flashback: make br backup full works during flashback cluster

br/pkg/backup/BUILD.bazel

@@ -29,7 +29,6 @@ go_library(
         "//distsql",
         "//kv",
         "//meta",
-        "//meta/autoid",
         "//parser/model",
         "//statistics/handle",
         "//util",

br/pkg/backup/client.go

@@ -39,7 +39,6 @@ import (
 	"github.com/pingcap/tidb/distsql"
 	"github.com/pingcap/tidb/kv"
 	"github.com/pingcap/tidb/meta"
-	"github.com/pingcap/tidb/meta/autoid"
 	"github.com/pingcap/tidb/parser/model"
 	"github.com/pingcap/tidb/util"
 	"github.com/pingcap/tidb/util/codec"
@@ -561,24 +560,21 @@ func BuildBackupRangeAndSchema(
 				zap.String("table", tableInfo.Name.O),
 			)
 
-			tblVer := autoid.AllocOptionTableInfoVersion(tableInfo.Version)
-			idAlloc := autoid.NewAllocator(storage, dbInfo.ID, tableInfo.ID, false, autoid.RowIDAllocType, tblVer)
-			seqAlloc := autoid.NewAllocator(storage, dbInfo.ID, tableInfo.ID, false, autoid.SequenceType, tblVer)
-			randAlloc := autoid.NewAllocator(storage, dbInfo.ID, tableInfo.ID, false, autoid.AutoRandomType, tblVer)
+			autoIDAccess := m.GetAutoIDAccessors(dbInfo.ID, tableInfo.ID)
 
 			var globalAutoID int64
 			switch {
 			case tableInfo.IsSequence():
-				globalAutoID, err = seqAlloc.NextGlobalAutoID()
+				globalAutoID, err = autoIDAccess.SequenceCycle().Get()
 			case tableInfo.IsView() || !utils.NeedAutoID(tableInfo):
 				// no auto ID for views or table without either rowID nor auto_increment ID.
 			default:
-				globalAutoID, err = idAlloc.NextGlobalAutoID()
+				globalAutoID, err = autoIDAccess.RowID().Get()
 			}
 			if err != nil {
 				return nil, nil, nil, errors.Trace(err)
 			}
-			tableInfo.AutoIncID = globalAutoID
+			tableInfo.AutoIncID = globalAutoID + 1
 			if !isFullBackup {
 				// according to https://github.com/pingcap/tidb/issues/32290.
 				// ignore placement policy when not in full backup
@@ -591,11 +587,11 @@ func BuildBackupRangeAndSchema(
 			if tableInfo.PKIsHandle && tableInfo.ContainsAutoRandomBits() {
 				// this table has auto_random id, we need backup and rebase in restoration
 				var globalAutoRandID int64
-				globalAutoRandID, err = randAlloc.NextGlobalAutoID()
+				globalAutoRandID, err = autoIDAccess.RandomID().Get()
 				if err != nil {
 					return nil, nil, nil, errors.Trace(err)
 				}
-				tableInfo.AutoRandID = globalAutoRandID
+				tableInfo.AutoRandID = globalAutoRandID + 1
 				logger.Debug("change table AutoRandID",
 					zap.Int64("AutoRandID", globalAutoRandID))
 			}

ddl/cluster.go

@@ -623,8 +623,8 @@ func splitRegionsByKeyRanges(d *ddlCtx, keyRanges []kv.KeyRange) {
 
 // A Flashback has 4 different stages.
 // 1. before lock flashbackClusterJobID, check clusterJobID and lock it.
-// 2. before flashback start, check timestamp, disable GC and close PD schedule.
-// 3. phase 1, get key ranges, lock all regions.
+// 2. before flashback start, check timestamp, disable GC and close PD schedule, get flashback key ranges.
+// 3. phase 1, lock flashback key ranges.
 // 4. phase 2, send flashback RPC, do flashback jobs.
 func (w *worker) onFlashbackCluster(d *ddlCtx, t *meta.Meta, job *model.Job) (ver int64, err error) {
 	inFlashbackTest := false
@@ -692,7 +692,7 @@ func (w *worker) onFlashbackCluster(d *ddlCtx, t *meta.Meta, job *model.Job) (ve
 		job.Args[ttlJobEnableOffSet] = &ttlJobEnableValue
 		job.SchemaState = model.StateDeleteOnly
 		return ver, nil
-	// Stage 2, check flashbackTS, close GC and PD schedule.
+	// Stage 2, check flashbackTS, close GC and PD schedule, get flashback key ranges.
 	case model.StateDeleteOnly:
 		if err = checkAndSetFlashbackClusterInfo(sess, d, t, job, flashbackTS); err != nil {
 			job.State = model.JobStateCancelled
@@ -711,8 +711,8 @@ func (w *worker) onFlashbackCluster(d *ddlCtx, t *meta.Meta, job *model.Job) (ve
 		}
 		job.Args[keyRangesOffset] = keyRanges
 		job.SchemaState = model.StateWriteOnly
-		return ver, nil
-	// Stage 3, get key ranges and get locks.
+		return updateSchemaVersion(d, t, job)
+	// Stage 3, lock related key ranges.
 	case model.StateWriteOnly:
 		// TODO: Support flashback in unistore.
 		if inFlashbackTest {
@@ -742,7 +742,7 @@ func (w *worker) onFlashbackCluster(d *ddlCtx, t *meta.Meta, job *model.Job) (ve
 		}
 		job.Args[commitTSOffset] = commitTS
 		job.SchemaState = model.StateWriteReorganization
-		return updateSchemaVersion(d, t, job)
+		return ver, nil
 	// Stage 4, get key ranges and send flashback RPC.
 	case model.StateWriteReorganization:
 		// TODO: Support flashback in unistore.

ddl/cluster_test.go

@@ -136,7 +136,8 @@ func TestAddDDLDuringFlashback(t *testing.T) {
 	hook.OnJobRunBeforeExported = func(job *model.Job) {
 		assert.Equal(t, model.ActionFlashbackCluster, job.Type)
 		if job.SchemaState == model.StateWriteOnly {
-			_, err := tk.Exec("alter table t add column b int")
+			tk1 := testkit.NewTestKit(t, store)
+			_, err := tk1.Exec("alter table test.t add column b int")
 			assert.ErrorContains(t, err, "Can't add ddl job, have flashback cluster job")
 		}
 	}

domain/domain.go

@@ -471,6 +471,18 @@ func (do *Domain) GetScope(status string) variable.ScopeFlag {
 	return variable.DefaultStatusVarScopeFlag
 }
 
+func getFlashbackStartTSFromErrorMsg(err error) uint64 {
+	slices := strings.Split(err.Error(), "is in flashback progress, FlashbackStartTS is ")
+	if len(slices) != 2 {
+		return 0
+	}
+	version, err := strconv.ParseUint(slices[1], 10, 0)
+	if err != nil {
+		return 0
+	}
+	return version
+}
+
 // Reload reloads InfoSchema.
 // It's public in order to do the test.
 func (do *Domain) Reload() error {
@@ -490,7 +502,15 @@ func (do *Domain) Reload() error {
 		return err
 	}
 
-	is, hitCache, oldSchemaVersion, changes, err := do.loadInfoSchema(ver.Ver)
+	version := ver.Ver
+	is, hitCache, oldSchemaVersion, changes, err := do.loadInfoSchema(version)
+	if err != nil {
+		if version = getFlashbackStartTSFromErrorMsg(err); version != 0 {
+			// use the lastest available version to create domain
+			version -= 1
+			is, hitCache, oldSchemaVersion, changes, err = do.loadInfoSchema(version)
+		}
+	}
 	metrics.LoadSchemaDuration.Observe(time.Since(startTime).Seconds())
 	if err != nil {
 		metrics.LoadSchemaCounter.WithLabelValues("failed").Inc()
@@ -519,7 +539,7 @@ func (do *Domain) Reload() error {
 	}
 
 	// lease renew, so it must be executed despite it is cache or not
-	do.SchemaValidator.Update(ver.Ver, oldSchemaVersion, is.SchemaMetaVersion(), changes)
+	do.SchemaValidator.Update(version, oldSchemaVersion, is.SchemaMetaVersion(), changes)
 	lease := do.DDL().GetLease()
 	sub := time.Since(startTime)
 	// Reload interval is lease / 2, if load schema time elapses more than this interval,

domain/schema_validator.go

@@ -153,7 +153,9 @@ func (s *schemaValidator) Update(leaseGrantTS uint64, oldVer, currVer int64, cha
 				s.do.Store().GetMemCache().Delete(tblIDs[idx])
 			}
 			if ac == uint64(model.ActionFlashbackCluster) {
-				s.do.InfoSyncer().GetSessionManager().KillNonFlashbackClusterConn()
+				if s.do != nil && s.do.InfoSyncer() != nil && s.do.InfoSyncer().GetSessionManager() != nil {
+					s.do.InfoSyncer().GetSessionManager().KillNonFlashbackClusterConn()
+				}
 			}
 		}
 		logutil.BgLogger().Debug("update schema validator", zap.Int64("oldVer", oldVer),

tests/realtikvtest/flashbacktest/BUILD.bazel

@@ -9,13 +9,17 @@ go_test(
     flaky = True,
     race = "on",
     deps = [
+        "//ddl",
         "//ddl/util",
+        "//domain",
         "//errno",
+        "//meta",
         "//parser/model",
         "//testkit",
         "//testkit/testsetup",
         "//tests/realtikvtest",
         "@com_github_pingcap_failpoint//:failpoint",
+        "@com_github_stretchr_testify//assert",
         "@com_github_stretchr_testify//require",
         "@com_github_tikv_client_go_v2//oracle",
         "@com_github_tikv_client_go_v2//util",

tests/realtikvtest/flashbacktest/flashback_test.go

@@ -17,15 +17,20 @@ package flashbacktest
 import (
 	"context"
 	"fmt"
+	"strings"
 	"testing"
 	"time"
 
 	"github.com/pingcap/failpoint"
+	"github.com/pingcap/tidb/ddl"
 	ddlutil "github.com/pingcap/tidb/ddl/util"
+	"github.com/pingcap/tidb/domain"
 	"github.com/pingcap/tidb/errno"
+	"github.com/pingcap/tidb/meta"
 	"github.com/pingcap/tidb/parser/model"
 	"github.com/pingcap/tidb/testkit"
 	"github.com/pingcap/tidb/tests/realtikvtest"
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"github.com/tikv/client-go/v2/oracle"
 	tikvutil "github.com/tikv/client-go/v2/util"
@@ -524,3 +529,71 @@ func TestFlashbackTmpTable(t *testing.T) {
 		require.NoError(t, failpoint.Disable("github.com/pingcap/tidb/ddl/injectSafeTS"))
 	}
 }
+
+func TestFlashbackInProcessErrorMsg(t *testing.T) {
+	if *realtikvtest.WithRealTiKV {
+		store, dom := realtikvtest.CreateMockStoreAndDomainAndSetup(t)
+
+		originHook := dom.DDL().GetHook()
+
+		tk := testkit.NewTestKit(t, store)
+		timeBeforeDrop, _, safePointSQL, resetGC := MockGC(tk)
+		defer resetGC()
+
+		tk.MustExec(fmt.Sprintf(safePointSQL, timeBeforeDrop))
+		tk.MustExec("use test")
+		tk.MustExec("drop table if exists t")
+		tk.MustExec("create table t(a int)")
+
+		time.Sleep(1 * time.Second)
+		ts, err := tk.Session().GetStore().GetOracle().GetTimestamp(context.Background(), &oracle.Option{})
+		require.NoError(t, err)
+
+		// do some ddl and dml
+		tk.MustExec("alter table t add index k(a)")
+		tk.MustExec("insert into t values (1), (2), (3)")
+
+		injectSafeTS := oracle.GoTimeToTS(oracle.GetTimeFromTS(ts).Add(100 * time.Second))
+		require.NoError(t, failpoint.Enable("github.com/pingcap/tidb/ddl/injectSafeTS",
+			fmt.Sprintf("return(%v)", injectSafeTS)))
+
+		hook := newTestCallBack(t, dom)
+		hook.OnJobRunBeforeExported = func(job *model.Job) {
+			if job.Type == model.ActionFlashbackCluster && job.SchemaState == model.StateWriteReorganization {
+				txn, err := store.Begin()
+				assert.NoError(t, err)
+				_, err = meta.NewMeta(txn).ListDatabases()
+				errorMsg := err.Error()
+				assert.Contains(t, errorMsg, "is in flashback progress, FlashbackStartTS is ")
+				slices := strings.Split(errorMsg, "is in flashback progress, FlashbackStartTS is ")
+				assert.Equal(t, len(slices), 2)
+				assert.NotEqual(t, slices[1], "0")
+				txn.Rollback()
+			}
+		}
+		dom.DDL().SetHook(hook)
+		tk.Exec(fmt.Sprintf("flashback cluster to timestamp '%s'", oracle.GetTimeFromTS(ts)))
+		dom.DDL().SetHook(originHook)
+
+		require.NoError(t, failpoint.Disable("github.com/pingcap/tidb/ddl/injectSafeTS"))
+	}
+}
+
+type testCallback struct {
+	ddl.Callback
+	OnJobRunBeforeExported func(job *model.Job)
+}
+
+func newTestCallBack(t *testing.T, dom *domain.Domain) *testCallback {
+	defHookFactory, err := ddl.GetCustomizedHook("default_hook")
+	require.NoError(t, err)
+	return &testCallback{
+		Callback: defHookFactory(dom),
+	}
+}
+
+func (c *testCallback) OnJobRunBefore(job *model.Job) {
+	if c.OnJobRunBeforeExported != nil {
+		c.OnJobRunBeforeExported(job)
+	}
+}