91ff4349704..3b473e44343 100644
--- a/go/test/endtoend/reparent/utils/utils.go
+++ b/go/test/endtoend/reparent/utils/utils.go
@@ -309,7 +309,10 @@ func ErsIgnoreTablet(clusterInstance *cluster.LocalProcessCluster, tab *cluster.
 
 // ErsWithVtctl runs ERS via vtctl binary
 func ErsWithVtctl(clusterInstance *cluster.LocalProcessCluster) (string, error) {
-	args := []string{"-durability=semi_sync", "EmergencyReparentShard", "-keyspace_shard", fmt.Sprintf("%s/%s", KeyspaceName, ShardName)}
+	args := []string{"EmergencyReparentShard", "-keyspace_shard", fmt.Sprintf("%s/%s", KeyspaceName, ShardName)}
+	if clusterInstance.VtctlMajorVersion >= 13 {
+		args = append([]string{"-durability=semi_sync"}, args...)
+	}
 	return clusterInstance.VtctlProcess.ExecuteCommandWithOutput(args...)
 }
 

From ffbef3f427cbc9acdebd2ce7ea6b945861ed5045 Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Sat, 22 Jan 2022 21:57:55 +0530
Subject: [PATCH 24/30] feat: fix demotePrimary to preserve behaviour

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 go/vt/vttablet/tabletmanager/rpc_replication.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/go/vt/vttablet/tabletmanager/rpc_replication.go b/go/vt/vttablet/tabletmanager/rpc_replication.go
index 467113d2828..628c616b134 100644
--- a/go/vt/vttablet/tabletmanager/rpc_replication.go
+++ b/go/vt/vttablet/tabletmanager/rpc_replication.go
@@ -477,7 +477,7 @@ func (tm *TabletManager) demotePrimary(ctx context.Context, revertPartialFailure
 
 	if tm.isPrimarySideSemiSyncEnabled() {
 		// If using semi-sync, we need to disable primary-side.
-		if err := tm.fixSemiSync(topodatapb.TabletType_REPLICA, SemiSyncActionFalse); err != nil {
+		if err := tm.fixSemiSync(topodatapb.TabletType_REPLICA, SemiSyncActionTrue); err != nil {
 			return nil, err
 		}
 		defer func() {

From b19bdda8301774c721b15e12bde38242d2a9ae0f Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Sat, 22 Jan 2022 22:01:05 +0530
Subject: [PATCH 25/30] feat: do not log error messages when SemiSyncActionNone

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 go/vt/vttablet/tabletmanager/rpc_replication.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/go/vt/vttablet/tabletmanager/rpc_replication.go b/go/vt/vttablet/tabletmanager/rpc_replication.go
index 628c616b134..fd4dbfd88e3 100644
--- a/go/vt/vttablet/tabletmanager/rpc_replication.go
+++ b/go/vt/vttablet/tabletmanager/rpc_replication.go
@@ -902,7 +902,7 @@ func (tm *TabletManager) fixSemiSync(tabletType topodatapb.TabletType, semiSync
 		return tm.MysqlDaemon.SetSemiSyncEnabled(false, false)
 	}
 
-	if semiSync != SemiSyncActionTrue {
+	if semiSync == SemiSyncActionFalse {
 		log.Error("invalid configuration - enabling semi sync even though not specified by durability policies. Possibly in the process of upgrading.")
 	}
 	// Always enable replica-side since it doesn't hurt to keep it on for a primary.

From ddcaa78e8117f7f31aeba57c9484a20218ea8789 Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Sat, 22 Jan 2022 22:03:02 +0530
Subject: [PATCH 26/30] test: add test for checking logs in fixSemiSync

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 .../tabletmanager/rpc_replication_test.go     | 119 ++++++++++++++++++
 1 file changed, 119 insertions(+)

diff --git a/go/vt/vttablet/tabletmanager/rpc_replication_test.go b/go/vt/vttablet/tabletmanager/rpc_replication_test.go
index a6cf48a6a61..b9608bc7ed2 100644
--- a/go/vt/vttablet/tabletmanager/rpc_replication_test.go
+++ b/go/vt/vttablet/tabletmanager/rpc_replication_test.go
@@ -17,11 +17,16 @@ limitations under the License.
 package tabletmanager
 
 import (
+	"bytes"
 	"context"
+	"io"
+	"os"
 	"testing"
 
 	"github.com/stretchr/testify/require"
 
+	"vitess.io/vitess/go/vt/mysqlctl/fakemysqldaemon"
+	"vitess.io/vitess/go/vt/proto/topodata"
 	"vitess.io/vitess/go/vt/topo/memorytopo"
 )
 
@@ -38,3 +43,117 @@ func TestPromoteReplicaHealthTicksStopped(t *testing.T) {
 	require.NoError(t, err)
 	require.False(t, tm.replManager.ticks.Running())
 }
+
+func captureStderr(f func()) (string, error) {
+	old := os.Stderr // keep backup of the real stderr
+	r, w, err := os.Pipe()
+	if err != nil {
+		return "", err
+	}
+	os.Stderr = w
+
+	outC := make(chan string)
+	// copy the output in a separate goroutine so printing can't block indefinitely
+	go func() {
+		var buf bytes.Buffer
+		io.Copy(&buf, r)
+		outC <- buf.String()
+	}()
+
+	// calling function which stderr we are going to capture:
+	f()
+
+	// back to normal state
+	w.Close()
+	os.Stderr = old // restoring the real stderr
+	return <-outC, nil
+}
+
+func TestTabletManager_fixSemiSync(t *testing.T) {
+	tests := []struct {
+		name                 string
+		tabletType           topodata.TabletType
+		semiSync             SemiSyncAction
+		logOutput            string
+		shouldEnableSemiSync bool
+	}{
+		{
+			name:                 "enableSemiSync=true(primary eligible),durabilitySemiSync=true",
+			tabletType:           topodata.TabletType_REPLICA,
+			semiSync:             SemiSyncActionTrue,
+			logOutput:            "",
+			shouldEnableSemiSync: true,
+		}, {
+			name:                 "enableSemiSync=true(primary eligible),durabilitySemiSync=false",
+			tabletType:           topodata.TabletType_REPLICA,
+			semiSync:             SemiSyncActionFalse,
+			logOutput:            "invalid configuration - enabling semi sync even though not specified by durability policies.",
+			shouldEnableSemiSync: true,
+		}, {
+			name:                 "enableSemiSync=true(primary eligible),durabilitySemiSync=none",
+			tabletType:           topodata.TabletType_REPLICA,
+			semiSync:             SemiSyncActionNone,
+			logOutput:            "",
+			shouldEnableSemiSync: true,
+		}, {
+			name:                 "enableSemiSync=true(primary not-eligible),durabilitySemiSync=true",
+			tabletType:           topodata.TabletType_DRAINED,
+			semiSync:             SemiSyncActionTrue,
+			logOutput:            "invalid configuration - semi-sync should be setup according to durability policies, but the tablet is not primaryEligible",
+			shouldEnableSemiSync: true,
+		}, {
+			name:                 "enableSemiSync=true(primary not-eligible),durabilitySemiSync=false",
+			tabletType:           topodata.TabletType_DRAINED,
+			semiSync:             SemiSyncActionFalse,
+			logOutput:            "",
+			shouldEnableSemiSync: true,
+		}, {
+			name:                 "enableSemiSync=true(primary not-eligible),durabilitySemiSync=none",
+			tabletType:           topodata.TabletType_DRAINED,
+			semiSync:             SemiSyncActionNone,
+			logOutput:            "",
+			shouldEnableSemiSync: true,
+		}, {
+			name:                 "enableSemiSync=false,durabilitySemiSync=true",
+			tabletType:           topodata.TabletType_REPLICA,
+			semiSync:             SemiSyncActionTrue,
+			logOutput:            "invalid configuration - semi-sync should be setup according to durability policies, but enable_semi_sync is not set",
+			shouldEnableSemiSync: false,
+		}, {
+			name:                 "enableSemiSync=false,durabilitySemiSync=false",
+			tabletType:           topodata.TabletType_REPLICA,
+			semiSync:             SemiSyncActionFalse,
+			logOutput:            "",
+			shouldEnableSemiSync: false,
+		}, {
+			name:                 "enableSemiSync=false,durabilitySemiSync=none",
+			tabletType:           topodata.TabletType_REPLICA,
+			semiSync:             SemiSyncActionNone,
+			logOutput:            "",
+			shouldEnableSemiSync: false,
+		},
+	}
+	oldEnableSemiSync := *enableSemiSync
+	defer func() {
+		*enableSemiSync = oldEnableSemiSync
+	}()
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			*enableSemiSync = tt.shouldEnableSemiSync
+			fakeMysql := fakemysqldaemon.NewFakeMysqlDaemon(nil)
+			tm := &TabletManager{
+				MysqlDaemon: fakeMysql,
+			}
+			logOutput, err := captureStderr(func() {
+				err := tm.fixSemiSync(tt.tabletType, tt.semiSync)
+				require.NoError(t, err)
+			})
+			require.NoError(t, err)
+			if tt.logOutput != "" {
+				require.Contains(t, logOutput, tt.logOutput)
+			} else {
+				require.Equal(t, "", logOutput)
+			}
+		})
+	}
+}

From 41acb371ae0de065152a4b8affa67b37a59987b2 Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Tue, 25 Jan 2022 18:10:57 +0530
Subject: [PATCH 27/30] refactor: rename ReplicaSemiSync to IsReplicaSemiSync

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 go/vt/orchestrator/inst/analysis_dao.go          |  4 ++--
 go/vt/orchestrator/inst/durability.go            |  6 +++---
 go/vt/orchestrator/inst/instance_topology_dao.go |  2 +-
 go/vt/orchestrator/inst/tablet_dao.go            |  2 +-
 go/vt/vtctl/grpcvtctldserver/server.go           |  8 ++++----
 go/vt/vtctl/reparentutil/durability.go           | 16 ++++++++--------
 go/vt/vtctl/reparentutil/durability_test.go      | 12 ++++++------
 go/vt/vtctl/reparentutil/emergency_reparenter.go |  2 +-
 go/vt/vtctl/reparentutil/planned_reparenter.go   |  4 ++--
 go/vt/wrangler/tablet.go                         |  2 +-
 10 files changed, 29 insertions(+), 29 deletions(-)

diff --git a/go/vt/orchestrator/inst/analysis_dao.go b/go/vt/orchestrator/inst/analysis_dao.go
index 99d2c5a96fa..10c6b4a121c 100644
--- a/go/vt/orchestrator/inst/analysis_dao.go
+++ b/go/vt/orchestrator/inst/analysis_dao.go
@@ -532,11 +532,11 @@ func GetReplicationAnalysis(clusterName string, hints *ReplicationAnalysisHints)
 			a.Analysis = ReplicationStopped
 			a.Description = "Replication is stopped"
 			//
-		} else if topo.IsReplicaType(a.TabletType) && !a.IsPrimary && reparentutil.ReplicaSemiSync(primaryTablet, tablet) && !a.SemiSyncReplicaEnabled {
+		} else if topo.IsReplicaType(a.TabletType) && !a.IsPrimary && reparentutil.IsReplicaSemiSync(primaryTablet, tablet) && !a.SemiSyncReplicaEnabled {
 			a.Analysis = ReplicaSemiSyncMustBeSet
 			a.Description = "Replica semi-sync must be set"
 			//
-		} else if topo.IsReplicaType(a.TabletType) && !a.IsPrimary && !reparentutil.ReplicaSemiSync(primaryTablet, tablet) && a.SemiSyncReplicaEnabled {
+		} else if topo.IsReplicaType(a.TabletType) && !a.IsPrimary && !reparentutil.IsReplicaSemiSync(primaryTablet, tablet) && a.SemiSyncReplicaEnabled {
 			a.Analysis = ReplicaSemiSyncMustNotBeSet
 			a.Description = "Replica semi-sync must not be set"
 			//
diff --git a/go/vt/orchestrator/inst/durability.go b/go/vt/orchestrator/inst/durability.go
index 547ae03916f..c9cb199f1a8 100644
--- a/go/vt/orchestrator/inst/durability.go
+++ b/go/vt/orchestrator/inst/durability.go
@@ -20,8 +20,8 @@ import (
 	"vitess.io/vitess/go/vt/vtctl/reparentutil"
 )
 
-// ReplicaSemiSync returns the replica semi-sync setting for the instance.
-func ReplicaSemiSync(primaryKey, replicaKey InstanceKey) bool {
+// IsReplicaSemiSync returns the replica semi-sync setting for the instance.
+func IsReplicaSemiSync(primaryKey, replicaKey InstanceKey) bool {
 	primary, err := ReadTablet(primaryKey)
 	if err != nil {
 		return false
@@ -30,7 +30,7 @@ func ReplicaSemiSync(primaryKey, replicaKey InstanceKey) bool {
 	if err != nil {
 		return false
 	}
-	return reparentutil.ReplicaSemiSync(primary, replica)
+	return reparentutil.IsReplicaSemiSync(primary, replica)
 }
 
 // SemiSyncAckers returns the primary semi-sync setting for the instance.
diff --git a/go/vt/orchestrator/inst/instance_topology_dao.go b/go/vt/orchestrator/inst/instance_topology_dao.go
index ba584674892..b40aa831c9e 100644
--- a/go/vt/orchestrator/inst/instance_topology_dao.go
+++ b/go/vt/orchestrator/inst/instance_topology_dao.go
@@ -675,7 +675,7 @@ func ChangePrimaryTo(instanceKey *InstanceKey, primaryKey *InstanceKey, primaryB
 		return instance, log.Errore(err)
 	}
 
-	semiSync := ReplicaSemiSync(*primaryKey, *instanceKey)
+	semiSync := IsReplicaSemiSync(*primaryKey, *instanceKey)
 	if _, err := ExecInstance(instanceKey, `set global rpl_semi_sync_master_enabled = ?, global rpl_semi_sync_slave_enabled = ?`, false, semiSync); err != nil {
 		return instance, log.Errore(err)
 	}
diff --git a/go/vt/orchestrator/inst/tablet_dao.go b/go/vt/orchestrator/inst/tablet_dao.go
index 51b1f2fdc17..21309109d0d 100644
--- a/go/vt/orchestrator/inst/tablet_dao.go
+++ b/go/vt/orchestrator/inst/tablet_dao.go
@@ -80,7 +80,7 @@ func SwitchPrimary(newPrimaryKey, oldPrimaryKey InstanceKey) error {
 		log.Errore(err)
 		return nil
 	}
-	if _, err := ChangeTabletType(oldPrimaryKey, topodatapb.TabletType_REPLICA, ReplicaSemiSync(newPrimaryKey, oldPrimaryKey)); err != nil {
+	if _, err := ChangeTabletType(oldPrimaryKey, topodatapb.TabletType_REPLICA, IsReplicaSemiSync(newPrimaryKey, oldPrimaryKey)); err != nil {
 		// This is best effort.
 		log.Errore(err)
 	}
diff --git a/go/vt/vtctl/grpcvtctldserver/server.go b/go/vt/vtctl/grpcvtctldserver/server.go
index d69e99ecbfe..18e00c0ffa3 100644
--- a/go/vt/vtctl/grpcvtctldserver/server.go
+++ b/go/vt/vtctl/grpcvtctldserver/server.go
@@ -286,7 +286,7 @@ func (s *VtctldServer) ChangeTabletType(ctx context.Context, req *vtctldatapb.Ch
 	// Since we want to check the durability rules for the desired state and not before we make that change
 	expectedTablet := proto.Clone(tablet.Tablet).(*topodatapb.Tablet)
 	expectedTablet.Type = req.DbType
-	err = s.tmc.ChangeType(ctx, tablet.Tablet, req.DbType, reparentutil.ReplicaSemiSync(shardPrimary.Tablet, expectedTablet))
+	err = s.tmc.ChangeType(ctx, tablet.Tablet, req.DbType, reparentutil.IsReplicaSemiSync(shardPrimary.Tablet, expectedTablet))
 	if err != nil {
 		return nil, err
 	}
@@ -1530,7 +1530,7 @@ func (s *VtctldServer) InitShardPrimaryLocked(
 			go func(alias string, tabletInfo *topo.TabletInfo) {
 				defer wgReplicas.Done()
 				logger.Infof("initializing replica %v", alias)
-				if err := tmc.InitReplica(replCtx, tabletInfo.Tablet, req.PrimaryElectTabletAlias, rp, now, reparentutil.ReplicaSemiSync(primaryElectTabletInfo.Tablet, tabletInfo.Tablet)); err != nil {
+				if err := tmc.InitReplica(replCtx, tabletInfo.Tablet, req.PrimaryElectTabletAlias, rp, now, reparentutil.IsReplicaSemiSync(primaryElectTabletInfo.Tablet, tabletInfo.Tablet)); err != nil {
 					rec.RecordError(fmt.Errorf("tablet %v InitReplica failed: %v", alias, err))
 				}
 			}(alias, tabletInfo)
@@ -1949,7 +1949,7 @@ func (s *VtctldServer) ReparentTablet(ctx context.Context, req *vtctldatapb.Repa
 		return nil, vterrors.Errorf(vtrpc.Code_FAILED_PRECONDITION, "cannot ReparentTablet current shard primary (%v) onto itself", topoproto.TabletAliasString(req.Tablet))
 	}
 
-	if err := s.tmc.SetReplicationSource(ctx, tablet.Tablet, shard.PrimaryAlias, 0, "", false, reparentutil.ReplicaSemiSync(shardPrimary.Tablet, tablet.Tablet)); err != nil {
+	if err := s.tmc.SetReplicationSource(ctx, tablet.Tablet, shard.PrimaryAlias, 0, "", false, reparentutil.IsReplicaSemiSync(shardPrimary.Tablet, tablet.Tablet)); err != nil {
 		return nil, err
 	}
 
@@ -2388,7 +2388,7 @@ func (s *VtctldServer) StartReplication(ctx context.Context, req *vtctldatapb.St
 		return nil, vterrors.Errorf(vtrpc.Code_FAILED_PRECONDITION, "primary %v and replica %v not in same keypace shard (%v/%v)", topoproto.TabletAliasString(shard.PrimaryAlias), topoproto.TabletAliasString(tablet.Alias), tablet.Keyspace, tablet.Shard)
 	}
 
-	if err := s.tmc.StartReplication(ctx, tablet.Tablet, reparentutil.ReplicaSemiSync(shardPrimary.Tablet, tablet.Tablet)); err != nil {
+	if err := s.tmc.StartReplication(ctx, tablet.Tablet, reparentutil.IsReplicaSemiSync(shardPrimary.Tablet, tablet.Tablet)); err != nil {
 		log.Errorf("StartReplication: failed to start replication on %v: %v", alias, err)
 		return nil, err
 	}
diff --git a/go/vt/vtctl/reparentutil/durability.go b/go/vt/vtctl/reparentutil/durability.go
index 8b80cc5cf9f..320df553c47 100644
--- a/go/vt/vtctl/reparentutil/durability.go
+++ b/go/vt/vtctl/reparentutil/durability.go
@@ -61,7 +61,7 @@ func init() {
 type durabler interface {
 	promotionRule(*topodatapb.Tablet) promotionrule.CandidatePromotionRule
 	semiSyncAckers(*topodatapb.Tablet) int
-	replicaSemiSync(primary, replica *topodatapb.Tablet) bool
+	isReplicaSemiSync(primary, replica *topodatapb.Tablet) bool
 }
 
 func registerDurability(name string, newDurablerFunc newDurabler) {
@@ -101,12 +101,12 @@ func SemiSyncAckers(tablet *topodatapb.Tablet) int {
 	return curDurabilityPolicy.semiSyncAckers(tablet)
 }
 
-// ReplicaSemiSync returns the replica semi-sync setting from the tablet record.
+// IsReplicaSemiSync returns the replica semi-sync setting from the tablet record.
 // Prefer using this function if tablet record is available.
-func ReplicaSemiSync(primary, replica *topodatapb.Tablet) bool {
+func IsReplicaSemiSync(primary, replica *topodatapb.Tablet) bool {
 	curDurabilityPolicyMutex.Lock()
 	defer curDurabilityPolicyMutex.Unlock()
-	return curDurabilityPolicy.replicaSemiSync(primary, replica)
+	return curDurabilityPolicy.isReplicaSemiSync(primary, replica)
 }
 
 //=======================================================================
@@ -126,7 +126,7 @@ func (d *durabilityNone) semiSyncAckers(tablet *topodatapb.Tablet) int {
 	return 0
 }
 
-func (d *durabilityNone) replicaSemiSync(primary, replica *topodatapb.Tablet) bool {
+func (d *durabilityNone) isReplicaSemiSync(primary, replica *topodatapb.Tablet) bool {
 	return false
 }
 
@@ -148,7 +148,7 @@ func (d *durabilitySemiSync) semiSyncAckers(tablet *topodatapb.Tablet) int {
 	return 1
 }
 
-func (d *durabilitySemiSync) replicaSemiSync(primary, replica *topodatapb.Tablet) bool {
+func (d *durabilitySemiSync) isReplicaSemiSync(primary, replica *topodatapb.Tablet) bool {
 	switch replica.Type {
 	case topodatapb.TabletType_PRIMARY, topodatapb.TabletType_REPLICA:
 		return true
@@ -175,7 +175,7 @@ func (d *durabilityCrossCell) semiSyncAckers(tablet *topodatapb.Tablet) int {
 	return 1
 }
 
-func (d *durabilityCrossCell) replicaSemiSync(primary, replica *topodatapb.Tablet) bool {
+func (d *durabilityCrossCell) isReplicaSemiSync(primary, replica *topodatapb.Tablet) bool {
 	// Prevent panics.
 	if primary.Alias == nil || replica.Alias == nil {
 		return false
@@ -212,7 +212,7 @@ func (d *durabilitySpecified) semiSyncAckers(tablet *topodatapb.Tablet) int {
 	return 0
 }
 
-func (d *durabilitySpecified) replicaSemiSync(primary, replica *topodatapb.Tablet) bool {
+func (d *durabilitySpecified) isReplicaSemiSync(primary, replica *topodatapb.Tablet) bool {
 	return false
 }
 
diff --git a/go/vt/vtctl/reparentutil/durability_test.go b/go/vt/vtctl/reparentutil/durability_test.go
index f862b7b6cbe..45c352da2eb 100644
--- a/go/vt/vtctl/reparentutil/durability_test.go
+++ b/go/vt/vtctl/reparentutil/durability_test.go
@@ -52,7 +52,7 @@ func TestDurabilityNone(t *testing.T) {
 	})
 	assert.Equal(t, promotionrule.MustNot, promoteRule)
 	assert.Equal(t, 0, SemiSyncAckers(nil))
-	assert.Equal(t, false, ReplicaSemiSync(nil, nil))
+	assert.Equal(t, false, IsReplicaSemiSync(nil, nil))
 }
 
 func TestDurabilitySemiSync(t *testing.T) {
@@ -79,10 +79,10 @@ func TestDurabilitySemiSync(t *testing.T) {
 	})
 	assert.Equal(t, promotionrule.MustNot, promoteRule)
 	assert.Equal(t, 1, SemiSyncAckers(nil))
-	assert.Equal(t, true, ReplicaSemiSync(nil, &topodatapb.Tablet{
+	assert.Equal(t, true, IsReplicaSemiSync(nil, &topodatapb.Tablet{
 		Type: topodatapb.TabletType_REPLICA,
 	}))
-	assert.Equal(t, false, ReplicaSemiSync(nil, &topodatapb.Tablet{
+	assert.Equal(t, false, IsReplicaSemiSync(nil, &topodatapb.Tablet{
 		Type: topodatapb.TabletType_EXPERIMENTAL,
 	}))
 }
@@ -111,7 +111,7 @@ func TestDurabilityCrossCell(t *testing.T) {
 	})
 	assert.Equal(t, promotionrule.MustNot, promoteRule)
 	assert.Equal(t, 1, SemiSyncAckers(nil))
-	assert.Equal(t, false, ReplicaSemiSync(&topodatapb.Tablet{
+	assert.Equal(t, false, IsReplicaSemiSync(&topodatapb.Tablet{
 		Type: topodatapb.TabletType_PRIMARY,
 		Alias: &topodatapb.TabletAlias{
 			Cell: "cell1",
@@ -122,7 +122,7 @@ func TestDurabilityCrossCell(t *testing.T) {
 			Cell: "cell1",
 		},
 	}))
-	assert.Equal(t, true, ReplicaSemiSync(&topodatapb.Tablet{
+	assert.Equal(t, true, IsReplicaSemiSync(&topodatapb.Tablet{
 		Type: topodatapb.TabletType_PRIMARY,
 		Alias: &topodatapb.TabletAlias{
 			Cell: "cell1",
@@ -133,7 +133,7 @@ func TestDurabilityCrossCell(t *testing.T) {
 			Cell: "cell2",
 		},
 	}))
-	assert.Equal(t, false, ReplicaSemiSync(&topodatapb.Tablet{
+	assert.Equal(t, false, IsReplicaSemiSync(&topodatapb.Tablet{
 		Type: topodatapb.TabletType_PRIMARY,
 		Alias: &topodatapb.TabletAlias{
 			Cell: "cell1",
diff --git a/go/vt/vtctl/reparentutil/emergency_reparenter.go b/go/vt/vtctl/reparentutil/emergency_reparenter.go
index 877c3f58d6e..356e303a806 100644
--- a/go/vt/vtctl/reparentutil/emergency_reparenter.go
+++ b/go/vt/vtctl/reparentutil/emergency_reparenter.go
@@ -499,7 +499,7 @@ func (erp *EmergencyReparenter) reparentReplicas(
 			forceStart = fs
 		}
 
-		err := erp.tmc.SetReplicationSource(replCtx, ti.Tablet, newPrimaryTablet.Alias, 0, "", forceStart, ReplicaSemiSync(newPrimaryTablet, ti.Tablet))
+		err := erp.tmc.SetReplicationSource(replCtx, ti.Tablet, newPrimaryTablet.Alias, 0, "", forceStart, IsReplicaSemiSync(newPrimaryTablet, ti.Tablet))
 		if err != nil {
 			err = vterrors.Wrapf(err, "tablet %v SetReplicationSource failed: %v", alias, err)
 			rec.RecordError(err)
diff --git a/go/vt/vtctl/reparentutil/planned_reparenter.go b/go/vt/vtctl/reparentutil/planned_reparenter.go
index 94b5c049330..3b1dabeb05c 100644
--- a/go/vt/vtctl/reparentutil/planned_reparenter.go
+++ b/go/vt/vtctl/reparentutil/planned_reparenter.go
@@ -227,7 +227,7 @@ func (pr *PlannedReparenter) performGracefulPromotion(
 	setSourceCtx, setSourceCancel := context.WithTimeout(ctx, opts.WaitReplicasTimeout)
 	defer setSourceCancel()
 
-	if err := pr.tmc.SetReplicationSource(setSourceCtx, primaryElect, currentPrimary.Alias, 0, snapshotPos, true, ReplicaSemiSync(currentPrimary.Tablet, primaryElect)); err != nil {
+	if err := pr.tmc.SetReplicationSource(setSourceCtx, primaryElect, currentPrimary.Alias, 0, snapshotPos, true, IsReplicaSemiSync(currentPrimary.Tablet, primaryElect)); err != nil {
 		return "", vterrors.Wrapf(err, "replication on primary-elect %v did not catch up in time; replication must be healthy to perform PlannedReparent", primaryElectAliasStr)
 	}
 
@@ -652,7 +652,7 @@ func (pr *PlannedReparenter) reparentTablets(
 			// that it needs to start replication after transitioning from
 			// PRIMARY => REPLICA.
 			forceStartReplication := false
-			if err := pr.tmc.SetReplicationSource(replCtx, tablet, ev.NewPrimary.Alias, reparentJournalTimestamp, "", forceStartReplication, ReplicaSemiSync(ev.NewPrimary, tablet)); err != nil {
+			if err := pr.tmc.SetReplicationSource(replCtx, tablet, ev.NewPrimary.Alias, reparentJournalTimestamp, "", forceStartReplication, IsReplicaSemiSync(ev.NewPrimary, tablet)); err != nil {
 				rec.RecordError(vterrors.Wrapf(err, "tablet %v failed to SetReplicationSource(%v): %v", alias, primaryElectAliasStr, err))
 			}
 		}(alias, tabletInfo.Tablet)
diff --git a/go/vt/wrangler/tablet.go b/go/vt/wrangler/tablet.go
index dbac6e37181..af2250d0024 100644
--- a/go/vt/wrangler/tablet.go
+++ b/go/vt/wrangler/tablet.go
@@ -220,7 +220,7 @@ func (wr *Wrangler) shouldSendSemiSyncAck(ctx context.Context, tablet *topodatap
 		return false, vterrors.Errorf(vtrpc.Code_FAILED_PRECONDITION, "primary %v and potential replica %v not in same keypace shard (%v/%v)", topoproto.TabletAliasString(shard.PrimaryAlias), topoproto.TabletAliasString(tablet.Alias), tablet.Keyspace, tablet.Shard)
 	}
 
-	return reparentutil.ReplicaSemiSync(shardPrimary.Tablet, tablet), nil
+	return reparentutil.IsReplicaSemiSync(shardPrimary.Tablet, tablet), nil
 }
 
 // RefreshTabletState refreshes tablet state

From a5d5e17b16f9b35d321435f150f2284b7983962a Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Tue, 25 Jan 2022 18:46:51 +0530
Subject: [PATCH 28/30] refactor: rename SemiSyncActions values

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 go/vt/vttablet/tabletmanager/rpc_actions.go          |  8 ++++----
 go/vt/vttablet/tabletmanager/rpc_backup.go           |  2 +-
 go/vt/vttablet/tabletmanager/rpc_replication.go      | 10 +++++-----
 go/vt/vttablet/tabletmanager/rpc_replication_test.go | 12 ++++++------
 4 files changed, 16 insertions(+), 16 deletions(-)

diff --git a/go/vt/vttablet/tabletmanager/rpc_actions.go b/go/vt/vttablet/tabletmanager/rpc_actions.go
index 2a19256f817..3ffa5f2a37e 100644
--- a/go/vt/vttablet/tabletmanager/rpc_actions.go
+++ b/go/vt/vttablet/tabletmanager/rpc_actions.go
@@ -50,8 +50,8 @@ type SemiSyncAction int
 // Allowed values for SemiSyncAction
 const (
 	SemiSyncActionNone = SemiSyncAction(iota)
-	SemiSyncActionTrue
-	SemiSyncActionFalse
+	SemiSyncActionSet
+	SemiSyncActionUnset
 )
 
 // This file contains the implementations of RPCTM methods.
@@ -152,7 +152,7 @@ func (tm *TabletManager) IgnoreHealthError(ctx context.Context, pattern string)
 
 func convertBoolToSemiSyncAction(semiSync bool) SemiSyncAction {
 	if semiSync {
-		return SemiSyncActionTrue
+		return SemiSyncActionSet
 	}
-	return SemiSyncActionFalse
+	return SemiSyncActionUnset
 }
diff --git a/go/vt/vttablet/tabletmanager/rpc_backup.go b/go/vt/vttablet/tabletmanager/rpc_backup.go
index 47474931ac6..30c7cf867f2 100644
--- a/go/vt/vttablet/tabletmanager/rpc_backup.go
+++ b/go/vt/vttablet/tabletmanager/rpc_backup.go
@@ -85,7 +85,7 @@ func (tm *TabletManager) Backup(ctx context.Context, concurrency int, logger log
 		}
 		originalType = tablet.Type
 		// update our type to BACKUP
-		if err := tm.changeTypeLocked(ctx, topodatapb.TabletType_BACKUP, DBActionNone, SemiSyncActionFalse); err != nil {
+		if err := tm.changeTypeLocked(ctx, topodatapb.TabletType_BACKUP, DBActionNone, SemiSyncActionUnset); err != nil {
 			return err
 		}
 		// Tell Orchestrator we're stopped on purpose for some Vitess task.
diff --git a/go/vt/vttablet/tabletmanager/rpc_replication.go b/go/vt/vttablet/tabletmanager/rpc_replication.go
index fd4dbfd88e3..d3a8401e5ed 100644
--- a/go/vt/vttablet/tabletmanager/rpc_replication.go
+++ b/go/vt/vttablet/tabletmanager/rpc_replication.go
@@ -477,13 +477,13 @@ func (tm *TabletManager) demotePrimary(ctx context.Context, revertPartialFailure
 
 	if tm.isPrimarySideSemiSyncEnabled() {
 		// If using semi-sync, we need to disable primary-side.
-		if err := tm.fixSemiSync(topodatapb.TabletType_REPLICA, SemiSyncActionTrue); err != nil {
+		if err := tm.fixSemiSync(topodatapb.TabletType_REPLICA, SemiSyncActionSet); err != nil {
 			return nil, err
 		}
 		defer func() {
 			if finalErr != nil && revertPartialFailure && wasPrimary {
 				// enable primary-side semi-sync again
-				if err := tm.fixSemiSync(topodatapb.TabletType_PRIMARY, SemiSyncActionTrue); err != nil {
+				if err := tm.fixSemiSync(topodatapb.TabletType_PRIMARY, SemiSyncActionSet); err != nil {
 					log.Warningf("fixSemiSync(PRIMARY) failed during revert: %v", err)
 				}
 			}
@@ -887,7 +887,7 @@ func isPrimaryEligible(tabletType topodatapb.TabletType) bool {
 func (tm *TabletManager) fixSemiSync(tabletType topodatapb.TabletType, semiSync SemiSyncAction) error {
 	if !*enableSemiSync {
 		// Semi-sync handling is not enabled.
-		if semiSync == SemiSyncActionTrue {
+		if semiSync == SemiSyncActionSet {
 			log.Error("invalid configuration - semi-sync should be setup according to durability policies, but enable_semi_sync is not set")
 		}
 		return nil
@@ -896,13 +896,13 @@ func (tm *TabletManager) fixSemiSync(tabletType topodatapb.TabletType, semiSync
 	// Only enable if we're eligible for becoming primary (REPLICA type).
 	// Ineligible tablets (RDONLY) shouldn't ACK because we'll never promote them.
 	if !isPrimaryEligible(tabletType) {
-		if semiSync == SemiSyncActionTrue {
+		if semiSync == SemiSyncActionSet {
 			log.Error("invalid configuration - semi-sync should be setup according to durability policies, but the tablet is not primaryEligible")
 		}
 		return tm.MysqlDaemon.SetSemiSyncEnabled(false, false)
 	}
 
-	if semiSync == SemiSyncActionFalse {
+	if semiSync == SemiSyncActionUnset {
 		log.Error("invalid configuration - enabling semi sync even though not specified by durability policies. Possibly in the process of upgrading.")
 	}
 	// Always enable replica-side since it doesn't hurt to keep it on for a primary.
diff --git a/go/vt/vttablet/tabletmanager/rpc_replication_test.go b/go/vt/vttablet/tabletmanager/rpc_replication_test.go
index b9608bc7ed2..9b5ff03959c 100644
--- a/go/vt/vttablet/tabletmanager/rpc_replication_test.go
+++ b/go/vt/vttablet/tabletmanager/rpc_replication_test.go
@@ -80,13 +80,13 @@ func TestTabletManager_fixSemiSync(t *testing.T) {
 		{
 			name:                 "enableSemiSync=true(primary eligible),durabilitySemiSync=true",
 			tabletType:           topodata.TabletType_REPLICA,
-			semiSync:             SemiSyncActionTrue,
+			semiSync:             SemiSyncActionSet,
 			logOutput:            "",
 			shouldEnableSemiSync: true,
 		}, {
 			name:                 "enableSemiSync=true(primary eligible),durabilitySemiSync=false",
 			tabletType:           topodata.TabletType_REPLICA,
-			semiSync:             SemiSyncActionFalse,
+			semiSync:             SemiSyncActionUnset,
 			logOutput:            "invalid configuration - enabling semi sync even though not specified by durability policies.",
 			shouldEnableSemiSync: true,
 		}, {
@@ -98,13 +98,13 @@ func TestTabletManager_fixSemiSync(t *testing.T) {
 		}, {
 			name:                 "enableSemiSync=true(primary not-eligible),durabilitySemiSync=true",
 			tabletType:           topodata.TabletType_DRAINED,
-			semiSync:             SemiSyncActionTrue,
+			semiSync:             SemiSyncActionSet,
 			logOutput:            "invalid configuration - semi-sync should be setup according to durability policies, but the tablet is not primaryEligible",
 			shouldEnableSemiSync: true,
 		}, {
 			name:                 "enableSemiSync=true(primary not-eligible),durabilitySemiSync=false",
 			tabletType:           topodata.TabletType_DRAINED,
-			semiSync:             SemiSyncActionFalse,
+			semiSync:             SemiSyncActionUnset,
 			logOutput:            "",
 			shouldEnableSemiSync: true,
 		}, {
@@ -116,13 +116,13 @@ func TestTabletManager_fixSemiSync(t *testing.T) {
 		}, {
 			name:                 "enableSemiSync=false,durabilitySemiSync=true",
 			tabletType:           topodata.TabletType_REPLICA,
-			semiSync:             SemiSyncActionTrue,
+			semiSync:             SemiSyncActionSet,
 			logOutput:            "invalid configuration - semi-sync should be setup according to durability policies, but enable_semi_sync is not set",
 			shouldEnableSemiSync: false,
 		}, {
 			name:                 "enableSemiSync=false,durabilitySemiSync=false",
 			tabletType:           topodata.TabletType_REPLICA,
-			semiSync:             SemiSyncActionFalse,
+			semiSync:             SemiSyncActionUnset,
 			logOutput:            "",
 			shouldEnableSemiSync: false,
 		}, {

From 411a983e5facbe8d6d5b85ada863693c47762561 Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Tue, 25 Jan 2022 18:18:40 +0530
Subject: [PATCH 29/30] refactor: rename durability_policy flag

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 go/cmd/vtctl/vtctl.go                                     | 8 ++++----
 go/cmd/vtworker/vtworker.go                               | 4 ++--
 .../endtoend/backup/transform/backup_transform_utils.go   | 2 +-
 go/test/endtoend/backup/vtbackup/main_test.go             | 2 +-
 go/test/endtoend/backup/vtctlbackup/backup_utils.go       | 2 +-
 go/test/endtoend/recovery/pitr/shardedpitr_test.go        | 2 +-
 go/test/endtoend/recovery/pitrtls/shardedpitr_tls_test.go | 2 +-
 .../recovery/shardedrecovery/sharded_recovery_test.go     | 2 +-
 go/test/endtoend/recovery/unshardedrecovery/recovery.go   | 2 +-
 go/test/endtoend/reparent/newfeaturetest/reparent_test.go | 4 ++--
 go/test/endtoend/reparent/utils/utils.go                  | 4 ++--
 .../endtoend/sharding/initialsharding/sharding_util.go    | 2 +-
 .../endtoend/sharding/mergesharding/mergesharding_base.go | 2 +-
 go/test/endtoend/sharding/resharding/resharding_base.go   | 2 +-
 go/test/endtoend/vault/vault_test.go                      | 2 +-
 go/vt/vtctld/vtctld.go                                    | 4 ++--
 16 files changed, 23 insertions(+), 23 deletions(-)

diff --git a/go/cmd/vtctl/vtctl.go b/go/cmd/vtctl/vtctl.go
index 9f6d7136d0b..23e3f034882 100644
--- a/go/cmd/vtctl/vtctl.go
+++ b/go/cmd/vtctl/vtctl.go
@@ -45,9 +45,9 @@ import (
 )
 
 var (
-	waitTime     = flag.Duration("wait-time", 24*time.Hour, "time to wait on an action")
-	detachedMode = flag.Bool("detach", false, "detached mode - run vtcl detached from the terminal")
-	durability   = flag.String("durability", "none", "type of durability to enforce. Default is none. Other values are dictated by registered plugins")
+	waitTime         = flag.Duration("wait-time", 24*time.Hour, "time to wait on an action")
+	detachedMode     = flag.Bool("detach", false, "detached mode - run vtcl detached from the terminal")
+	durabilityPolicy = flag.String("durability_policy", "none", "type of durability to enforce. Default is none. Other values are dictated by registered plugins")
 )
 
 func init() {
@@ -93,7 +93,7 @@ func main() {
 		log.Warningf("cannot connect to syslog: %v", err)
 	}
 
-	if err := reparentutil.SetDurabilityPolicy(*durability, nil); err != nil {
+	if err := reparentutil.SetDurabilityPolicy(*durabilityPolicy, nil); err != nil {
 		log.Errorf("error in setting durability policy: %v", err)
 		exit.Return(1)
 	}
diff --git a/go/cmd/vtworker/vtworker.go b/go/cmd/vtworker/vtworker.go
index 6f8a30bc73c..301617d1579 100644
--- a/go/cmd/vtworker/vtworker.go
+++ b/go/cmd/vtworker/vtworker.go
@@ -45,7 +45,7 @@ var (
 	cell                   = flag.String("cell", "", "cell to pick servers from")
 	commandDisplayInterval = flag.Duration("command_display_interval", time.Second, "Interval between each status update when vtworker is executing a single command from the command line")
 	username               = flag.String("username", "", "If set, value is set as immediate caller id in the request and used by vttablet for TableACL check")
-	durability             = flag.String("durability", "none", "type of durability to enforce. Default is none. Other values are dictated by registered plugins")
+	durabilityPolicy       = flag.String("durability_policy", "none", "type of durability to enforce. Default is none. Other values are dictated by registered plugins")
 )
 
 func init() {
@@ -80,7 +80,7 @@ func main() {
 		os.Exit(0)
 	}
 
-	if err := reparentutil.SetDurabilityPolicy(*durability, nil); err != nil {
+	if err := reparentutil.SetDurabilityPolicy(*durabilityPolicy, nil); err != nil {
 		log.Errorf("error in setting durability policy: %v", err)
 		exit.Return(1)
 	}
diff --git a/go/test/endtoend/backup/transform/backup_transform_utils.go b/go/test/endtoend/backup/transform/backup_transform_utils.go
index bd5bab56474..1cc13160979 100644
--- a/go/test/endtoend/backup/transform/backup_transform_utils.go
+++ b/go/test/endtoend/backup/transform/backup_transform_utils.go
@@ -68,7 +68,7 @@ func TestMainSetup(m *testing.M, useMysqlctld bool) {
 		localCluster = cluster.NewCluster(cell, hostname)
 		defer localCluster.Teardown()
 
-		localCluster.VtctldExtraArgs = append(localCluster.VtctldExtraArgs, "-durability=semi_sync")
+		localCluster.VtctldExtraArgs = append(localCluster.VtctldExtraArgs, "-durability_policy=semi_sync")
 		// Start topo server
 		err := localCluster.StartTopo()
 		if err != nil {
diff --git a/go/test/endtoend/backup/vtbackup/main_test.go b/go/test/endtoend/backup/vtbackup/main_test.go
index 2617a579c03..c4d9edbafca 100644
--- a/go/test/endtoend/backup/vtbackup/main_test.go
+++ b/go/test/endtoend/backup/vtbackup/main_test.go
@@ -61,7 +61,7 @@ func TestMain(m *testing.M) {
 		localCluster = cluster.NewCluster(cell, hostname)
 		defer localCluster.Teardown()
 
-		localCluster.VtctldExtraArgs = append(localCluster.VtctldExtraArgs, "-durability=semi_sync")
+		localCluster.VtctldExtraArgs = append(localCluster.VtctldExtraArgs, "-durability_policy=semi_sync")
 		// Start topo server
 		err := localCluster.StartTopo()
 		if err != nil {
diff --git a/go/test/endtoend/backup/vtctlbackup/backup_utils.go b/go/test/endtoend/backup/vtctlbackup/backup_utils.go
index 97bd275fc7e..c23a7f9b2c6 100644
--- a/go/test/endtoend/backup/vtctlbackup/backup_utils.go
+++ b/go/test/endtoend/backup/vtctlbackup/backup_utils.go
@@ -83,7 +83,7 @@ var (
 // LaunchCluster : starts the cluster as per given params.
 func LaunchCluster(setupType int, streamMode string, stripes int) (int, error) {
 	localCluster = cluster.NewCluster(cell, hostname)
-	localCluster.VtctldExtraArgs = append(localCluster.VtctldExtraArgs, "-durability=semi_sync")
+	localCluster.VtctldExtraArgs = append(localCluster.VtctldExtraArgs, "-durability_policy=semi_sync")
 
 	// Start topo server
 	err := localCluster.StartTopo()
diff --git a/go/test/endtoend/recovery/pitr/shardedpitr_test.go b/go/test/endtoend/recovery/pitr/shardedpitr_test.go
index e665d84bf2b..a9dbbef2cd1 100644
--- a/go/test/endtoend/recovery/pitr/shardedpitr_test.go
+++ b/go/test/endtoend/recovery/pitr/shardedpitr_test.go
@@ -371,7 +371,7 @@ func removeTablets(t *testing.T, tablets []*cluster.Vttablet) {
 
 func initializeCluster(t *testing.T) {
 	clusterInstance = cluster.NewCluster(cell, hostname)
-	clusterInstance.VtctldExtraArgs = append(clusterInstance.VtctldExtraArgs, "-durability=semi_sync")
+	clusterInstance.VtctldExtraArgs = append(clusterInstance.VtctldExtraArgs, "-durability_policy=semi_sync")
 
 	// Start topo server
 	err := clusterInstance.StartTopo()
diff --git a/go/test/endtoend/recovery/pitrtls/shardedpitr_tls_test.go b/go/test/endtoend/recovery/pitrtls/shardedpitr_tls_test.go
index a07e1349956..604d65b1ebd 100644
--- a/go/test/endtoend/recovery/pitrtls/shardedpitr_tls_test.go
+++ b/go/test/endtoend/recovery/pitrtls/shardedpitr_tls_test.go
@@ -108,7 +108,7 @@ func removeTablets(t *testing.T, tablets []*cluster.Vttablet) {
 
 func initializeCluster(t *testing.T) {
 	clusterInstance = cluster.NewCluster(cell, hostname)
-	clusterInstance.VtctldExtraArgs = append(clusterInstance.VtctldExtraArgs, "-durability=semi_sync")
+	clusterInstance.VtctldExtraArgs = append(clusterInstance.VtctldExtraArgs, "-durability_policy=semi_sync")
 
 	// Start topo server
 	err := clusterInstance.StartTopo()
diff --git a/go/test/endtoend/recovery/shardedrecovery/sharded_recovery_test.go b/go/test/endtoend/recovery/shardedrecovery/sharded_recovery_test.go
index 824417cb6bc..7dd1565c954 100644
--- a/go/test/endtoend/recovery/shardedrecovery/sharded_recovery_test.go
+++ b/go/test/endtoend/recovery/shardedrecovery/sharded_recovery_test.go
@@ -466,7 +466,7 @@ func removeTablets(t *testing.T, tablets []*cluster.Vttablet) {
 func initializeCluster(t *testing.T) (int, error) {
 
 	localCluster = cluster.NewCluster(cell, hostname)
-	localCluster.VtctldExtraArgs = append(localCluster.VtctldExtraArgs, "-durability=semi_sync")
+	localCluster.VtctldExtraArgs = append(localCluster.VtctldExtraArgs, "-durability_policy=semi_sync")
 
 	// Start topo server
 	err := localCluster.StartTopo()
diff --git a/go/test/endtoend/recovery/unshardedrecovery/recovery.go b/go/test/endtoend/recovery/unshardedrecovery/recovery.go
index 0c0830bb0f5..ac6acb2c11e 100644
--- a/go/test/endtoend/recovery/unshardedrecovery/recovery.go
+++ b/go/test/endtoend/recovery/unshardedrecovery/recovery.go
@@ -82,7 +82,7 @@ func TestMainImpl(m *testing.M) {
 		localCluster = cluster.NewCluster(cell, hostname)
 		defer localCluster.Teardown()
 
-		localCluster.VtctldExtraArgs = append(localCluster.VtctldExtraArgs, "-durability=semi_sync")
+		localCluster.VtctldExtraArgs = append(localCluster.VtctldExtraArgs, "-durability_policy=semi_sync")
 		// Start topo server
 		err := localCluster.StartTopo()
 		if err != nil {
diff --git a/go/test/endtoend/reparent/newfeaturetest/reparent_test.go b/go/test/endtoend/reparent/newfeaturetest/reparent_test.go
index cbe60d06165..50c9fc79fd9 100644
--- a/go/test/endtoend/reparent/newfeaturetest/reparent_test.go
+++ b/go/test/endtoend/reparent/newfeaturetest/reparent_test.go
@@ -37,7 +37,7 @@ func TestPRSForInitialization(t *testing.T) {
 	var tablets []*cluster.Vttablet
 	clusterInstance := cluster.NewCluster("zone1", "localhost")
 	keyspace := &cluster.Keyspace{Name: utils.KeyspaceName}
-	clusterInstance.VtctldExtraArgs = append(clusterInstance.VtctldExtraArgs, "-durability=semi_sync")
+	clusterInstance.VtctldExtraArgs = append(clusterInstance.VtctldExtraArgs, "-durability_policy=semi_sync")
 	// Start topo server
 	err := clusterInstance.StartTopo()
 	require.NoError(t, err)
@@ -254,7 +254,7 @@ func TestERSForInitialization(t *testing.T) {
 	var tablets []*cluster.Vttablet
 	clusterInstance := cluster.NewCluster("zone1", "localhost")
 	keyspace := &cluster.Keyspace{Name: utils.KeyspaceName}
-	clusterInstance.VtctldExtraArgs = append(clusterInstance.VtctldExtraArgs, "-durability=semi_sync")
+	clusterInstance.VtctldExtraArgs = append(clusterInstance.VtctldExtraArgs, "-durability_policy=semi_sync")
 	// Start topo server
 	err := clusterInstance.StartTopo()
 	require.NoError(t, err)
diff --git a/go/test/endtoend/reparent/utils/utils.go b/go/test/endtoend/reparent/utils/utils.go
index 3b473e44343..011720c3d85 100644
--- a/go/test/endtoend/reparent/utils/utils.go
+++ b/go/test/endtoend/reparent/utils/utils.go
@@ -86,7 +86,7 @@ func setupCluster(ctx context.Context, t *testing.T, shardName string, cells []s
 	if enableSemiSync {
 		clusterInstance.VtTabletExtraArgs = append(clusterInstance.VtTabletExtraArgs, "-enable_semi_sync")
 		if clusterInstance.VtctlMajorVersion >= 13 {
-			clusterInstance.VtctldExtraArgs = append(clusterInstance.VtctldExtraArgs, "-durability=semi_sync")
+			clusterInstance.VtctldExtraArgs = append(clusterInstance.VtctldExtraArgs, "-durability_policy=semi_sync")
 		}
 	}
 
@@ -311,7 +311,7 @@ func ErsIgnoreTablet(clusterInstance *cluster.LocalProcessCluster, tab *cluster.
 func ErsWithVtctl(clusterInstance *cluster.LocalProcessCluster) (string, error) {
 	args := []string{"EmergencyReparentShard", "-keyspace_shard", fmt.Sprintf("%s/%s", KeyspaceName, ShardName)}
 	if clusterInstance.VtctlMajorVersion >= 13 {
-		args = append([]string{"-durability=semi_sync"}, args...)
+		args = append([]string{"-durability_policy=semi_sync"}, args...)
 	}
 	return clusterInstance.VtctlProcess.ExecuteCommandWithOutput(args...)
 }
diff --git a/go/test/endtoend/sharding/initialsharding/sharding_util.go b/go/test/endtoend/sharding/initialsharding/sharding_util.go
index feabfa2c008..708b02ba561 100644
--- a/go/test/endtoend/sharding/initialsharding/sharding_util.go
+++ b/go/test/endtoend/sharding/initialsharding/sharding_util.go
@@ -96,7 +96,7 @@ func ClusterWrapper(isMulti bool) (int, error) {
 	ClusterInstance = nil
 	ClusterInstance = cluster.NewCluster(cell, hostname)
 
-	ClusterInstance.VtctldExtraArgs = append(ClusterInstance.VtctldExtraArgs, "-durability=semi_sync")
+	ClusterInstance.VtctldExtraArgs = append(ClusterInstance.VtctldExtraArgs, "-durability_policy=semi_sync")
 	// Start topo server
 	if err := ClusterInstance.StartTopo(); err != nil {
 		return 1, err
diff --git a/go/test/endtoend/sharding/mergesharding/mergesharding_base.go b/go/test/endtoend/sharding/mergesharding/mergesharding_base.go
index 012f19b4b46..6501ea8c418 100644
--- a/go/test/endtoend/sharding/mergesharding/mergesharding_base.go
+++ b/go/test/endtoend/sharding/mergesharding/mergesharding_base.go
@@ -107,7 +107,7 @@ func TestMergesharding(t *testing.T, useVarbinaryShardingKeyType bool) {
 
 	// Launch keyspace
 	keyspace := &cluster.Keyspace{Name: keyspaceName}
-	clusterInstance.VtctldExtraArgs = append(clusterInstance.VtctldExtraArgs, "-durability=semi_sync")
+	clusterInstance.VtctldExtraArgs = append(clusterInstance.VtctldExtraArgs, "-durability_policy=semi_sync")
 
 	// Start topo server
 	err := clusterInstance.StartTopo()
diff --git a/go/test/endtoend/sharding/resharding/resharding_base.go b/go/test/endtoend/sharding/resharding/resharding_base.go
index d5e0066405f..a8d7d5f474c 100644
--- a/go/test/endtoend/sharding/resharding/resharding_base.go
+++ b/go/test/endtoend/sharding/resharding/resharding_base.go
@@ -190,7 +190,7 @@ func TestResharding(t *testing.T, useVarbinaryShardingKeyType bool) {
 
 	// Launch keyspace
 	keyspace := &cluster.Keyspace{Name: keyspaceName}
-	clusterInstance.VtctldExtraArgs = append(clusterInstance.VtctldExtraArgs, "-durability=semi_sync")
+	clusterInstance.VtctldExtraArgs = append(clusterInstance.VtctldExtraArgs, "-durability_policy=semi_sync")
 
 	// Start topo server
 	err := clusterInstance.StartTopo()
diff --git a/go/test/endtoend/vault/vault_test.go b/go/test/endtoend/vault/vault_test.go
index ecaea49938c..cb10c07e5b6 100644
--- a/go/test/endtoend/vault/vault_test.go
+++ b/go/test/endtoend/vault/vault_test.go
@@ -218,7 +218,7 @@ func setupVaultServer(t *testing.T, vs *VaultServer) (string, string) {
 func initializeClusterEarly(t *testing.T) {
 	clusterInstance = cluster.NewCluster(cell, hostname)
 
-	clusterInstance.VtctldExtraArgs = append(clusterInstance.VtctldExtraArgs, "-durability=semi_sync")
+	clusterInstance.VtctldExtraArgs = append(clusterInstance.VtctldExtraArgs, "-durability_policy=semi_sync")
 	// Start topo server
 	err := clusterInstance.StartTopo()
 	require.NoError(t, err)
diff --git a/go/vt/vtctld/vtctld.go b/go/vt/vtctld/vtctld.go
index b0259bc9c86..8f7a46b95e9 100644
--- a/go/vt/vtctld/vtctld.go
+++ b/go/vt/vtctld/vtctld.go
@@ -41,7 +41,7 @@ import (
 
 var (
 	enableRealtimeStats = flag.Bool("enable_realtime_stats", false, "Required for the Realtime Stats view. If set, vtctld will maintain a streaming RPC to each tablet (in all cells) to gather the realtime health stats.")
-	durability          = flag.String("durability", "none", "type of durability to enforce. Default is none. Other values are dictated by registered plugins")
+	durabilityPolicy    = flag.String("durability_policy", "none", "type of durability to enforce. Default is none. Other values are dictated by registered plugins")
 
 	_ = flag.String("web_dir", "", "NOT USED, here for backward compatibility")
 	_ = flag.String("web_dir2", "", "NOT USED, here for backward compatibility")
@@ -53,7 +53,7 @@ const (
 
 // InitVtctld initializes all the vtctld functionality.
 func InitVtctld(ts *topo.Server) error {
-	err := reparentutil.SetDurabilityPolicy(*durability, nil)
+	err := reparentutil.SetDurabilityPolicy(*durabilityPolicy, nil)
 	if err != nil {
 		log.Errorf("error in setting durability policy: %v", err)
 		return err

From 79d28222243b78c65a91ef8cc18ebcc44c01b086 Mon Sep 17 00:00:00 2001
From: Manan Gupta <manan@planetscale.com>
Date: Tue, 25 Jan 2022 18:31:41 +0530
Subject: [PATCH 30/30] refactor: add comment explaining the use of
 isPrimarySideSemiSyncEnabled

Signed-off-by: Manan Gupta <manan@planetscale.com>
---
 go/vt/vttablet/tabletmanager/rpc_replication.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/go/vt/vttablet/tabletmanager/rpc_replication.go b/go/vt/vttablet/tabletmanager/rpc_replication.go
index d3a8401e5ed..96ca76f09e6 100644
--- a/go/vt/vttablet/tabletmanager/rpc_replication.go
+++ b/go/vt/vttablet/tabletmanager/rpc_replication.go
@@ -475,6 +475,8 @@ func (tm *TabletManager) demotePrimary(ctx context.Context, revertPartialFailure
 		}
 	}()
 
+	// Here, we check if the primary side semi sync is enabled or not. If it isn't enabled then we do not need to take any action.
+	// If it is enabled then we should turn it off and revert in case of failure.
 	if tm.isPrimarySideSemiSyncEnabled() {
 		// If using semi-sync, we need to disable primary-side.
 		if err := tm.fixSemiSync(topodatapb.TabletType_REPLICA, SemiSyncActionSet); err != nil {