From 51c21cff86bf9d557d56f5f09be833850be38a8b Mon Sep 17 00:00:00 2001
From: Ajeet D'Souza <98ajeet@gmail.com>
Date: Wed, 5 May 2021 15:25:28 +0530
Subject: [PATCH 1/5] Revert "Make backup API asynchronous"

This reverts commit 4418a7a3a414cb3db84fb9004eb9b7d32228fdc2.
---
 dgraph/cmd/alpha/admin_backup.go              |  4 +-
 graphql/admin/backup.go                       |  4 +-
 graphql/e2e/custom_logic/cmd/main.go          | 44 ++++++++++---------
 graphql/e2e/custom_logic/custom_logic_test.go | 34 +++++++-------
 protos/pb.proto                               |  2 +-
 systest/backup/encryption/backup_test.go      | 31 +++++++++++--
 systest/backup/filesystem/backup_test.go      | 41 +++++++++++++----
 systest/backup/minio-large/backup_test.go     |  6 +--
 systest/backup/minio/backup_test.go           | 32 ++++++++++++--
 systest/backup/multi-tenancy/backup_test.go   |  3 +-
 systest/online-restore/online_restore_test.go |  1 -
 testutil/backup.go                            | 44 +++----------------
 testutil/client.go                            | 36 ---------------
 worker/backup_ee.go                           | 36 +++++----------
 worker/export.go                              |  1 +
 15 files changed, 157 insertions(+), 162 deletions(-)

diff --git a/dgraph/cmd/alpha/admin_backup.go b/dgraph/cmd/alpha/admin_backup.go
index ba6b5e62192..cfcae22c82e 100644
--- a/dgraph/cmd/alpha/admin_backup.go
+++ b/dgraph/cmd/alpha/admin_backup.go
@@ -62,7 +62,5 @@ func backupHandler(w http.ResponseWriter, r *http.Request) {
 	}
 
 	w.Header().Set("Content-Type", "application/json")
-	x.Check2(w.Write([]byte(`{` +
-		`"code": "Success", ` +
-		`"message": "Backup queued successfully, please check /health for status."}`)))
+	x.Check2(w.Write([]byte(`{"code": "Success", "message": "Backup completed."}`)))
 }
diff --git a/graphql/admin/backup.go b/graphql/admin/backup.go
index 02d1812726f..a5d51f7f4ad 100644
--- a/graphql/admin/backup.go
+++ b/graphql/admin/backup.go
@@ -54,9 +54,7 @@ func resolveBackup(ctx context.Context, m schema.Mutation) (*resolve.Resolved, b
 
 	return resolve.DataResult(
 		m,
-		map[string]interface{}{
-			m.Name(): response("Success", "Backup queued successfully, please check /health for status."),
-		},
+		map[string]interface{}{m.Name(): response("Success", "Backup completed.")},
 		nil,
 	), true
 }
diff --git a/graphql/e2e/custom_logic/cmd/main.go b/graphql/e2e/custom_logic/cmd/main.go
index 75a81df7c98..a639235a661 100644
--- a/graphql/e2e/custom_logic/cmd/main.go
+++ b/graphql/e2e/custom_logic/cmd/main.go
@@ -824,7 +824,7 @@ func deleteCommonHeaders(headers http.Header) {
 func carsHandlerWithHeaders(w http.ResponseWriter, r *http.Request) {
 	deleteCommonHeaders(r.Header)
 	if err := compareHeaders(map[string][]string{
-		"Stripe-Api-Key": {"some-api-key"},
+		"Stripe-Api-Key": []string{"some-api-key"},
 	}, r.Header); err != nil {
 		check2(w.Write([]byte(err.Error())))
 		return
@@ -835,7 +835,7 @@ func carsHandlerWithHeaders(w http.ResponseWriter, r *http.Request) {
 func userNameHandlerWithHeaders(w http.ResponseWriter, r *http.Request) {
 	deleteCommonHeaders(r.Header)
 	if err := compareHeaders(map[string][]string{
-		"Github-Api-Token": {"some-api-token"},
+		"Github-Api-Token": []string{"some-api-token"},
 	}, r.Header); err != nil {
 		check2(w.Write([]byte(err.Error())))
 		return
@@ -1025,45 +1025,45 @@ func (r countryResolver) Name() *string {
 	return &(r.c.Name)
 }
 
-func (*query) Country(ctx context.Context, args struct {
+func (_ *query) Country(ctx context.Context, args struct {
 	Code string
 }) countryResolver {
 	return countryResolver{&country{Code: graphql.ID(args.Code), Name: "Burundi"}}
 }
 
-func (*query) Countries(ctx context.Context, args struct {
+func (_ *query) Countries(ctx context.Context, args struct {
 	Filter struct {
 		Code string
 		Name string
 	}
 }) []countryResolver {
-	return []countryResolver{{&country{
+	return []countryResolver{countryResolver{&country{
 		Code: graphql.ID(args.Filter.Code),
 		Name: args.Filter.Name,
 	}}}
 }
 
-func (*query) ValidCountries(ctx context.Context, args struct {
+func (_ *query) ValidCountries(ctx context.Context, args struct {
 	Code string
 }) *[]*countryResolver {
 	return &[]*countryResolver{{&country{Code: graphql.ID(args.Code), Name: "Burundi"}}}
 }
 
-func (*query) UserName(ctx context.Context, args struct {
+func (_ *query) UserName(ctx context.Context, args struct {
 	Id string
 }) *string {
 	s := fmt.Sprintf(`uname-%s`, args.Id)
 	return &s
 }
 
-func (*query) TeacherName(ctx context.Context, args struct {
+func (_ *query) TeacherName(ctx context.Context, args struct {
 	Id string
 }) *string {
 	s := fmt.Sprintf(`tname-%s`, args.Id)
 	return &s
 }
 
-func (*query) SchoolName(ctx context.Context, args struct {
+func (_ *query) SchoolName(ctx context.Context, args struct {
 	Id string
 }) *string {
 	s := fmt.Sprintf(`sname-%s`, args.Id)
@@ -1117,7 +1117,7 @@ func (r *carResolver) Name() string {
 	return "car-" + string(r.c.ID)
 }
 
-func (*query) Car(ctx context.Context, args struct {
+func (_ *query) Car(ctx context.Context, args struct {
 	Id string
 }) *carResolver {
 	return &carResolver{&car{ID: graphql.ID(args.Id)}}
@@ -1139,13 +1139,13 @@ func (r *classResolver) Name() string {
 	return "class-" + string(r.c.ID)
 }
 
-func (*query) Class(ctx context.Context, args struct {
+func (_ *query) Class(ctx context.Context, args struct {
 	Id string
 }) *[]*classResolver {
-	return &[]*classResolver{{&class{ID: graphql.ID(args.Id)}}}
+	return &[]*classResolver{&classResolver{&class{ID: graphql.ID(args.Id)}}}
 }
 
-func (*query) UserNames(ctx context.Context, args struct {
+func (_ *query) UserNames(ctx context.Context, args struct {
 	Users *[]*struct {
 		Id  string
 		Age float64
@@ -1162,7 +1162,7 @@ func (*query) UserNames(ctx context.Context, args struct {
 	return &res
 }
 
-func (*query) Cars(ctx context.Context, args struct {
+func (_ *query) Cars(ctx context.Context, args struct {
 	Users *[]*struct {
 		Id  string
 		Age float64
@@ -1178,7 +1178,7 @@ func (*query) Cars(ctx context.Context, args struct {
 	return &resolvers
 }
 
-func (*query) Classes(ctx context.Context, args struct {
+func (_ *query) Classes(ctx context.Context, args struct {
 	Schools *[]*struct {
 		Id          string
 		Established float64
@@ -1190,12 +1190,12 @@ func (*query) Classes(ctx context.Context, args struct {
 	resolvers := make([]*[]*classResolver, 0, len(*args.Schools))
 	for _, user := range *args.Schools {
 		resolvers = append(resolvers, &[]*classResolver{
-			{&class{ID: graphql.ID(user.Id)}}})
+			&classResolver{&class{ID: graphql.ID(user.Id)}}})
 	}
 	return &resolvers
 }
 
-func (*query) TeacherNames(ctx context.Context, args struct {
+func (_ *query) TeacherNames(ctx context.Context, args struct {
 	Teachers *[]*struct {
 		Tid string
 		Age float64
@@ -1212,7 +1212,7 @@ func (*query) TeacherNames(ctx context.Context, args struct {
 	return &res
 }
 
-func (*query) SchoolNames(ctx context.Context, args struct {
+func (_ *query) SchoolNames(ctx context.Context, args struct {
 	Schools *[]*struct {
 		Id          string
 		Established float64
@@ -1264,8 +1264,12 @@ func gqlCarsWithErrorHandler(w http.ResponseWriter, r *http.Request) {
 			"cars": output,
 		},
 		"errors": []map[string]interface{}{
-			{"message": "error-1 from cars"},
-			{"message": "error-2 from cars"},
+			map[string]interface{}{
+				"message": "error-1 from cars",
+			},
+			map[string]interface{}{
+				"message": "error-2 from cars",
+			},
 		},
 	}
 
diff --git a/graphql/e2e/custom_logic/custom_logic_test.go b/graphql/e2e/custom_logic/custom_logic_test.go
index 67bd722bfe6..b1b28d83190 100644
--- a/graphql/e2e/custom_logic/custom_logic_test.go
+++ b/graphql/e2e/custom_logic/custom_logic_test.go
@@ -200,9 +200,9 @@ func TestCustomQueryShouldForwardHeaders(t *testing.T) {
 	params := &common.GraphQLParams{
 		Query: query,
 		Headers: map[string][]string{
-			"X-App-Token":   {"app-token"},
-			"X-User-Id":     {"123"},
-			"Random-header": {"random"},
+			"X-App-Token":   []string{"app-token"},
+			"X-User-Id":     []string{"123"},
+			"Random-header": []string{"random"},
 		},
 	}
 
@@ -238,9 +238,9 @@ func TestCustomNameForwardHeaders(t *testing.T) {
 	params := &common.GraphQLParams{
 		Query: query,
 		Headers: map[string][]string{
-			"App":           {"app-token"},
-			"X-User-Id":     {"123"},
-			"Random-header": {"random"},
+			"App":           []string{"app-token"},
+			"X-User-Id":     []string{"123"},
+			"Random-header": []string{"random"},
 		},
 	}
 
@@ -2618,7 +2618,7 @@ func TestCustomDQL(t *testing.T) {
 			}
 		}
 		""")
-
+		
 	  dqlTweetsByAuthorFollowers: [Tweets] @custom(dql: """
 		query {
 			var(func: type(Tweets)) @filter(anyoftext(Tweets.text, "DQL")) {
@@ -2634,7 +2634,7 @@ func TestCustomDQL(t *testing.T) {
 			}
 		}
 		""")
-
+		
 	  filteredTweetsByAuthorFollowers(search: String!): [Tweets] @custom(dql: """
 		query t($search: string) {
 			var(func: type(Tweets)) @filter(anyoftext(Tweets.text, $search)) {
@@ -2859,7 +2859,7 @@ func TestCustomGetQuerywithRESTError(t *testing.T) {
 func TestCustomFieldsWithRestError(t *testing.T) {
 	schema := `
     type Car @remote {
-		id: ID!
+		id: ID! 
 		name: String!
 	}
 
@@ -2883,7 +2883,7 @@ func TestCustomFieldsWithRestError(t *testing.T) {
 			body: "{uid: $id}"
 			mode: BATCH,
 			}
-	      )
+	      )		
   	}
   `
 
@@ -2931,7 +2931,7 @@ func TestCustomFieldsWithRestError(t *testing.T) {
           "age": 10,
           "cars": {
             "name": "car-0x1"
-          }
+          }	
         }
       ]
     }`
@@ -3005,7 +3005,7 @@ func TestCustomResolverInInterfaceImplFrag(t *testing.T) {
 		id: ID!
 		name: String! @id
 	}
-
+	
 	type Human implements Character {
 		totalCredits: Int
 		bio: String @custom(http: {
@@ -3079,23 +3079,23 @@ func TestCustomFieldIsResolvedWhenNoModeGiven(t *testing.T) {
 		skipIntrospection: true,
 	  })
 	}
-
+	
 	type Blueprint {
 	  blueprintId: String! @id
 	  shallowProducts: [ItemType]
 	  deepProducts: [BlueprintProduct]
 	}
-
+	
 	type BlueprintProduct {
 	  itemType: ItemType
 	  amount: Int
 	}
-
+	
 	type MarketStats  {
 	  typeId: String! @id
-	  price: Float
+	  price: Float 
 	}
-
+	
 	type MarketStatsR @remote {
 	  typeId: String
 	  price: Float
diff --git a/protos/pb.proto b/protos/pb.proto
index fdc00a213bf..5e47958948b 100644
--- a/protos/pb.proto
+++ b/protos/pb.proto
@@ -202,7 +202,7 @@ message HealthInfo {
     repeated string ongoing = 8;
     repeated string indexing = 9;
     repeated string ee_features = 10;
-	uint64 max_assigned = 11;
+		uint64 max_assigned = 11;
 }
 
 message Tablet {
diff --git a/systest/backup/encryption/backup_test.go b/systest/backup/encryption/backup_test.go
index 45f75581769..9117d8f2205 100644
--- a/systest/backup/encryption/backup_test.go
+++ b/systest/backup/encryption/backup_test.go
@@ -16,6 +16,7 @@
 package main
 
 import (
+	"bytes"
 	"context"
 	"encoding/json"
 	"fmt"
@@ -258,8 +259,32 @@ func runBackup(t *testing.T, numExpectedFiles, numExpectedDirs int) []string {
 
 func runBackupInternal(t *testing.T, forceFull bool, numExpectedFiles,
 	numExpectedDirs int) []string {
-	testutil.StartBackupHttps(t, backupDst, forceFull)
-	testutil.WaitForTask(t, "opBackup")
+
+	backupRequest := `mutation backup($dst: String!, $ff: Boolean!) {
+		backup(input: {destination: $dst, forceFull: $ff}) {
+			response {
+				code
+				message
+			}
+		}
+	}`
+
+	adminUrl := "https://" + testutil.SockAddrHttp + "/admin"
+	params := testutil.GraphQLParams{
+		Query: backupRequest,
+		Variables: map[string]interface{}{
+			"dst": backupDst,
+			"ff":  forceFull,
+		},
+	}
+	b, err := json.Marshal(params)
+	require.NoError(t, err)
+	client := testutil.GetHttpsClient(t)
+	resp, err := client.Post(adminUrl, "application/json", bytes.NewBuffer(b))
+	require.NoError(t, err)
+	buf, err := ioutil.ReadAll(resp.Body)
+	require.NoError(t, err)
+	require.Contains(t, string(buf), "Backup completed.")
 
 	// Verify that the right amount of files and directories were created.
 	copyToLocalFs(t)
@@ -274,7 +299,7 @@ func runBackupInternal(t *testing.T, forceFull bool, numExpectedFiles,
 	})
 	require.Equal(t, numExpectedDirs, len(dirs))
 
-	b, err := ioutil.ReadFile(filepath.Join(backupDir, "manifest.json"))
+	b, err = ioutil.ReadFile(filepath.Join(backupDir, "manifest.json"))
 	require.NoError(t, err)
 
 	var manifest worker.MasterManifest
diff --git a/systest/backup/filesystem/backup_test.go b/systest/backup/filesystem/backup_test.go
index 13a7381806d..b673f9ea71a 100644
--- a/systest/backup/filesystem/backup_test.go
+++ b/systest/backup/filesystem/backup_test.go
@@ -123,9 +123,7 @@ func TestBackupOfOldRestore(t *testing.T) {
 }
 
 func TestBackupFilesystem(t *testing.T) {
-	conn, err := grpc.Dial(
-		testutil.SockAddr,
-		grpc.WithTransportCredentials(credentials.NewTLS(testutil.GetAlphaClientConfig(t))))
+	conn, err := grpc.Dial(testutil.SockAddr, grpc.WithTransportCredentials(credentials.NewTLS(testutil.GetAlphaClientConfig(t))))
 	require.NoError(t, err)
 	dg := dgo.NewDgraphClient(api.NewDgraphClient(conn))
 
@@ -141,7 +139,8 @@ func TestBackupFilesystem(t *testing.T) {
 
 	var buf bytes.Buffer
 	for i := 0; i < 10000; i++ {
-		fmt.Fprintf(&buf, "<_:x%d> <name> \"ibrahim\" .\n", i)
+		buf.Write([]byte(fmt.Sprintf(`<_:x%d> <name> "ibrahim" .
+		`, i)))
 	}
 	// Add initial data.
 	_, err = dg.NewTxn().Mutate(ctx, &api.Mutation{
@@ -367,9 +366,35 @@ func runBackup(t *testing.T, numExpectedFiles, numExpectedDirs int) []string {
 	return runBackupInternal(t, false, numExpectedFiles, numExpectedDirs)
 }
 
-func runBackupInternal(t *testing.T, forceFull bool, numExpectedFiles, numExpectedDirs int) []string {
-	testutil.StartBackupHttps(t, alphaBackupDir, forceFull)
-	testutil.WaitForTask(t, "opBackup")
+func runBackupInternal(t *testing.T, forceFull bool, numExpectedFiles,
+	numExpectedDirs int) []string {
+	backupRequest := `mutation backup($dst: String!, $ff: Boolean!) {
+			backup(input: {destination: $dst, forceFull: $ff}) {
+				response {
+					code
+					message
+				}
+			}
+		}`
+
+	adminUrl := "https://" + testutil.SockAddrHttp + "/admin"
+	params := testutil.GraphQLParams{
+		Query: backupRequest,
+		Variables: map[string]interface{}{
+			"dst": alphaBackupDir,
+			"ff":  forceFull,
+		},
+	}
+	b, err := json.Marshal(params)
+	require.NoError(t, err)
+
+	client := testutil.GetHttpsClient(t)
+	resp, err := client.Post(adminUrl, "application/json", bytes.NewBuffer(b))
+	require.NoError(t, err)
+	defer resp.Body.Close()
+	buf, err := ioutil.ReadAll(resp.Body)
+	require.NoError(t, err)
+	require.Contains(t, string(buf), "Backup completed.")
 
 	// Verify that the right amount of files and directories were created.
 	common.CopyToLocalFs(t)
@@ -384,7 +409,7 @@ func runBackupInternal(t *testing.T, forceFull bool, numExpectedFiles, numExpect
 	})
 	require.Equal(t, numExpectedDirs, len(dirs))
 
-	b, err := ioutil.ReadFile(filepath.Join(copyBackupDir, "manifest.json"))
+	b, err = ioutil.ReadFile(filepath.Join(copyBackupDir, "manifest.json"))
 	require.NoError(t, err)
 	var manifest worker.MasterManifest
 	err = json.Unmarshal(b, &manifest)
diff --git a/systest/backup/minio-large/backup_test.go b/systest/backup/minio-large/backup_test.go
index 2a09d90b90f..02d13f3d1b6 100644
--- a/systest/backup/minio-large/backup_test.go
+++ b/systest/backup/minio-large/backup_test.go
@@ -146,17 +146,15 @@ func addTriples(t *testing.T, dg *dgo.Dgraph, numTriples int) {
 func runBackup(t *testing.T) {
 	// Using the old /admin/backup endpoint to ensure it works. Change back to using
 	// the GraphQL endpoint at /admin once this endpoint is deprecated.
-	backupUrl := "https://" + testutil.SockAddrHttp + "/admin/backup"
 	client := testutil.GetHttpsClient(t)
-	resp, err := client.PostForm(backupUrl, url.Values{
+	resp, err := client.PostForm("https://"+testutil.SockAddrHttp+"/admin/backup", url.Values{
 		"destination": []string{backupDestination},
 	})
 	require.NoError(t, err)
 	defer resp.Body.Close()
 	buf, err := ioutil.ReadAll(resp.Body)
 	require.NoError(t, err)
-	require.Contains(t, string(buf), "Backup queued successfully")
-	testutil.WaitForTask(t, "opBackup")
+	require.Contains(t, string(buf), "Backup completed.")
 
 	// Verify that the right amount of files and directories were created.
 	copyToLocalFs(t)
diff --git a/systest/backup/minio/backup_test.go b/systest/backup/minio/backup_test.go
index 7713dd6c305..cb7ff3da223 100644
--- a/systest/backup/minio/backup_test.go
+++ b/systest/backup/minio/backup_test.go
@@ -16,6 +16,7 @@
 package main
 
 import (
+	"bytes"
 	"context"
 	"encoding/json"
 	"fmt"
@@ -278,8 +279,33 @@ func runBackup(t *testing.T, numExpectedFiles, numExpectedDirs int) []string {
 
 func runBackupInternal(t *testing.T, forceFull bool, numExpectedFiles,
 	numExpectedDirs int) []string {
-	testutil.StartBackupHttps(t, backupDst, forceFull)
-	testutil.WaitForTask(t, "opBackup")
+
+	backupRequest := `mutation backup($dst: String!, $ff: Boolean!) {
+		backup(input: {destination: $dst, forceFull: $ff}) {
+			response {
+				code
+				message
+			}
+		}
+	}`
+
+	adminUrl := "https://" + testutil.SockAddrHttp + "/admin"
+	params := testutil.GraphQLParams{
+		Query: backupRequest,
+		Variables: map[string]interface{}{
+			"dst": backupDst,
+			"ff":  forceFull,
+		},
+	}
+	b, err := json.Marshal(params)
+	require.NoError(t, err)
+
+	client := testutil.GetHttpsClient(t)
+	resp, err := client.Post(adminUrl, "application/json", bytes.NewBuffer(b))
+	require.NoError(t, err)
+	buf, err := ioutil.ReadAll(resp.Body)
+	require.NoError(t, err)
+	require.Contains(t, string(buf), "Backup completed.")
 
 	// Verify that the right amount of files and directories were created.
 	copyToLocalFs(t)
@@ -294,7 +320,7 @@ func runBackupInternal(t *testing.T, forceFull bool, numExpectedFiles,
 	})
 	require.Equal(t, numExpectedDirs, len(dirs))
 
-	b, err := ioutil.ReadFile(filepath.Join(backupDir, "manifest.json"))
+	b, err = ioutil.ReadFile(filepath.Join(backupDir, "manifest.json"))
 	require.NoError(t, err)
 
 	var manifest worker.MasterManifest
diff --git a/systest/backup/multi-tenancy/backup_test.go b/systest/backup/multi-tenancy/backup_test.go
index 036ad43aa00..712336a1f34 100644
--- a/systest/backup/multi-tenancy/backup_test.go
+++ b/systest/backup/multi-tenancy/backup_test.go
@@ -159,8 +159,7 @@ func runBackupInternal(t *testing.T, token *testutil.HttpToken, forceFull bool,
 		}
 	}
 	require.NoError(t, json.Unmarshal(resp.Data, &result))
-	require.Contains(t, result.Backup.Response.Message, "Backup queued successfully")
-	testutil.WaitForTask(t, "opBackup")
+	require.Contains(t, result.Backup.Response.Message, "Backup completed.")
 
 	// Verify that the right amount of files and directories were created.
 	common.CopyToLocalFs(t)
diff --git a/systest/online-restore/online_restore_test.go b/systest/online-restore/online_restore_test.go
index 1faa1e1a398..433590974c7 100644
--- a/systest/online-restore/online_restore_test.go
+++ b/systest/online-restore/online_restore_test.go
@@ -563,7 +563,6 @@ func backup(t *testing.T, backupDir string) {
 	}
 	testutil.MakeGQLRequestWithTLS(t, backupParams, testutil.GetAlphaClientConfig(t)).
 		RequireNoGraphQLErrors(t)
-	testutil.WaitForTask(t, "opBackup")
 }
 
 func backupRestoreAndVerify(t *testing.T, dg *dgo.Dgraph, backupDir, queryToVerify,
diff --git a/testutil/backup.go b/testutil/backup.go
index 98f8393fff1..6fe3ba669df 100644
--- a/testutil/backup.go
+++ b/testutil/backup.go
@@ -17,9 +17,7 @@
 package testutil
 
 import (
-	"bytes"
 	"context"
-	"encoding/json"
 	"fmt"
 	"io/ioutil"
 	"net/http"
@@ -62,49 +60,21 @@ func openDgraph(pdir string) (*badger.DB, error) {
 	return badger.OpenManaged(opt)
 }
 
-func StartBackupHttps(t *testing.T, backupDst string, forceFull bool) {
-	const backupRequest = `mutation backup($dst: String!, $ff: Boolean!) {
-		backup(input: {destination: $dst, forceFull: $ff}) {
-			response {
-				code
-				message
-			}
-		}
-	}`
-
-	adminUrl := "https://" + SockAddrHttp + "/admin"
-	params := GraphQLParams{
-		Query: backupRequest,
-		Variables: map[string]interface{}{
-			"dst": backupDst,
-			"ff":  forceFull,
-		},
-	}
-
-	var buffer bytes.Buffer
-	err := json.NewEncoder(&buffer).Encode(params)
-	require.NoError(t, err)
-
-	client := GetHttpsClient(t)
-	response, err := client.Post(adminUrl, "application/json", &buffer)
-	require.NoError(t, err)
-
-	responseBody, err := ioutil.ReadAll(response.Body)
-	require.NoError(t, err)
-	require.Contains(t, string(responseBody), "Backup queued successfully")
-}
-
 func WaitForRestore(t *testing.T, dg *dgo.Dgraph) {
+	restoreDone := false
 	for {
 		resp, err := http.Get("http://" + SockAddrHttp + "/health")
 		require.NoError(t, err)
 		buf, err := ioutil.ReadAll(resp.Body)
 		require.NoError(t, err)
-		if !strings.Contains(string(buf), "opRestore") {
+		sbuf := string(buf)
+		if !strings.Contains(sbuf, "opRestore") {
+			restoreDone = true
 			break
 		}
 		time.Sleep(4 * time.Second)
 	}
+	require.True(t, restoreDone)
 
 	// Wait for the client to exit draining mode. This is needed because the client might
 	// be connected to a follower and might be behind the leader in applying the restore.
@@ -120,7 +90,7 @@ func WaitForRestore(t *testing.T, dg *dgo.Dgraph) {
 	   }}`)
 
 		if err == nil {
-			numSuccess++
+			numSuccess += 1
 		} else {
 			require.Contains(t, err.Error(), "the server is in draining mode")
 			numSuccess = 0
@@ -132,7 +102,7 @@ func WaitForRestore(t *testing.T, dg *dgo.Dgraph) {
 			// The server has been responsive three times in a row.
 			break
 		}
-		time.Sleep(time.Second)
+		time.Sleep(1 * time.Second)
 	}
 }
 
diff --git a/testutil/client.go b/testutil/client.go
index 7abb9cc86aa..5641fc65971 100644
--- a/testutil/client.go
+++ b/testutil/client.go
@@ -33,7 +33,6 @@ import (
 	"time"
 
 	"github.com/dgraph-io/dgraph/gql"
-	"github.com/dgraph-io/dgraph/protos/pb"
 
 	"github.com/dgraph-io/dgo/v210"
 	"github.com/dgraph-io/dgo/v210/protos/api"
@@ -71,10 +70,6 @@ func AdminUrl() string {
 	return "http://" + SockAddrHttp + "/admin"
 }
 
-func HealthUrl() string {
-	return "http://" + SockAddrHttp + "/health"
-}
-
 // This allows running (most) tests against dgraph running on the default ports, for example.
 // Only the GRPC ports are needed and the others are deduced.
 func init() {
@@ -533,34 +528,3 @@ func GetAlphaClientConfig(t *testing.T) *tls.Config {
 	require.NoError(t, err)
 	return tlsConf
 }
-
-func WaitForTask(t *testing.T, task string) {
-	healthUrl := "http://" + SockAddrHttp + "/health"
-	for {
-		time.Sleep(5 * time.Second)
-
-		var health []pb.HealthInfo
-		func() {
-			// #nosec G107
-			response, err := http.Get(healthUrl)
-			require.NoError(t, err)
-			defer response.Body.Close()
-
-			decoder := json.NewDecoder(response.Body)
-			err = decoder.Decode(&health)
-			require.NoError(t, err)
-			require.Len(t, health, 1)
-		}()
-
-		completed := true
-		for _, ongoingTask := range health[0].Ongoing {
-			if ongoingTask == task {
-				completed = false
-				break
-			}
-		}
-		if completed {
-			break
-		}
-	}
-}
diff --git a/worker/backup_ee.go b/worker/backup_ee.go
index 12a768edecc..c1aed1c6461 100644
--- a/worker/backup_ee.go
+++ b/worker/backup_ee.go
@@ -119,27 +119,14 @@ func ProcessBackupRequest(ctx context.Context, req *pb.BackupRequest, forceFull
 	}
 
 	if err := x.HealthCheck(); err != nil {
-		glog.Errorf("Backup canceled: not ready to accept requests: %s", err)
+		glog.Errorf("Backup canceled, not ready to accept requests: %s", err)
 		return err
 	}
 
-	go func() {
-		// Grab the lock here to avoid more than one request to be processed at the same time.
-		backupLock.Lock()
-		defer backupLock.Unlock()
+	// Grab the lock here to avoid more than one request to be processed at the same time.
+	backupLock.Lock()
+	defer backupLock.Unlock()
 
-		glog.Infof("Backup started: %s", req.Destination)
-		if err := doBackup(ctx, req, forceFull); err != nil {
-			glog.Errorf("Backup error: %s: %s", err, req.Destination)
-		} else {
-			glog.Infof("Backup complete: %s", req.Destination)
-		}
-	}()
-
-	return nil
-}
-
-func doBackup(ctx context.Context, req *pb.BackupRequest, forceFull bool) error {
 	backupSuccessful := false
 	ostats.Record(ctx, x.NumBackups.M(1), x.PendingBackups.M(1))
 	defer func() {
@@ -208,16 +195,13 @@ func doBackup(ctx context.Context, req *pb.BackupRequest, forceFull bool) error
 	predMap := make(map[uint32][]string)
 	for gid, group := range state.Groups {
 		groups = append(groups, gid)
-		preds := make([]string, 0, len(group.Tablets))
+		predMap[gid] = make([]string, 0)
 		for pred := range group.Tablets {
-			preds = append(preds, pred)
+			predMap[gid] = append(predMap[gid], pred)
 		}
-		predMap[gid] = preds
 	}
 
-	glog.Infof(
-		"Created backup request: read_ts:%d since_ts:%d unix_ts:%q destination:%q. Groups=%v\n",
-		req.ReadTs, req.SinceTs, req.UnixTs, req.Destination, groups)
+	glog.Infof("Created backup request: read_ts:%d since_ts:%d unix_ts:\"%s\" destination:\"%s\" . Groups=%v\n", req.ReadTs, req.SinceTs, req.UnixTs, req.Destination, groups)
 	ctx, cancel := context.WithCancel(ctx)
 	defer cancel()
 
@@ -282,7 +266,11 @@ func ProcessListBackups(ctx context.Context, location string, creds *x.MinioCred
 		return nil, errors.Wrapf(err, "cannot read manifests at location %s", location)
 	}
 
-	return manifests, nil
+	res := make([]*Manifest, 0)
+	for _, m := range manifests {
+		res = append(res, m)
+	}
+	return res, nil
 }
 
 // BackupProcessor handles the different stages of the backup process.
diff --git a/worker/export.go b/worker/export.go
index a107dd90b40..a6bc99034ed 100644
--- a/worker/export.go
+++ b/worker/export.go
@@ -553,6 +553,7 @@ func NewExportStorage(in *pb.ExportRequest, backupName string) (ExportStorage, e
 
 // export creates a export of data by exporting it as an RDF gzip.
 func export(ctx context.Context, in *pb.ExportRequest) (ExportedFiles, error) {
+
 	if in.GroupId != groups().groupId() {
 		return nil, errors.Errorf("Export request group mismatch. Mine: %d. Requested: %d",
 			groups().groupId(), in.GroupId)

From 77f3ceff0c771fdab0f137029af7710d908becaf Mon Sep 17 00:00:00 2001
From: Ajeet D'Souza <98ajeet@gmail.com>
Date: Mon, 3 May 2021 15:02:04 +0530
Subject: [PATCH 2/5] feat(Dgraph): Add task queue implementation (#7716)

---
 dgraph/cmd/alpha/admin.go                   |  42 --
 dgraph/cmd/alpha/admin_backup.go            |  66 --
 dgraph/cmd/alpha/run.go                     |   1 +
 go.mod                                      |   2 +-
 go.sum                                      |   6 +-
 graphql/admin/admin.go                      |  48 +-
 graphql/admin/backup.go                     |  21 +-
 graphql/admin/endpoints_ee.go               |   1 +
 graphql/admin/export.go                     |  24 +-
 graphql/admin/task.go                       |  70 ++
 protos/pb.proto                             |   8 +-
 protos/pb/pb.pb.go                          | 710 +++++++++++---------
 systest/backup/encryption/backup_test.go    |  12 +-
 systest/backup/filesystem/backup_test.go    |  11 +-
 systest/backup/minio-large/backup_test.go   |  39 +-
 systest/backup/minio/backup_test.go         |  12 +-
 systest/backup/multi-tenancy/backup_test.go |  17 +-
 systest/export/export_test.go               |  84 +--
 systest/mutations_test.go                   |   4 +-
 testutil/backup.go                          |   2 +-
 testutil/utils.go                           |  61 +-
 worker/backup_ee.go                         |  16 +-
 worker/backup_oss.go                        |   2 +-
 worker/export.go                            |   2 +-
 worker/queue.go                             | 357 ++++++++++
 worker/worker_test.go                       |  30 +-
 26 files changed, 1053 insertions(+), 595 deletions(-)
 delete mode 100644 dgraph/cmd/alpha/admin_backup.go
 create mode 100644 graphql/admin/task.go
 create mode 100644 worker/queue.go

diff --git a/dgraph/cmd/alpha/admin.go b/dgraph/cmd/alpha/admin.go
index 32f498853d4..62e1f248377 100644
--- a/dgraph/cmd/alpha/admin.go
+++ b/dgraph/cmd/alpha/admin.go
@@ -83,8 +83,6 @@ func getAdminMux() *http.ServeMux {
 		http.MethodPut:  true,
 		http.MethodPost: true,
 	}, adminAuthHandler(http.HandlerFunc(drainingHandler))))
-	adminMux.Handle("/admin/export", allowedMethodsHandler(allowedMethods{http.MethodGet: true},
-		adminAuthHandler(http.HandlerFunc(exportHandler))))
 	adminMux.Handle("/admin/config/cache_mb", allowedMethodsHandler(allowedMethods{
 		http.MethodGet: true,
 		http.MethodPut: true,
@@ -160,46 +158,6 @@ func shutDownHandler(w http.ResponseWriter, r *http.Request) {
 	x.Check2(w.Write([]byte(`{"code": "Success", "message": "Server is shutting down"}`)))
 }
 
-func exportHandler(w http.ResponseWriter, r *http.Request) {
-	if err := r.ParseForm(); err != nil {
-		x.SetHttpStatus(w, http.StatusBadRequest, "Parse of export request failed.")
-		return
-	}
-
-	format := worker.DefaultExportFormat
-	if vals, ok := r.Form["format"]; ok {
-		if len(vals) > 1 {
-			x.SetHttpStatus(w, http.StatusBadRequest,
-				"Only one export format may be specified.")
-			return
-		}
-		format = worker.NormalizeExportFormat(vals[0])
-		if format == "" {
-			x.SetHttpStatus(w, http.StatusBadRequest, "Invalid export format.")
-			return
-		}
-	}
-
-	gqlReq := &schema.Request{
-		Query: `
-		mutation export($format: String) {
-		  export(input: {format: $format}) {
-			response {
-			  code
-			}
-		  }
-		}`,
-		Variables: map[string]interface{}{},
-	}
-
-	if resp := resolveWithAdminServer(gqlReq, r, adminServer); len(resp.Errors) != 0 {
-		x.SetStatus(w, resp.Errors[0].Message, "Export failed.")
-		return
-	}
-	w.Header().Set("Content-Type", "application/json")
-	x.Check2(w.Write([]byte(`{"code": "Success", "message": "Export completed."}`)))
-}
-
 func memoryLimitHandler(w http.ResponseWriter, r *http.Request) {
 	switch r.Method {
 	case http.MethodGet:
diff --git a/dgraph/cmd/alpha/admin_backup.go b/dgraph/cmd/alpha/admin_backup.go
deleted file mode 100644
index cfcae22c82e..00000000000
--- a/dgraph/cmd/alpha/admin_backup.go
+++ /dev/null
@@ -1,66 +0,0 @@
-// +build !oss
-
-/*
- * Copyright 2018 Dgraph Labs, Inc. and Contributors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package alpha
-
-import (
-	"net/http"
-
-	"github.com/dgraph-io/dgraph/graphql/schema"
-
-	"github.com/dgraph-io/dgraph/x"
-	"github.com/golang/glog"
-)
-
-func init() {
-	http.Handle("/admin/backup", allowedMethodsHandler(allowedMethods{http.MethodPost: true},
-		adminAuthHandler(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-			backupHandler(w, r)
-		}))))
-}
-
-// backupHandler handles backup requests coming from the HTTP endpoint.
-func backupHandler(w http.ResponseWriter, r *http.Request) {
-	gqlReq := &schema.Request{
-		Query: `
-		mutation backup($input: BackupInput!) {
-		  backup(input: $input) {
-			response {
-			  code
-			}
-		  }
-		}`,
-		Variables: map[string]interface{}{"input": map[string]interface{}{
-			"destination":  r.FormValue("destination"),
-			"accessKey":    r.FormValue("access_key"),
-			"secretKey":    r.FormValue("secret_key"),
-			"sessionToken": r.FormValue("session_token"),
-			"anonymous":    r.FormValue("anonymous") == "true",
-			"forceFull":    r.FormValue("force_full") == "true",
-		}},
-	}
-	glog.Infof("gqlReq %+v, r %+v adminServer %+v", gqlReq, r, adminServer)
-	resp := resolveWithAdminServer(gqlReq, r, adminServer)
-	if resp.Errors != nil {
-		x.SetStatus(w, resp.Errors.Error(), "Backup failed.")
-		return
-	}
-
-	w.Header().Set("Content-Type", "application/json")
-	x.Check2(w.Write([]byte(`{"code": "Success", "message": "Backup completed."}`)))
-}
diff --git a/dgraph/cmd/alpha/run.go b/dgraph/cmd/alpha/run.go
index 881f3fff6cb..761ee81ef14 100644
--- a/dgraph/cmd/alpha/run.go
+++ b/dgraph/cmd/alpha/run.go
@@ -749,6 +749,7 @@ func run() {
 	glog.Infof("worker.Config: %+v", worker.Config)
 
 	worker.InitServerState()
+	worker.InitTasks()
 
 	if Alpha.Conf.GetBool("expose_trace") {
 		// TODO: Remove this once we get rid of event logs.
diff --git a/go.mod b/go.mod
index 2f3d0b462ea..0855dcc4e0d 100644
--- a/go.mod
+++ b/go.mod
@@ -19,7 +19,7 @@ require (
 	github.com/dgraph-io/gqlgen v0.13.2
 	github.com/dgraph-io/gqlparser/v2 v2.2.0
 	github.com/dgraph-io/graphql-transport-ws v0.0.0-20210223074046-e5b8b80bb4ed
-	github.com/dgraph-io/ristretto v0.0.4-0.20210310100713-a4346e5d1f90
+	github.com/dgraph-io/ristretto v0.0.4-0.20210430144708-642987276d6a
 	github.com/dgraph-io/simdjson-go v0.3.0
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
 	github.com/dgrijalva/jwt-go/v4 v4.0.0-preview1
diff --git a/go.sum b/go.sum
index e043e8f4ba5..ebc2835dca7 100644
--- a/go.sum
+++ b/go.sum
@@ -89,6 +89,8 @@ github.com/cenkalti/backoff v2.1.1+incompatible/go.mod h1:90ReRw6GdpyfrHakVjL/QH
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/cespare/xxhash v1.1.0 h1:a6HrQnmkObjyL+Gs60czilIUGqrzKutQD6XZog3p+ko=
 github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
+github.com/cespare/xxhash/v2 v2.1.1 h1:6MnRN8NT7+YBpUIWxHtefFZOKTAPgGjpQSxqLNn0+qY=
+github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
 github.com/codahale/hdrhistogram v0.0.0-20161010025455-3a0bb77429bd h1:qMd81Ts1T2OTKmB4acZcyKaMtRnY5Y44NuXGX2GFJ1w=
 github.com/codahale/hdrhistogram v0.0.0-20161010025455-3a0bb77429bd/go.mod h1:sE/e/2PUdi/liOCUjSTXgM1o87ZssimdTWN964YiIeI=
@@ -129,8 +131,8 @@ github.com/dgraph-io/gqlparser/v2 v2.2.0/go.mod h1:MYS4jppjyx8b9tuUtjV7jU1UFZK6P
 github.com/dgraph-io/graphql-transport-ws v0.0.0-20210223074046-e5b8b80bb4ed h1:pgGMBoTtFhR+xkyzINaToLYRurHn+6pxMYffIGmmEPc=
 github.com/dgraph-io/graphql-transport-ws v0.0.0-20210223074046-e5b8b80bb4ed/go.mod h1:7z3c/5w0sMYYZF5bHsrh8IH4fKwG5O5Y70cPH1ZLLRQ=
 github.com/dgraph-io/ristretto v0.0.4-0.20210309073149-3836124cdc5a/go.mod h1:MIonLggsKgZLUSt414ExgwNtlOL5MuEoAJP514mwGe8=
-github.com/dgraph-io/ristretto v0.0.4-0.20210310100713-a4346e5d1f90 h1:arWVlUO9NhZ/2vWprIqpe825GISUPpgJhU/b0ep3j/M=
-github.com/dgraph-io/ristretto v0.0.4-0.20210310100713-a4346e5d1f90/go.mod h1:MIonLggsKgZLUSt414ExgwNtlOL5MuEoAJP514mwGe8=
+github.com/dgraph-io/ristretto v0.0.4-0.20210430144708-642987276d6a h1:www55JYSP8aYgBPNWJLeMS/HJMba6emZyBF65/a4XRI=
+github.com/dgraph-io/ristretto v0.0.4-0.20210430144708-642987276d6a/go.mod h1:fux0lOrBhrVCJd3lcTHsIJhq1T2rokOu6v9Vcb3Q9ug=
 github.com/dgraph-io/simdjson-go v0.3.0 h1:h71LO7vR4LHMPUhuoGN8bqGm1VNfGOlAG8BI6iDUKw0=
 github.com/dgraph-io/simdjson-go v0.3.0/go.mod h1:Otpysdjaxj9OGaJusn4pgQV7OFh2bELuHANq0I78uvY=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumCAMpl/TFQ4/5kLM=
diff --git a/graphql/admin/admin.go b/graphql/admin/admin.go
index 33ef7068491..203c6c5a914 100644
--- a/graphql/admin/admin.go
+++ b/graphql/admin/admin.go
@@ -55,9 +55,9 @@ const (
     """
 	The UInt64 scalar type represents an unsigned 64‐bit numeric non‐fractional value.
 	UInt64 can represent values in range [0,(2^64 - 1)].
-	""" 
+	"""
     scalar UInt64
-	
+
 	"""
 	The DateTime scalar type represents date and time as a string in RFC3339 format.
 	For example: "1985-04-12T23:20:50.52Z" represents 20 minutes and 50.52 seconds after the 23rd hour of April 12th, 1985 in UTC.
@@ -243,14 +243,19 @@ const (
 		anonymous: Boolean
 	}
 
+	input TaskInput {
+		id: String!
+	}
+
 	type Response {
 		code: String
 		message: String
 	}
 
 	type ExportPayload {
-		response: Response
 		exportedFiles: [String]
+		response: Response
+		taskId: String
 	}
 
 	type DrainingPayload {
@@ -261,6 +266,26 @@ const (
 		response: Response
 	}
 
+	type TaskPayload {
+		kind: TaskKind
+		status: TaskStatus
+		lastUpdated: DateTime
+	}
+
+	enum TaskStatus {
+		Queued
+		Running
+		Failed
+		Success
+		Unknown
+	}
+
+	enum TaskKind {
+		Backup
+		Export
+		Unknown
+	}
+
 	input ConfigInput {
 		"""
 		Estimated memory the caches can take. Actual usage by the process would be
@@ -367,6 +392,7 @@ const (
 		health: [NodeState]
 		state: MembershipState
 		config: Config
+		task(input: TaskInput!): TaskPayload
 		` + adminQueries + `
 	}
 
@@ -718,7 +744,6 @@ func newAdminResolver(
 }
 
 func newAdminResolverFactory() resolve.ResolverFactory {
-
 	adminMutationResolvers := map[string]resolve.MutationResolverFunc{
 		"addNamespace":      resolveAddNamespace,
 		"backup":            resolveBackup,
@@ -751,18 +776,21 @@ func newAdminResolverFactory() resolve.ResolverFactory {
 		WithQueryResolver("listBackups", func(q schema.Query) resolve.QueryResolver {
 			return resolve.QueryResolverFunc(resolveListBackups)
 		}).
-		WithMutationResolver("updateGQLSchema", func(m schema.Mutation) resolve.MutationResolver {
-			return resolve.MutationResolverFunc(
-				func(ctx context.Context, m schema.Mutation) (*resolve.Resolved, bool) {
-					return &resolve.Resolved{Err: errors.Errorf(errMsgServerNotReady), Field: m},
-						false
-				})
+		WithQueryResolver("task", func(q schema.Query) resolve.QueryResolver {
+			return resolve.QueryResolverFunc(resolveTask)
 		}).
 		WithQueryResolver("getGQLSchema", func(q schema.Query) resolve.QueryResolver {
 			return resolve.QueryResolverFunc(
 				func(ctx context.Context, query schema.Query) *resolve.Resolved {
 					return &resolve.Resolved{Err: errors.Errorf(errMsgServerNotReady), Field: q}
 				})
+		}).
+		WithMutationResolver("updateGQLSchema", func(m schema.Mutation) resolve.MutationResolver {
+			return resolve.MutationResolverFunc(
+				func(ctx context.Context, m schema.Mutation) (*resolve.Resolved, bool) {
+					return &resolve.Resolved{Err: errors.Errorf(errMsgServerNotReady), Field: m},
+						false
+				})
 		})
 	for gqlMut, resolver := range adminMutationResolvers {
 		// gotta force go to evaluate the right function at each loop iteration
diff --git a/graphql/admin/backup.go b/graphql/admin/backup.go
index a5d51f7f4ad..0405d07ebc1 100644
--- a/graphql/admin/backup.go
+++ b/graphql/admin/backup.go
@@ -19,6 +19,7 @@ package admin
 import (
 	"context"
 	"encoding/json"
+	"fmt"
 
 	"github.com/dgraph-io/dgraph/graphql/resolve"
 	"github.com/dgraph-io/dgraph/graphql/schema"
@@ -34,27 +35,39 @@ type backupInput struct {
 
 func resolveBackup(ctx context.Context, m schema.Mutation) (*resolve.Resolved, bool) {
 	glog.Info("Got backup request")
+	if !worker.EnterpriseEnabled() {
+		err := fmt.Errorf("you must enable enterprise features first. " +
+			"Supply the appropriate license file to Dgraph Zero using the HTTP endpoint.")
+		return resolve.EmptyResult(m, err), false
+	}
 
 	input, err := getBackupInput(m)
 	if err != nil {
 		return resolve.EmptyResult(m, err), false
 	}
+	if input.Destination == "" {
+		err := fmt.Errorf("you must specify a 'destination' value")
+		return resolve.EmptyResult(m, err), false
+	}
 
-	err = worker.ProcessBackupRequest(context.Background(), &pb.BackupRequest{
+	req := &pb.BackupRequest{
 		Destination:  input.Destination,
 		AccessKey:    input.AccessKey,
 		SecretKey:    input.SecretKey,
 		SessionToken: input.SessionToken,
 		Anonymous:    input.Anonymous,
-	}, input.ForceFull)
-
+	}
+	taskId, err := worker.Tasks.Enqueue(req)
 	if err != nil {
 		return resolve.EmptyResult(m, err), false
 	}
 
+	msg := fmt.Sprintf("Backup queued with ID %s", taskId)
+	data := response("Success", msg)
+	data["taskId"] = taskId
 	return resolve.DataResult(
 		m,
-		map[string]interface{}{m.Name(): response("Success", "Backup completed.")},
+		map[string]interface{}{m.Name(): data},
 		nil,
 	), true
 }
diff --git a/graphql/admin/endpoints_ee.go b/graphql/admin/endpoints_ee.go
index 819caa93da4..9618461d192 100644
--- a/graphql/admin/endpoints_ee.go
+++ b/graphql/admin/endpoints_ee.go
@@ -48,6 +48,7 @@ const adminTypes = `
 
 	type BackupPayload {
 		response: Response
+		taskId: String
 	}
 
 	input RestoreInput {
diff --git a/graphql/admin/export.go b/graphql/admin/export.go
index f778c18d6a4..45658dfccda 100644
--- a/graphql/admin/export.go
+++ b/graphql/admin/export.go
@@ -19,6 +19,7 @@ package admin
 import (
 	"context"
 	"encoding/json"
+	"fmt"
 	"math"
 
 	"github.com/dgraph-io/dgraph/graphql/resolve"
@@ -39,7 +40,6 @@ type exportInput struct {
 }
 
 func resolveExport(ctx context.Context, m schema.Mutation) (*resolve.Resolved, bool) {
-
 	glog.Info("Got export request through GraphQL admin API")
 
 	input, err := getExportInput(m)
@@ -83,7 +83,7 @@ func resolveExport(ctx context.Context, m schema.Mutation) (*resolve.Resolved, b
 		return resolve.EmptyResult(m, err), false
 	}
 
-	files, err := worker.ExportOverNetwork(ctx, &pb.ExportRequest{
+	req := &pb.ExportRequest{
 		Format:       format,
 		Namespace:    exportNs,
 		Destination:  input.Destination,
@@ -91,30 +91,22 @@ func resolveExport(ctx context.Context, m schema.Mutation) (*resolve.Resolved, b
 		SecretKey:    input.SecretKey,
 		SessionToken: input.SessionToken,
 		Anonymous:    input.Anonymous,
-	})
+	}
+	taskId, err := worker.Tasks.Enqueue(req)
 	if err != nil {
 		return resolve.EmptyResult(m, err), false
 	}
 
-	responseData := response("Success", "Export completed.")
-	responseData["exportedFiles"] = toInterfaceSlice(files)
-
+	msg := fmt.Sprintf("Export queued with ID %s", taskId)
+	data := response("Success", msg)
+	data["taskId"] = taskId
 	return resolve.DataResult(
 		m,
-		map[string]interface{}{m.Name(): responseData},
+		map[string]interface{}{m.Name(): data},
 		nil,
 	), true
 }
 
-// toInterfaceSlice converts []string to []interface{}
-func toInterfaceSlice(in []string) []interface{} {
-	out := make([]interface{}, 0, len(in))
-	for _, s := range in {
-		out = append(out, s)
-	}
-	return out
-}
-
 func getExportInput(m schema.Mutation) (*exportInput, error) {
 	inputArg := m.ArgValue(schema.InputArgName)
 	inputByts, err := json.Marshal(inputArg)
diff --git a/graphql/admin/task.go b/graphql/admin/task.go
new file mode 100644
index 00000000000..e377f3fa082
--- /dev/null
+++ b/graphql/admin/task.go
@@ -0,0 +1,70 @@
+/*
+ * Copyright 2021 Dgraph Labs, Inc. and Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package admin
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"github.com/dgraph-io/dgraph/graphql/resolve"
+	"github.com/dgraph-io/dgraph/graphql/schema"
+	"github.com/dgraph-io/dgraph/worker"
+)
+
+type taskInput struct {
+	Id string
+}
+
+func resolveTask(ctx context.Context, q schema.Query) *resolve.Resolved {
+	input, err := getTaskInput(q)
+	if err != nil {
+		return resolve.EmptyResult(q, err)
+	}
+	if input.Id == "" {
+		return resolve.EmptyResult(q, fmt.Errorf("task ID is missing"))
+	}
+
+	meta, err := worker.Tasks.Get(input.Id)
+	if err != nil {
+		return resolve.EmptyResult(q, err)
+	}
+	return resolve.DataResult(
+		q,
+		map[string]interface{}{q.Name(): map[string]interface{}{
+			"kind":        meta.Kind().String(),
+			"status":      meta.Status().String(),
+			"lastUpdated": meta.Timestamp().Format(time.RFC3339),
+		}},
+		nil,
+	)
+}
+
+func getTaskInput(q schema.Query) (*taskInput, error) {
+	inputArg := q.ArgValue(schema.InputArgName)
+	inputBytes, err := json.Marshal(inputArg)
+	if err != nil {
+		return nil, schema.GQLWrapf(err, "couldn't get input argument")
+	}
+
+	var input taskInput
+	if err := json.Unmarshal(inputBytes, &input); err != nil {
+		return nil, schema.GQLWrapf(err, "couldn't get input argument")
+	}
+	return &input, nil
+}
diff --git a/protos/pb.proto b/protos/pb.proto
index 5e47958948b..24d3ce7d17c 100644
--- a/protos/pb.proto
+++ b/protos/pb.proto
@@ -631,9 +631,13 @@ message Status {
 	string msg = 2;
 }
 
+// Backups record all data from since_ts to read_ts.
+// With incremental backups, the read_ts of the first backup becomes
+// the since_ts of the second backup.
+// Incremental backups can be disabled using the force_full field.
 message BackupRequest {
 	uint64 read_ts = 1;
-  uint64 since_ts = 2;
+	uint64 since_ts = 2;
 	uint32 group_id = 3;
 	string unix_ts = 4;
 	string destination = 5;
@@ -648,6 +652,8 @@ message BackupRequest {
 	// The predicates to backup. All other predicates present in the group (e.g
 	// stale data from a predicate move) will be ignored.
 	repeated string predicates = 10;
+
+	bool force_full = 11;
 }
 
 message BackupResponse {
diff --git a/protos/pb/pb.pb.go b/protos/pb/pb.pb.go
index f1652350f08..a8c66a442f7 100644
--- a/protos/pb/pb.pb.go
+++ b/protos/pb/pb.pb.go
@@ -4559,6 +4559,10 @@ func (m *Status) GetMsg() string {
 	return ""
 }
 
+// Backups record all data from since_ts to read_ts.
+// With incremental backups, the read_ts of the first backup becomes
+// the since_ts of the second backup.
+// Incremental backups can be disabled using the force_full field.
 type BackupRequest struct {
 	ReadTs       uint64 `protobuf:"varint,1,opt,name=read_ts,json=readTs,proto3" json:"read_ts,omitempty"`
 	SinceTs      uint64 `protobuf:"varint,2,opt,name=since_ts,json=sinceTs,proto3" json:"since_ts,omitempty"`
@@ -4574,6 +4578,7 @@ type BackupRequest struct {
 	// The predicates to backup. All other predicates present in the group (e.g
 	// stale data from a predicate move) will be ignored.
 	Predicates []string `protobuf:"bytes,10,rep,name=predicates,proto3" json:"predicates,omitempty"`
+	ForceFull  bool     `protobuf:"varint,11,opt,name=force_full,json=forceFull,proto3" json:"force_full,omitempty"`
 }
 
 func (m *BackupRequest) Reset()         { *m = BackupRequest{} }
@@ -4679,6 +4684,13 @@ func (m *BackupRequest) GetPredicates() []string {
 	return nil
 }
 
+func (m *BackupRequest) GetForceFull() bool {
+	if m != nil {
+		return m.ForceFull
+	}
+	return false
+}
+
 type BackupResponse struct {
 	DropOperations []*DropOperation `protobuf:"bytes,1,rep,name=drop_operations,json=dropOperations,proto3" json:"drop_operations,omitempty"`
 }
@@ -5442,338 +5454,339 @@ func init() {
 func init() { proto.RegisterFile("pb.proto", fileDescriptor_f80abaa17e25ccc8) }
 
 var fileDescriptor_f80abaa17e25ccc8 = []byte{
-	// 5283 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xd4, 0x7b, 0x4b, 0x6f, 0x1c, 0x67,
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+	0x86, 0xf1, 0xa1, 0x34, 0x63, 0x51, 0x70, 0x6f, 0x97, 0xe8, 0x5a, 0xd9, 0xc7, 0x21, 0xfa, 0xc2,
+	0x83, 0x92, 0x58, 0xe3, 0x8f, 0x52, 0x93, 0x8f, 0x6d, 0x3b, 0x89, 0xeb, 0x4c, 0xae, 0xf5, 0x52,
+	0x61, 0xbe, 0xbe, 0xb0, 0x4a, 0xe3, 0x3f, 0xf3, 0x1d, 0x6f, 0x8b, 0x3f, 0x85, 0x14, 0xb3, 0xae,
+	0xf6, 0xec, 0x0c, 0x71, 0x0f, 0xea, 0xbb, 0x11, 0xfa, 0xf4, 0x97, 0x87, 0x12, 0x6d, 0xf2, 0xee,
+	0xbe, 0xbe, 0xb0, 0xfe, 0xf3, 0x1a, 0x54, 0x7f, 0x2c, 0x43, 0x5f, 0x7c, 0x08, 0x0d, 0xf5, 0x29,
+	0x8d, 0xc8, 0x7d, 0x32, 0xb3, 0x44, 0xe9, 0x85, 0x99, 0x6f, 0x6c, 0x68, 0x97, 0x1e, 0x93, 0x37,
+	0xab, 0xa2, 0x88, 0xec, 0x4b, 0x9f, 0x4b, 0x87, 0xfa, 0x18, 0x7a, 0xc3, 0x38, 0x94, 0xe6, 0x24,
+	0x37, 0xbc, 0x48, 0xaa, 0x79, 0x25, 0x19, 0xa2, 0xd7, 0x5d, 0xa8, 0x73, 0xe0, 0x34, 0x33, 0x61,
+	0xb6, 0xde, 0x42, 0x83, 0xdf, 0x87, 0xd6, 0xf0, 0xc4, 0x9f, 0xba, 0xf6, 0x50, 0x86, 0x67, 0x52,
+	0xe4, 0x3e, 0xca, 0x5b, 0xca, 0xb5, 0xf5, 0x05, 0xf1, 0x3e, 0x68, 0xec, 0x2a, 0xa3, 0xa3, 0xdc,
+	0x50, 0xde, 0x37, 0xaf, 0x99, 0x73, 0xa1, 0xf5, 0x05, 0xb1, 0x0a, 0x90, 0x0b, 0x9f, 0x5e, 0x36,
+	0xf2, 0x21, 0x74, 0xb6, 0x48, 0xeb, 0x1c, 0x84, 0x1b, 0x87, 0x7e, 0x18, 0x8b, 0xd9, 0xaf, 0xf0,
+	0x96, 0x66, 0x11, 0xfa, 0x82, 0x78, 0x00, 0xcd, 0x51, 0x78, 0xc1, 0xe3, 0x17, 0x55, 0xd4, 0x99,
+	0xed, 0x37, 0xe7, 0x92, 0xe2, 0xdb, 0x29, 0x0f, 0xa7, 0x1e, 0xf2, 0xbc, 0x4a, 0x0c, 0xdf, 0x97,
+	0x7d, 0x51, 0x7d, 0x41, 0x7c, 0x04, 0x90, 0xb9, 0xef, 0xe2, 0x0d, 0xae, 0x0a, 0xcd, 0xb8, 0xf3,
+	0x97, 0xa7, 0x64, 0xae, 0x3a, 0x4f, 0xb9, 0xe4, 0xba, 0xcf, 0x4c, 0xf9, 0x0e, 0xb4, 0xf3, 0x6e,
+	0xb7, 0xa0, 0xca, 0xc7, 0x1c, 0x47, 0xbc, 0x38, 0x6d, 0xfd, 0xcf, 0x6a, 0x50, 0xff, 0x81, 0x1f,
+	0x9e, 0xca, 0x50, 0xdc, 0x81, 0x3a, 0xd5, 0xf7, 0x94, 0x60, 0xa4, 0xb5, 0xbe, 0x79, 0xb4, 0x7b,
+	0x17, 0x34, 0x7a, 0xe6, 0x91, 0x19, 0x9d, 0x32, 0xf3, 0xd1, 0xbf, 0x43, 0x78, 0x71, 0x4e, 0xc6,
+	0x11, 0xa7, 0x76, 0x99, 0xf5, 0xd2, 0xfa, 0x77, 0xa1, 0xfe, 0xb6, 0x44, 0x4f, 0xfa, 0xf8, 0xf9,
+	0x10, 0x85, 0xed, 0x41, 0x09, 0xed, 0xf7, 0x90, 0x1f, 0x0f, 0x07, 0x65, 0x5f, 0xc5, 0xb3, 0x2c,
+	0x67, 0x9f, 0xa1, 0xeb, 0x0b, 0xe2, 0x3e, 0xd4, 0x95, 0x3a, 0x5f, 0xcc, 0x94, 0x4e, 0x72, 0xc3,
+	0x5e, 0x1e, 0xa5, 0x26, 0x7c, 0x04, 0x75, 0x36, 0x7d, 0x3c, 0xa1, 0xe0, 0xf7, 0x2f, 0x89, 0x3c,
+	0x2a, 0x11, 0x4f, 0x71, 0x17, 0x1a, 0xaa, 0x7a, 0x27, 0xe6, 0x94, 0xf2, 0x2e, 0xbd, 0x58, 0x9d,
+	0xfd, 0x1a, 0x5e, 0xbf, 0xe0, 0x1a, 0xf2, 0xfa, 0x45, 0xb7, 0x87, 0xe5, 0xd8, 0x90, 0x96, 0x74,
+	0x72, 0x39, 0x20, 0x91, 0x50, 0x64, 0x8e, 0x32, 0xfa, 0x18, 0x3a, 0x85, 0x7c, 0x91, 0xe8, 0x27,
+	0x6c, 0x31, 0x9b, 0x42, 0xba, 0xa4, 0x02, 0xbe, 0x07, 0x9a, 0x0a, 0xc1, 0x0f, 0x15, 0x63, 0xcc,
+	0x09, 0xf8, 0x97, 0x2e, 0xc7, 0xe0, 0x24, 0xd7, 0x3f, 0x84, 0xab, 0x73, 0xec, 0x98, 0xa0, 0xaf,
+	0x2f, 0x5f, 0x6c, 0xa8, 0x97, 0x96, 0x5f, 0xd8, 0x9f, 0x12, 0xe0, 0x1b, 0x89, 0xd3, 0x66, 0xff,
+	0xef, 0xbe, 0xbc, 0x59, 0xfa, 0xf5, 0x97, 0x37, 0x4b, 0xff, 0xf6, 0xe5, 0xcd, 0xd2, 0xaf, 0x7e,
+	0x73, 0x73, 0xe1, 0xd7, 0xbf, 0xb9, 0xb9, 0xf0, 0x8f, 0xbf, 0xb9, 0xb9, 0x70, 0x58, 0xa7, 0xff,
+	0x59, 0x3d, 0xfc, 0xef, 0x00, 0x00, 0x00, 0xff, 0xff, 0x28, 0x9e, 0x2b, 0x96, 0xdd, 0x35, 0x00,
+	0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -10800,6 +10813,16 @@ func (m *BackupRequest) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
+	if m.ForceFull {
+		i--
+		if m.ForceFull {
+			dAtA[i] = 1
+		} else {
+			dAtA[i] = 0
+		}
+		i--
+		dAtA[i] = 0x58
+	}
 	if len(m.Predicates) > 0 {
 		for iNdEx := len(m.Predicates) - 1; iNdEx >= 0; iNdEx-- {
 			i -= len(m.Predicates[iNdEx])
@@ -13049,6 +13072,9 @@ func (m *BackupRequest) Size() (n int) {
 			n += 1 + l + sovPb(uint64(l))
 		}
 	}
+	if m.ForceFull {
+		n += 2
+	}
 	return n
 }
 
@@ -24048,6 +24074,26 @@ func (m *BackupRequest) Unmarshal(dAtA []byte) error {
 			}
 			m.Predicates = append(m.Predicates, string(dAtA[iNdEx:postIndex]))
 			iNdEx = postIndex
+		case 11:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field ForceFull", wireType)
+			}
+			var v int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowPb
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				v |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			m.ForceFull = bool(v != 0)
 		default:
 			iNdEx = preIndex
 			skippy, err := skipPb(dAtA[iNdEx:])
diff --git a/systest/backup/encryption/backup_test.go b/systest/backup/encryption/backup_test.go
index 9117d8f2205..19c9653d781 100644
--- a/systest/backup/encryption/backup_test.go
+++ b/systest/backup/encryption/backup_test.go
@@ -264,8 +264,8 @@ func runBackupInternal(t *testing.T, forceFull bool, numExpectedFiles,
 		backup(input: {destination: $dst, forceFull: $ff}) {
 			response {
 				code
-				message
 			}
+			taskId
 		}
 	}`
 
@@ -282,9 +282,13 @@ func runBackupInternal(t *testing.T, forceFull bool, numExpectedFiles,
 	client := testutil.GetHttpsClient(t)
 	resp, err := client.Post(adminUrl, "application/json", bytes.NewBuffer(b))
 	require.NoError(t, err)
-	buf, err := ioutil.ReadAll(resp.Body)
-	require.NoError(t, err)
-	require.Contains(t, string(buf), "Backup completed.")
+	defer resp.Body.Close()
+
+	var data interface{}
+	require.NoError(t, json.NewDecoder(resp.Body).Decode(&data))
+	require.Equal(t, "Success", testutil.JsonGet(data, "data", "backup", "response", "code").(string))
+	taskId := testutil.JsonGet(data, "data", "backup", "taskId").(string)
+	testutil.WaitForTask(t, taskId, true)
 
 	// Verify that the right amount of files and directories were created.
 	copyToLocalFs(t)
diff --git a/systest/backup/filesystem/backup_test.go b/systest/backup/filesystem/backup_test.go
index b673f9ea71a..57db08c7d67 100644
--- a/systest/backup/filesystem/backup_test.go
+++ b/systest/backup/filesystem/backup_test.go
@@ -372,8 +372,8 @@ func runBackupInternal(t *testing.T, forceFull bool, numExpectedFiles,
 			backup(input: {destination: $dst, forceFull: $ff}) {
 				response {
 					code
-					message
 				}
+				taskId
 			}
 		}`
 
@@ -392,9 +392,12 @@ func runBackupInternal(t *testing.T, forceFull bool, numExpectedFiles,
 	resp, err := client.Post(adminUrl, "application/json", bytes.NewBuffer(b))
 	require.NoError(t, err)
 	defer resp.Body.Close()
-	buf, err := ioutil.ReadAll(resp.Body)
-	require.NoError(t, err)
-	require.Contains(t, string(buf), "Backup completed.")
+
+	var data interface{}
+	require.NoError(t, json.NewDecoder(resp.Body).Decode(&data))
+	require.Equal(t, "Success", testutil.JsonGet(data, "data", "backup", "response", "code").(string))
+	taskId := testutil.JsonGet(data, "data", "backup", "taskId").(string)
+	testutil.WaitForTask(t, taskId, true)
 
 	// Verify that the right amount of files and directories were created.
 	common.CopyToLocalFs(t)
diff --git a/systest/backup/minio-large/backup_test.go b/systest/backup/minio-large/backup_test.go
index 02d13f3d1b6..137daf91c79 100644
--- a/systest/backup/minio-large/backup_test.go
+++ b/systest/backup/minio-large/backup_test.go
@@ -16,11 +16,11 @@
 package main
 
 import (
+	"bytes"
 	"context"
+	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"math"
-	"net/url"
 	"os"
 	"strings"
 	"testing"
@@ -144,17 +144,36 @@ func addTriples(t *testing.T, dg *dgo.Dgraph, numTriples int) {
 }
 
 func runBackup(t *testing.T) {
-	// Using the old /admin/backup endpoint to ensure it works. Change back to using
-	// the GraphQL endpoint at /admin once this endpoint is deprecated.
+	backupRequest := `mutation backup($dst: String!, $ff: Boolean!) {
+		backup(input: {destination: $dst, forceFull: $ff}) {
+			response {
+				code
+			}
+			taskId
+		}
+	}`
+
+	adminUrl := "https://" + testutil.SockAddrHttp + "/admin"
+	params := testutil.GraphQLParams{
+		Query: backupRequest,
+		Variables: map[string]interface{}{
+			"dst": backupDestination,
+			"ff":  false,
+		},
+	}
+	b, err := json.Marshal(params)
+	require.NoError(t, err)
+
 	client := testutil.GetHttpsClient(t)
-	resp, err := client.PostForm("https://"+testutil.SockAddrHttp+"/admin/backup", url.Values{
-		"destination": []string{backupDestination},
-	})
+	resp, err := client.Post(adminUrl, "application/json", bytes.NewBuffer(b))
 	require.NoError(t, err)
 	defer resp.Body.Close()
-	buf, err := ioutil.ReadAll(resp.Body)
-	require.NoError(t, err)
-	require.Contains(t, string(buf), "Backup completed.")
+
+	var data interface{}
+	require.NoError(t, json.NewDecoder(resp.Body).Decode(&data))
+	require.Equal(t, "Success", testutil.JsonGet(data, "data", "backup", "response", "code").(string))
+	taskId := testutil.JsonGet(data, "data", "backup", "taskId").(string)
+	testutil.WaitForTask(t, taskId, true)
 
 	// Verify that the right amount of files and directories were created.
 	copyToLocalFs(t)
diff --git a/systest/backup/minio/backup_test.go b/systest/backup/minio/backup_test.go
index cb7ff3da223..b759dae2ce0 100644
--- a/systest/backup/minio/backup_test.go
+++ b/systest/backup/minio/backup_test.go
@@ -284,8 +284,8 @@ func runBackupInternal(t *testing.T, forceFull bool, numExpectedFiles,
 		backup(input: {destination: $dst, forceFull: $ff}) {
 			response {
 				code
-				message
 			}
+			taskId
 		}
 	}`
 
@@ -303,9 +303,13 @@ func runBackupInternal(t *testing.T, forceFull bool, numExpectedFiles,
 	client := testutil.GetHttpsClient(t)
 	resp, err := client.Post(adminUrl, "application/json", bytes.NewBuffer(b))
 	require.NoError(t, err)
-	buf, err := ioutil.ReadAll(resp.Body)
-	require.NoError(t, err)
-	require.Contains(t, string(buf), "Backup completed.")
+	defer resp.Body.Close()
+
+	var data interface{}
+	require.NoError(t, json.NewDecoder(resp.Body).Decode(&data))
+	require.Equal(t, "Success", testutil.JsonGet(data, "data", "backup", "response", "code").(string))
+	taskId := testutil.JsonGet(data, "data", "backup", "taskId").(string)
+	testutil.WaitForTask(t, taskId, true)
 
 	// Verify that the right amount of files and directories were created.
 	copyToLocalFs(t)
diff --git a/systest/backup/multi-tenancy/backup_test.go b/systest/backup/multi-tenancy/backup_test.go
index 712336a1f34..5ba453ba572 100644
--- a/systest/backup/multi-tenancy/backup_test.go
+++ b/systest/backup/multi-tenancy/backup_test.go
@@ -138,8 +138,8 @@ func runBackupInternal(t *testing.T, token *testutil.HttpToken, forceFull bool,
 			backup(input: {destination: $dst, forceFull: $ff}) {
 				response {
 					code
-					message
 				}
+				taskId
 			}
 		}`
 
@@ -150,16 +150,13 @@ func runBackupInternal(t *testing.T, token *testutil.HttpToken, forceFull bool,
 			"ff":  forceFull,
 		},
 	}
+
 	resp := testutil.MakeRequest(t, token, params)
-	var result struct {
-		Backup struct {
-			Response struct {
-				Message, Code string
-			}
-		}
-	}
-	require.NoError(t, json.Unmarshal(resp.Data, &result))
-	require.Contains(t, result.Backup.Response.Message, "Backup completed.")
+	var data interface{}
+	require.NoError(t, json.Unmarshal(resp.Data, &data))
+	require.Equal(t, "Success", testutil.JsonGet(data, "backup", "response", "code").(string))
+	taskId := testutil.JsonGet(data, "backup", "taskId").(string)
+	testutil.WaitForTask(t, taskId, false)
 
 	// Verify that the right amount of files and directories were created.
 	common.CopyToLocalFs(t)
diff --git a/systest/export/export_test.go b/systest/export/export_test.go
index 15f9d7bc6fd..306fdd0d57f 100644
--- a/systest/export/export_test.go
+++ b/systest/export/export_test.go
@@ -24,6 +24,7 @@ import (
 	"net/http"
 	"os"
 	"path/filepath"
+	"strings"
 	"testing"
 
 	"github.com/dgraph-io/dgo/v210"
@@ -52,20 +53,17 @@ func TestExportSchemaToMinio(t *testing.T) {
 	mc.MakeBucket(bucketName, "")
 
 	setupDgraph(t, moviesData, movieSchema)
-	result := requestExport(t, minioDest, "rdf")
-
-	require.Equal(t, "Success", getFromJSON(result, "data", "export", "response", "code").(string))
-	require.Equal(t, "Export completed.",
-		getFromJSON(result, "data", "export", "response", "message").(string))
-
-	var files []string
-	for _, f := range getFromJSON(result, "data", "export", "exportedFiles").([]interface{}) {
-		files = append(files, f.(string))
+	requestExport(t, minioDest, "rdf")
+
+	schemaFile := ""
+	doneCh := make(chan struct{})
+	defer close(doneCh)
+	for obj := range mc.ListObjectsV2(bucketName, "dgraph.", true, doneCh) {
+		if strings.Contains(obj.Key, ".schema.gz") {
+			schemaFile = obj.Key
+		}
 	}
-	require.Equal(t, 3, len(files))
-
-	schemaFile := files[1]
-	require.Contains(t, schemaFile, ".schema.gz")
+	require.NotEmpty(t, schemaFile)
 
 	object, err := mc.GetObject(bucketName, schemaFile, minio.GetObjectOptions{})
 	require.NoError(t, err)
@@ -113,16 +111,7 @@ func TestExportAndLoadJson(t *testing.T) {
 	setupDgraph(t, moviesData, movieSchema)
 
 	// Run export
-	result := requestExport(t, "/data/export-data", "json")
-	require.Equal(t, "Success", getFromJSON(result, "data", "export", "response", "code").(string))
-	require.Equal(t, "Export completed.",
-		getFromJSON(result, "data", "export", "response", "message").(string))
-
-	var files []string
-	for _, f := range getFromJSON(result, "data", "export", "exportedFiles").([]interface{}) {
-		files = append(files, f.(string))
-	}
-	require.Equal(t, 3, len(files))
+	requestExport(t, "/data/export-data", "json")
 	copyToLocalFs(t)
 
 	q := `{ q(func:has(movie)) { count(uid) } }`
@@ -140,8 +129,11 @@ func TestExportAndLoadJson(t *testing.T) {
 	require.JSONEq(t, `{"data": {"q": [{"count":0}]}}`, res)
 
 	// Live load the exported data
-	base := filepath.Dir(files[0])
-	dir := filepath.Join(copyExportDir, base)
+	files, err := ioutil.ReadDir(copyExportDir)
+	require.NoError(t, err)
+	require.Len(t, files, 1)
+	exportName := files[0].Name()
+	dir := filepath.Join(copyExportDir, exportName)
 	loadData(t, dir, "json")
 
 	res = runQuery(t, q)
@@ -175,16 +167,7 @@ func TestExportAndLoadJsonFacets(t *testing.T) {
 	setupDgraph(t, facetsData, facetsSchema)
 
 	// Run export
-	result := requestExport(t, "/data/export-data", "json")
-	require.Equal(t, "Success", getFromJSON(result, "data", "export", "response", "code").(string))
-	require.Equal(t, "Export completed.",
-		getFromJSON(result, "data", "export", "response", "message").(string))
-
-	var files []string
-	for _, f := range getFromJSON(result, "data", "export", "exportedFiles").([]interface{}) {
-		files = append(files, f.(string))
-	}
-	require.Equal(t, 3, len(files))
+	requestExport(t, "/data/export-data", "json")
 	copyToLocalFs(t)
 
 	checkRes := func() {
@@ -225,8 +208,11 @@ func TestExportAndLoadJsonFacets(t *testing.T) {
 	require.JSONEq(t, `{"data": {"q": []}}`, res)
 
 	// Live load the exported data and verify that exported data is loaded correctly.
-	base := filepath.Dir(files[0])
-	dir := filepath.Join(copyExportDir, base)
+	files, err := ioutil.ReadDir(copyExportDir)
+	require.NoError(t, err)
+	require.Len(t, files, 1)
+	exportName := files[0].Name()
+	dir := filepath.Join(copyExportDir, exportName)
 	loadData(t, dir, "json")
 
 	// verify that the state after loading the exported data as same.
@@ -299,14 +285,13 @@ func setupDgraph(t *testing.T, nquads, schema string) {
 	require.NoError(t, err)
 }
 
-func requestExport(t *testing.T, dest string, format string) map[string]interface{} {
+func requestExport(t *testing.T, dest string, format string) {
 	exportRequest := `mutation export($dst: String!, $f: String!) {
 		export(input: {destination: $dst, format: $f}) {
 			response {
 				code
-				message
 			}
-			exportedFiles
+			taskId
 		}
 	}`
 
@@ -323,19 +308,10 @@ func requestExport(t *testing.T, dest string, format string) map[string]interfac
 
 	resp, err := http.Post(adminUrl, "application/json", bytes.NewBuffer(b))
 	require.NoError(t, err)
-	buf, err := ioutil.ReadAll(resp.Body)
-	require.NoError(t, err)
-
-	var result map[string]interface{}
-	require.NoError(t, json.Unmarshal(buf, &result))
 
-	return result
-}
-
-func getFromJSON(j map[string]interface{}, path ...string) interface{} {
-	var res interface{} = j
-	for _, p := range path {
-		res = res.(map[string]interface{})[p]
-	}
-	return res
+	var data interface{}
+	require.NoError(t, json.NewDecoder(resp.Body).Decode(&data))
+	require.Equal(t, "Success", testutil.JsonGet(data, "data", "export", "response", "code").(string))
+	taskId := testutil.JsonGet(data, "data", "export", "taskId").(string)
+	testutil.WaitForTask(t, taskId, false)
 }
diff --git a/systest/mutations_test.go b/systest/mutations_test.go
index 496e3096bb7..129e70f8083 100644
--- a/systest/mutations_test.go
+++ b/systest/mutations_test.go
@@ -1738,7 +1738,7 @@ func CountIndexConcurrentSetDelUIDList(t *testing.T, c *dgo.Dgraph) {
 					CommitNow: true,
 				}
 
-				mu.SetNquads = []byte(fmt.Sprintf("<0x1> <friend> <0x%x> .", id))
+				mu.SetNquads = []byte(fmt.Sprintf("<0x1> <friend> <%#x> .", id))
 				_, err := dg.NewTxn().Mutate(context.Background(), mu)
 				if err != nil && err != dgo.ErrAborted {
 					require.Fail(t, "unable to inserted uid with err: %s", err)
@@ -1789,7 +1789,7 @@ func CountIndexConcurrentSetDelUIDList(t *testing.T, c *dgo.Dgraph) {
 					CommitNow: true,
 				}
 
-				mu.DelNquads = []byte(fmt.Sprintf("<0x1> <friend> <0x%x> .", id))
+				mu.DelNquads = []byte(fmt.Sprintf("<0x1> <friend> <%#x> .", id))
 				_, err := dg.NewTxn().Mutate(context.Background(), mu)
 				if err != nil && err != dgo.ErrAborted {
 					require.Fail(t, "unable to delete uid with err: %s", err)
diff --git a/testutil/backup.go b/testutil/backup.go
index 6fe3ba669df..f1e9f904eb0 100644
--- a/testutil/backup.go
+++ b/testutil/backup.go
@@ -90,7 +90,7 @@ func WaitForRestore(t *testing.T, dg *dgo.Dgraph) {
 	   }}`)
 
 		if err == nil {
-			numSuccess += 1
+			numSuccess++
 		} else {
 			require.Contains(t, err.Error(), "the server is in draining mode")
 			numSuccess = 0
diff --git a/testutil/utils.go b/testutil/utils.go
index b88aae972f4..e36bb174e5a 100644
--- a/testutil/utils.go
+++ b/testutil/utils.go
@@ -16,7 +16,17 @@
 
 package testutil
 
-import "github.com/dgraph-io/dgraph/x"
+import (
+	"bytes"
+	"encoding/json"
+	"log"
+	"net/http"
+	"testing"
+	"time"
+
+	"github.com/dgraph-io/dgraph/x"
+	"github.com/stretchr/testify/require"
+)
 
 func GalaxySchemaKey(attr string) []byte {
 	attr = x.GalaxyAttr(attr)
@@ -47,3 +57,52 @@ func GalaxyCountKey(attr string, count uint32, reverse bool) []byte {
 	attr = x.GalaxyAttr(attr)
 	return x.CountKey(attr, count, reverse)
 }
+
+func WaitForTask(t *testing.T, taskId string, useHttps bool) {
+	const query = `query task($id: String!) {
+		task(input: {id: $id}) {
+			status
+		}
+	}`
+	params := GraphQLParams{
+		Query:     query,
+		Variables: map[string]interface{}{"id": taskId},
+	}
+	request, err := json.Marshal(params)
+	require.NoError(t, err)
+
+	for {
+		var adminUrl string
+		var client http.Client
+		if useHttps {
+			adminUrl = "https://" + SockAddrHttp + "/admin"
+			client = GetHttpsClient(t)
+		} else {
+			adminUrl = "http://" + SockAddrHttp + "/admin"
+			client = *http.DefaultClient
+		}
+		response, err := client.Post(adminUrl, "application/json", bytes.NewBuffer(request))
+		require.NoError(t, err)
+		defer response.Body.Close()
+
+		var data interface{}
+		require.NoError(t, json.NewDecoder(response.Body).Decode(&data))
+		status := JsonGet(data, "data", "task", "status").(string)
+		switch status {
+		case "Success":
+			log.Printf("export complete")
+			return
+		case "Failed", "Unknown":
+			t.Errorf("task failed with status: %s", status)
+		}
+
+		time.Sleep(4 * time.Second)
+	}
+}
+
+func JsonGet(j interface{}, components ...string) interface{} {
+	for _, component := range components {
+		j = j.(map[string]interface{})[component]
+	}
+	return j
+}
diff --git a/worker/backup_ee.go b/worker/backup_ee.go
index c1aed1c6461..eb2d5836480 100644
--- a/worker/backup_ee.go
+++ b/worker/backup_ee.go
@@ -108,16 +108,7 @@ type BackupRes struct {
 	err error
 }
 
-func ProcessBackupRequest(ctx context.Context, req *pb.BackupRequest, forceFull bool) error {
-	if !EnterpriseEnabled() {
-		return errors.New("you must enable enterprise features first. " +
-			"Supply the appropriate license file to Dgraph Zero using the HTTP endpoint.")
-	}
-
-	if req.Destination == "" {
-		return errors.Errorf("you must specify a 'destination' value")
-	}
-
+func ProcessBackupRequest(ctx context.Context, req *pb.BackupRequest) error {
 	if err := x.HealthCheck(); err != nil {
 		glog.Errorf("Backup canceled, not ready to accept requests: %s", err)
 		return err
@@ -160,11 +151,8 @@ func ProcessBackupRequest(ctx context.Context, req *pb.BackupRequest, forceFull
 		return err
 	}
 
-	// Use the readTs as the sinceTs for the next backup. If not found, use the
-	// SinceTsDeprecated value from the latest manifest.
 	req.SinceTs = latestManifest.ValidReadTs()
-	if forceFull {
-		// To force a full backup we'll set the sinceTs to zero.
+	if req.ForceFull {
 		req.SinceTs = 0
 	} else {
 		if x.WorkerConfig.EncryptionKey != nil {
diff --git a/worker/backup_oss.go b/worker/backup_oss.go
index c7d4b09d740..1472b902809 100644
--- a/worker/backup_oss.go
+++ b/worker/backup_oss.go
@@ -34,7 +34,7 @@ func (w *grpcWorker) Backup(
 	return nil, x.ErrNotSupported
 }
 
-func ProcessBackupRequest(ctx context.Context, req *pb.BackupRequest, forceFull bool) error {
+func ProcessBackupRequest(ctx context.Context, req *pb.BackupRequest) error {
 	glog.Warningf("Backup failed: %v", x.ErrNotSupported)
 	return x.ErrNotSupported
 }
diff --git a/worker/export.go b/worker/export.go
index a6bc99034ed..7d5c96629ff 100644
--- a/worker/export.go
+++ b/worker/export.go
@@ -337,7 +337,7 @@ func toSchema(attr string, update *pb.SchemaUpdate) *bpb.KV {
 func toType(attr string, update pb.TypeUpdate) *bpb.KV {
 	var buf bytes.Buffer
 	ns, attr := x.ParseNamespaceAttr(attr)
-	x.Check2(buf.WriteString(fmt.Sprintf("[0x%x] type <%s> {\n", ns, attr)))
+	x.Check2(buf.WriteString(fmt.Sprintf("[%#x] type <%s> {\n", ns, attr)))
 	for _, field := range update.Fields {
 		x.Check2(buf.WriteString(fieldToString(field)))
 	}
diff --git a/worker/queue.go b/worker/queue.go
new file mode 100644
index 00000000000..1f0b28e3a28
--- /dev/null
+++ b/worker/queue.go
@@ -0,0 +1,357 @@
+/*
+ * Copyright 2021 Dgraph Labs, Inc. and Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package worker
+
+import (
+	"context"
+	"fmt"
+	"math"
+	"math/rand"
+	"path/filepath"
+	"reflect"
+	"strconv"
+	"sync"
+	"time"
+
+	"github.com/dgraph-io/dgraph/protos/pb"
+	"github.com/dgraph-io/dgraph/raftwal"
+	"github.com/dgraph-io/dgraph/x"
+	"github.com/dgraph-io/ristretto/z"
+	"github.com/golang/glog"
+	"github.com/pkg/errors"
+)
+
+var (
+	// Tasks is a global persistent task queue.
+	// Do not use this before calling InitTasks.
+	Tasks tasks
+)
+
+// InitTasks initializes the global Tasks variable.
+func InitTasks() {
+	path := filepath.Join(x.WorkerConfig.TmpDir, "tasks.buf")
+	log, err := z.NewTreePersistent(path)
+	x.Check(err)
+
+	// #nosec G404: weak RNG
+	Tasks = tasks{
+		queue:  make(chan taskRequest, 16),
+		log:    log,
+		logMu:  new(sync.Mutex),
+		raftId: State.WALstore.Uint(raftwal.RaftId),
+		rng:    rand.New(rand.NewSource(time.Now().UnixNano())),
+	}
+
+	// Mark all pending tasks as failed.
+	Tasks.logMu.Lock()
+	Tasks.log.IterateKV(func(id, val uint64) uint64 {
+		meta := TaskMeta(val)
+		if status := meta.Status(); status == TaskStatusQueued || status == TaskStatusRunning {
+			return uint64(newTaskMeta(meta.Kind(), TaskStatusFailed))
+		}
+		return 0
+	})
+	Tasks.logMu.Unlock()
+
+	// Start the task runner.
+	go Tasks.worker()
+}
+
+// tasks is a persistent task queue.
+type tasks struct {
+	// queue stores the full Protobuf request.
+	queue chan taskRequest
+	// log stores the timestamp, TaskKind, and TaskStatus.
+	log   *z.Tree
+	logMu *sync.Mutex
+
+	raftId uint64
+	rng    *rand.Rand
+}
+
+// Get retrieves metadata for a given task ID.
+// It returns 0 if the task was not found.
+func (t tasks) Get(id string) (TaskMeta, error) {
+	idUint64, err := strconv.ParseUint(id, 0, 64)
+	if err != nil {
+		return 0, errors.Wrapf(err, "task ID is invalid: %s", id)
+	}
+	if idUint64 == 0 || idUint64 == math.MaxUint64 {
+		return 0, fmt.Errorf("task ID is invalid: %d", idUint64)
+	}
+	t.logMu.Lock()
+	defer t.logMu.Unlock()
+	meta := TaskMeta(t.log.Get(idUint64))
+	if meta == 0 {
+		return 0, fmt.Errorf("task does not exist or has expired")
+	}
+	return meta, nil
+}
+
+// cleanup deletes all expired tasks.
+func (t tasks) cleanup() {
+	const taskTtl = 7 * 24 * time.Hour // 1 week
+	minTs := time.Now().UTC().Add(-taskTtl).Unix()
+	minMeta := uint64(minTs) << 32
+
+	t.logMu.Lock()
+	defer t.logMu.Unlock()
+	t.log.DeleteBelow(minMeta)
+}
+
+// worker loops forever, running queued tasks one at a time. Any returned errors are logged.
+func (t tasks) worker() {
+	shouldCleanup := time.NewTicker(time.Hour)
+	defer shouldCleanup.Stop()
+	for {
+		// If the server is shutting down, return immediately. Else, fetch a task from the queue.
+		var task taskRequest
+		select {
+		case <-x.ServerCloser.HasBeenClosed():
+			t.log.Close()
+			return
+		case <-shouldCleanup.C:
+			t.cleanup()
+		case task = <-t.queue:
+			if err := t.run(task); err != nil {
+				glog.Errorf("task %#x: failed: %s", task.id, err)
+			} else {
+				glog.Infof("task %#x: completed successfully", task.id)
+			}
+		}
+	}
+}
+
+func (t tasks) run(task taskRequest) error {
+	// Fetch the task from the log. If the task isn't found, this means it has expired (older than
+	// taskTtl).
+	t.logMu.Lock()
+	meta := TaskMeta(t.log.Get(task.id))
+	t.logMu.Unlock()
+	if meta == 0 {
+		return fmt.Errorf("is expired, skipping")
+	}
+
+	// Only proceed if the task is still queued. It's possible that the task got canceled before we
+	// were able to run it.
+	if status := meta.Status(); status != TaskStatusQueued {
+		return fmt.Errorf("status is set to %s, skipping", status)
+	}
+
+	// Change the task status to Running.
+	t.logMu.Lock()
+	t.log.Set(task.id, newTaskMeta(meta.Kind(), TaskStatusRunning).uint64())
+	t.logMu.Unlock()
+
+	// Run the task.
+	var status TaskStatus
+	err := task.run()
+	if err != nil {
+		status = TaskStatusFailed
+	} else {
+		status = TaskStatusSuccess
+	}
+
+	// Change the task status to Success / Failed.
+	t.logMu.Lock()
+	t.log.Set(task.id, newTaskMeta(meta.Kind(), status).uint64())
+	t.logMu.Unlock()
+
+	// Return the error from the task.
+	return err
+}
+
+// Enqueue adds a new task to the queue, waits for 3 seconds, and returns any errors that
+// may have happened in that span of time. The request must be of type:
+// - *pb.BackupRequest
+// - *pb.ExportRequest
+func (t tasks) Enqueue(req interface{}) (string, error) {
+	id, err := t.enqueue(req)
+	if err != nil {
+		return "", err
+	}
+	taskId := fmt.Sprintf("%#x", id)
+
+	// Wait for upto 3 seconds to check for errors.
+	for i := 0; i < 3; i++ {
+		time.Sleep(time.Second)
+
+		t.logMu.Lock()
+		meta := TaskMeta(t.log.Get(id))
+		t.logMu.Unlock()
+
+		// Early return
+		switch meta.Status() {
+		case TaskStatusFailed:
+			return "", fmt.Errorf("an error occurred, please check logs for details")
+		case TaskStatusSuccess:
+			return taskId, nil
+		}
+	}
+
+	return taskId, nil
+}
+
+// enqueue adds a new task to the queue. This must be of type:
+// - *pb.BackupRequest
+// - *pb.ExportRequest
+func (t tasks) enqueue(req interface{}) (uint64, error) {
+	var kind TaskKind
+	switch req.(type) {
+	case *pb.BackupRequest:
+		kind = TaskKindBackup
+	case *pb.ExportRequest:
+		kind = TaskKindExport
+	default:
+		err := fmt.Errorf("invalid TaskKind: %d", kind)
+		panic(err)
+	}
+
+	t.logMu.Lock()
+	defer t.logMu.Unlock()
+
+	task := taskRequest{
+		id:  t.newId(),
+		req: req,
+	}
+	select {
+	// t.logMu must be acquired before pushing to t.queue, otherwise the worker might start the
+	// task, and won't be able to find it in t.log.
+	case t.queue <- task:
+		t.log.Set(task.id, newTaskMeta(kind, TaskStatusQueued).uint64())
+		return task.id, nil
+	default:
+		return 0, fmt.Errorf("too many pending tasks, please try again later")
+	}
+}
+
+// newId generates a random unique task ID. logMu must be acquired before calling this function.
+//
+// The format of this is:
+// 32 bits: raft ID
+// 32 bits: random number
+func (t tasks) newId() uint64 {
+	for {
+		id := t.raftId<<32 | uint64(t.rng.Int())
+		// z.Tree cannot store 0 or math.MaxUint64. Check that id is unique.
+		if id != 0 && id != math.MaxUint64 && t.log.Get(id) == 0 {
+			return id
+		}
+	}
+}
+
+type taskRequest struct {
+	id  uint64
+	req interface{} // *pb.BackupRequest, *pb.ExportRequest
+}
+
+// run starts a task and blocks till it completes.
+func (t taskRequest) run() error {
+	switch req := t.req.(type) {
+	case *pb.BackupRequest:
+		if err := ProcessBackupRequest(context.Background(), req); err != nil {
+			return err
+		}
+	case *pb.ExportRequest:
+		files, err := ExportOverNetwork(context.Background(), req)
+		if err != nil {
+			return err
+		}
+		glog.Infof("task %#x: exported files: %v", t.id, files)
+	default:
+		glog.Errorf(
+			"task %#x: received request of unknown type (%T)", t.id, reflect.TypeOf(t.req))
+	}
+	return nil
+}
+
+// TaskMeta stores a timestamp, a TaskKind and a Status.
+//
+// The format of this is:
+// 32 bits: UNIX timestamp (overflows on 2106-02-07)
+// 16 bits: TaskKind
+// 16 bits: TaskStatus
+type TaskMeta uint64
+
+func newTaskMeta(kind TaskKind, status TaskStatus) TaskMeta {
+	now := time.Now().UTC().Unix()
+	return TaskMeta(now)<<32 | TaskMeta(kind)<<16 | TaskMeta(status)
+}
+
+// Timestamp returns the timestamp of the last status change of the task.
+func (t TaskMeta) Timestamp() time.Time {
+	return time.Unix(int64(t>>32), 0)
+}
+
+// Kind returns the type of the task.
+func (t TaskMeta) Kind() TaskKind {
+	return TaskKind((t >> 16) & math.MaxUint16)
+}
+
+// Status returns the current status of the task.
+func (t TaskMeta) Status() TaskStatus {
+	return TaskStatus(t & math.MaxUint16)
+}
+
+// uint64 represents the TaskMeta as a uint64.
+func (t TaskMeta) uint64() uint64 {
+	return uint64(t)
+}
+
+const (
+	// Reserve the zero value for errors.
+	TaskKindBackup TaskKind = iota + 1
+	TaskKindExport
+)
+
+type TaskKind uint64
+
+func (k TaskKind) String() string {
+	switch k {
+	case TaskKindBackup:
+		return "Backup"
+	case TaskKindExport:
+		return "Export"
+	default:
+		return "Unknown"
+	}
+}
+
+const (
+	// Reserve the zero value for errors.
+	TaskStatusQueued TaskStatus = iota + 1
+	TaskStatusRunning
+	TaskStatusFailed
+	TaskStatusSuccess
+)
+
+type TaskStatus uint64
+
+func (status TaskStatus) String() string {
+	switch status {
+	case TaskStatusQueued:
+		return "Queued"
+	case TaskStatusRunning:
+		return "Running"
+	case TaskStatusFailed:
+		return "Failed"
+	case TaskStatusSuccess:
+		return "Success"
+	default:
+		return "Unknown"
+	}
+}
diff --git a/worker/worker_test.go b/worker/worker_test.go
index 207d11ad9dd..13a7c4ac000 100644
--- a/worker/worker_test.go
+++ b/worker/worker_test.go
@@ -141,13 +141,13 @@ func populateGraph(t *testing.T) {
 func populateClusterGraph(t *testing.T, dg *dgo.Dgraph) {
 	data1 := [][]int{{10, 23}, {11, 23}, {12, 23}, {12, 25}, {12, 26}, {10, 31}, {12, 31}}
 	for _, pair := range data1 {
-		rdf := fmt.Sprintf(`<0x%x> <neighbour> <0x%x> .`, pair[0], pair[1])
+		rdf := fmt.Sprintf(`<%#x> <neighbour> <%#x> .`, pair[0], pair[1])
 		setClusterEdge(t, dg, rdf)
 	}
 
 	data2 := map[int]string{12: "photon", 10: "photon"}
 	for key, val := range data2 {
-		rdf := fmt.Sprintf(`<0x%x> <friend> %q .`, key, val)
+		rdf := fmt.Sprintf(`<%#x> <friend> %q .`, key, val)
 		setClusterEdge(t, dg, rdf)
 	}
 }
@@ -211,7 +211,7 @@ func runQuery(dg *dgo.Dgraph, attr string, uids []uint64, srcFunc []string) (*ap
 	if uids != nil {
 		var uidv []string
 		for _, uid := range uids {
-			uidv = append(uidv, fmt.Sprintf("0x%x", uid))
+			uidv = append(uidv, fmt.Sprintf("%#x", uid))
 		}
 		query = fmt.Sprintf(`
 			{
@@ -258,8 +258,8 @@ func TestProcessTaskIndexMLayer(t *testing.T) {
 
 	// Now try changing 12's friend value from "photon" to "notphotonExtra" to
 	// "notphoton".
-	setClusterEdge(t, dg, fmt.Sprintf("<0x%x> <friend> %q .", 12, "notphotonExtra"))
-	setClusterEdge(t, dg, fmt.Sprintf("<0x%x> <friend> %q .", 12, "notphoton"))
+	setClusterEdge(t, dg, fmt.Sprintf("<%#x> <friend> %q .", 12, "notphotonExtra"))
+	setClusterEdge(t, dg, fmt.Sprintf("<%#x> <friend> %q .", 12, "notphoton"))
 
 	// Issue a similar query.
 	resp, err = runQuery(dg, "friend", nil,
@@ -275,12 +275,12 @@ func TestProcessTaskIndexMLayer(t *testing.T) {
 	)
 
 	// Try redundant deletes.
-	delClusterEdge(t, dg, fmt.Sprintf("<0x%x> <friend> %q .", 10, "photon"))
-	delClusterEdge(t, dg, fmt.Sprintf("<0x%x> <friend> %q .", 10, "photon"))
+	delClusterEdge(t, dg, fmt.Sprintf("<%#x> <friend> %q .", 10, "photon"))
+	delClusterEdge(t, dg, fmt.Sprintf("<%#x> <friend> %q .", 10, "photon"))
 
 	// Delete followed by set.
-	delClusterEdge(t, dg, fmt.Sprintf("<0x%x> <friend> %q .", 12, "notphoton"))
-	setClusterEdge(t, dg, fmt.Sprintf("<0x%x> <friend> %q .", 12, "ignored"))
+	delClusterEdge(t, dg, fmt.Sprintf("<%#x> <friend> %q .", 12, "notphoton"))
+	setClusterEdge(t, dg, fmt.Sprintf("<%#x> <friend> %q .", 12, "ignored"))
 
 	// Issue a similar query.
 	resp, err = runQuery(dg, "friend", nil,
@@ -324,8 +324,8 @@ func TestProcessTaskIndex(t *testing.T) {
 
 	// Now try changing 12's friend value from "photon" to "notphotonExtra" to
 	// "notphoton".
-	setClusterEdge(t, dg, fmt.Sprintf("<0x%x> <friend> %q .", 12, "notphotonExtra"))
-	setClusterEdge(t, dg, fmt.Sprintf("<0x%x> <friend> %q .", 12, "notphoton"))
+	setClusterEdge(t, dg, fmt.Sprintf("<%#x> <friend> %q .", 12, "notphotonExtra"))
+	setClusterEdge(t, dg, fmt.Sprintf("<%#x> <friend> %q .", 12, "notphoton"))
 
 	// Issue a similar query.
 	resp, err = runQuery(dg, "friend", nil,
@@ -341,12 +341,12 @@ func TestProcessTaskIndex(t *testing.T) {
 	)
 
 	// Try redundant deletes.
-	delClusterEdge(t, dg, fmt.Sprintf("<0x%x> <friend> %q .", 10, "photon"))
-	delClusterEdge(t, dg, fmt.Sprintf("<0x%x> <friend> %q .", 10, "photon"))
+	delClusterEdge(t, dg, fmt.Sprintf("<%#x> <friend> %q .", 10, "photon"))
+	delClusterEdge(t, dg, fmt.Sprintf("<%#x> <friend> %q .", 10, "photon"))
 
 	// Delete followed by set.
-	delClusterEdge(t, dg, fmt.Sprintf("<0x%x> <friend> %q .", 12, "notphoton"))
-	setClusterEdge(t, dg, fmt.Sprintf("<0x%x> <friend> %q .", 12, "ignored"))
+	delClusterEdge(t, dg, fmt.Sprintf("<%#x> <friend> %q .", 12, "notphoton"))
+	setClusterEdge(t, dg, fmt.Sprintf("<%#x> <friend> %q .", 12, "ignored"))
 
 	// Issue a similar query.
 	resp, err = runQuery(dg, "friend", nil,

From 88ab63357e013812b42010301f87900860f21959 Mon Sep 17 00:00:00 2001
From: Ajeet D'Souza <98ajeet@gmail.com>
Date: Wed, 28 Apr 2021 18:09:29 +0530
Subject: [PATCH 3/5] Update Ristretto to bring in new Buffer and Tree API
 (#7747)

---
 dgraph/cmd/bulk/mapper.go | 6 +++---
 dgraph/cmd/bulk/reduce.go | 8 +++-----
 dgraph/cmd/zero/oracle.go | 5 +++--
 dgraph/cmd/zero/run.go    | 2 +-
 go.mod                    | 2 +-
 go.sum                    | 4 ++--
 worker/backup_ee.go       | 6 +++---
 worker/predicate_move.go  | 4 ++--
 worker/restore_map.go     | 4 ++--
 worker/restore_reduce.go  | 5 +----
 worker/snapshot.go        | 2 +-
 xidmap/trie.go            | 4 +---
 xidmap/xidmap.go          | 5 ++++-
 13 files changed, 27 insertions(+), 30 deletions(-)

diff --git a/dgraph/cmd/bulk/mapper.go b/dgraph/cmd/bulk/mapper.go
index 442bbe027c9..604c05080ce 100644
--- a/dgraph/cmd/bulk/mapper.go
+++ b/dgraph/cmd/bulk/mapper.go
@@ -57,10 +57,10 @@ type shardState struct {
 
 func newMapperBuffer(opt *options) *z.Buffer {
 	sz := float64(opt.MapBufSize) * 1.1
-	buf, err := z.NewBufferWithDir(int(sz), 2*int(opt.MapBufSize), z.UseMmap,
-		filepath.Join(opt.TmpDir, bufferDir), "Mapper.Buffer")
+	tmpDir := filepath.Join(opt.TmpDir, bufferDir)
+	buf, err := z.NewBufferTmp(tmpDir, int(sz))
 	x.Check(err)
-	return buf
+	return buf.WithMaxSize(2 * int(opt.MapBufSize))
 }
 
 func newMapper(st *state) *mapper {
diff --git a/dgraph/cmd/bulk/reduce.go b/dgraph/cmd/bulk/reduce.go
index 6bc714633c9..a898149fd27 100644
--- a/dgraph/cmd/bulk/reduce.go
+++ b/dgraph/cmd/bulk/reduce.go
@@ -434,11 +434,9 @@ func bufferStats(cbuf *z.Buffer) {
 }
 
 func getBuf(dir string) *z.Buffer {
-	cbuf, err := z.NewBufferWithDir(64<<20, 64<<30, z.UseCalloc,
-		filepath.Join(dir, bufferDir), "Reducer.GetBuf")
-	x.Check(err)
-	cbuf.AutoMmapAfter(1 << 30)
-	return cbuf
+	return z.NewBuffer(64<<20, "Reducer.GetBuf").
+		WithAutoMmap(1<<30, filepath.Join(dir, bufferDir)).
+		WithMaxSize(64 << 30)
 }
 
 func (r *reducer) reduce(partitionKeys [][]byte, mapItrs []*mapIterator, ci *countIndexer) {
diff --git a/dgraph/cmd/zero/oracle.go b/dgraph/cmd/zero/oracle.go
index c1c0b424437..4df2de2af37 100644
--- a/dgraph/cmd/zero/oracle.go
+++ b/dgraph/cmd/zero/oracle.go
@@ -59,15 +59,16 @@ func (o *Oracle) Init() {
 	o.commits = make(map[uint64]uint64)
 	// Remove the older btree file, before creating NewTree, as it may contain stale data leading
 	// to wrong results.
-	o.keyCommit = z.NewTree()
+	o.keyCommit = z.NewTree("oracle")
 	o.subscribers = make(map[int]chan pb.OracleDelta)
 	o.updates = make(chan *pb.OracleDelta, 100000) // Keeping 1 second worth of updates.
 	o.doneUntil.Init(nil)
 	go o.sendDeltasToSubscribers()
 }
 
-// oracle close releases the memory associated with btree used for keycommit.
+// close releases the memory associated with btree used for keycommit.
 func (o *Oracle) close() {
+	o.keyCommit.Close()
 }
 
 func (o *Oracle) updateStartTxnTs(ts uint64) {
diff --git a/dgraph/cmd/zero/run.go b/dgraph/cmd/zero/run.go
index 4d72952c8f8..0bdd3a9974b 100644
--- a/dgraph/cmd/zero/run.go
+++ b/dgraph/cmd/zero/run.go
@@ -127,7 +127,7 @@ instances to achieve high-availability.
 		Head("Audit options").
 		Flag("output",
 			`[stdout, /path/to/dir] This specifies where audit logs should be output to.
-			"stdout" is for standard output. You can also specify the directory where audit logs 
+			"stdout" is for standard output. You can also specify the directory where audit logs
 			will be saved. When stdout is specified as output other fields will be ignored.`).
 		Flag("compress",
 			"Enables the compression of old audit logs.").
diff --git a/go.mod b/go.mod
index 0855dcc4e0d..851fd6203fa 100644
--- a/go.mod
+++ b/go.mod
@@ -19,7 +19,7 @@ require (
 	github.com/dgraph-io/gqlgen v0.13.2
 	github.com/dgraph-io/gqlparser/v2 v2.2.0
 	github.com/dgraph-io/graphql-transport-ws v0.0.0-20210223074046-e5b8b80bb4ed
-	github.com/dgraph-io/ristretto v0.0.4-0.20210430144708-642987276d6a
+	github.com/dgraph-io/ristretto v0.0.4-0.20210428103110-8405ab9b246f
 	github.com/dgraph-io/simdjson-go v0.3.0
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
 	github.com/dgrijalva/jwt-go/v4 v4.0.0-preview1
diff --git a/go.sum b/go.sum
index ebc2835dca7..2a08b2004cf 100644
--- a/go.sum
+++ b/go.sum
@@ -131,8 +131,8 @@ github.com/dgraph-io/gqlparser/v2 v2.2.0/go.mod h1:MYS4jppjyx8b9tuUtjV7jU1UFZK6P
 github.com/dgraph-io/graphql-transport-ws v0.0.0-20210223074046-e5b8b80bb4ed h1:pgGMBoTtFhR+xkyzINaToLYRurHn+6pxMYffIGmmEPc=
 github.com/dgraph-io/graphql-transport-ws v0.0.0-20210223074046-e5b8b80bb4ed/go.mod h1:7z3c/5w0sMYYZF5bHsrh8IH4fKwG5O5Y70cPH1ZLLRQ=
 github.com/dgraph-io/ristretto v0.0.4-0.20210309073149-3836124cdc5a/go.mod h1:MIonLggsKgZLUSt414ExgwNtlOL5MuEoAJP514mwGe8=
-github.com/dgraph-io/ristretto v0.0.4-0.20210430144708-642987276d6a h1:www55JYSP8aYgBPNWJLeMS/HJMba6emZyBF65/a4XRI=
-github.com/dgraph-io/ristretto v0.0.4-0.20210430144708-642987276d6a/go.mod h1:fux0lOrBhrVCJd3lcTHsIJhq1T2rokOu6v9Vcb3Q9ug=
+github.com/dgraph-io/ristretto v0.0.4-0.20210428103110-8405ab9b246f h1:vupa/2tdIvqUTP0Md7MMvdKwCQjF48m+T6LZRVc+3cg=
+github.com/dgraph-io/ristretto v0.0.4-0.20210428103110-8405ab9b246f/go.mod h1:fux0lOrBhrVCJd3lcTHsIJhq1T2rokOu6v9Vcb3Q9ug=
 github.com/dgraph-io/simdjson-go v0.3.0 h1:h71LO7vR4LHMPUhuoGN8bqGm1VNfGOlAG8BI6iDUKw0=
 github.com/dgraph-io/simdjson-go v0.3.0/go.mod h1:Otpysdjaxj9OGaJusn4pgQV7OFh2bELuHANq0I78uvY=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumCAMpl/TFQ4/5kLM=
diff --git a/worker/backup_ee.go b/worker/backup_ee.go
index eb2d5836480..52455b52bce 100644
--- a/worker/backup_ee.go
+++ b/worker/backup_ee.go
@@ -294,9 +294,9 @@ func NewBackupProcessor(db *badger.DB, req *pb.BackupRequest) *BackupProcessor {
 		bp.txn = db.NewTransactionAt(req.ReadTs, false)
 	}
 	for i := range bp.threads {
-		buf, err := z.NewBufferWith(32<<20, 32<<30, z.UseCalloc, "Worker.BackupProcessor")
-		x.Check(err)
-		buf.AutoMmapAfter(1 << 30)
+		buf := z.NewBuffer(32<<20, "Worker.BackupProcessor").
+			WithAutoMmap(1<<30, "").
+			WithMaxSize(32 << 30)
 
 		bp.threads[i] = &threadLocal{
 			Request: bp.Request,
diff --git a/worker/predicate_move.go b/worker/predicate_move.go
index b5437d43e72..38caaa54ebf 100644
--- a/worker/predicate_move.go
+++ b/worker/predicate_move.go
@@ -71,7 +71,7 @@ func batchAndProposeKeyValues(ctx context.Context, kvs chan *pb.KVS) error {
 	var pk x.ParsedKey
 
 	for kvPayload := range kvs {
-		buf := z.BufferFrom(kvPayload.GetData())
+		buf := z.NewBufferSlice(kvPayload.GetData())
 		err := buf.SliceIterate(func(s []byte) error {
 			kv := &bpb.KV{}
 			x.Check(kv.Unmarshal(s))
@@ -164,7 +164,7 @@ func (w *grpcWorker) ReceivePredicate(stream pb.Worker_ReceivePredicateServer) e
 		}
 		glog.V(2).Infof("Received batch of size: %s\n", humanize.IBytes(uint64(len(kvBuf.Data))))
 
-		buf := z.BufferFrom(kvBuf.Data)
+		buf := z.NewBufferSlice(kvBuf.Data)
 		buf.SliceIterate(func(_ []byte) error {
 			count++
 			return nil
diff --git a/worker/restore_map.go b/worker/restore_map.go
index d98262b5d83..8fa0ba60ce5 100644
--- a/worker/restore_map.go
+++ b/worker/restore_map.go
@@ -229,9 +229,9 @@ func (m *mapper) writeToDisk(buf *z.Buffer) error {
 }
 
 func newBuffer() *z.Buffer {
-	buf, err := z.NewBufferWithDir(mapFileSz, 2*mapFileSz, z.UseMmap, "", "Restore.Buffer")
+	buf, err := z.NewBufferTmp("", mapFileSz)
 	x.Check(err)
-	return buf
+	return buf.WithMaxSize(2 * mapFileSz)
 }
 
 func (mw *mapper) sendForWriting() error {
diff --git a/worker/restore_reduce.go b/worker/restore_reduce.go
index 43e5689ea1d..db44570c030 100644
--- a/worker/restore_reduce.go
+++ b/worker/restore_reduce.go
@@ -120,10 +120,7 @@ func newMapIterator(filename string) (*pb.MapHeader, *mapIterator) {
 func getBuf() *z.Buffer {
 	path := filepath.Join(x.WorkerConfig.TmpDir, "buffer")
 	x.Check(os.MkdirAll(path, 0750))
-	cbuf, err := z.NewBufferWithDir(64<<20, 64<<30, z.UseCalloc, path, "Restore.GetBuf")
-	x.Check(err)
-	cbuf.AutoMmapAfter(1 << 30)
-	return cbuf
+	return z.NewBuffer(64<<20, "Restore.GetBuf").WithAutoMmap(1<<30, path).WithMaxSize(64 << 30)
 }
 
 type reducer struct {
diff --git a/worker/snapshot.go b/worker/snapshot.go
index e7fde2339de..1b6e77af156 100644
--- a/worker/snapshot.go
+++ b/worker/snapshot.go
@@ -103,7 +103,7 @@ func (n *node) populateSnapshot(snap pb.Snapshot, pl *conn.Pool) error {
 		glog.V(1).Infof("Received batch of size: %s. Total so far: %s\n",
 			humanize.IBytes(uint64(len(kvs.Data))), humanize.IBytes(uint64(size)))
 
-		buf := z.BufferFrom(kvs.Data)
+		buf := z.NewBufferSlice(kvs.Data)
 		if err := writer.Write(buf); err != nil {
 			return err
 		}
diff --git a/xidmap/trie.go b/xidmap/trie.go
index 3df8b132b13..d2b3e4d9eb3 100644
--- a/xidmap/trie.go
+++ b/xidmap/trie.go
@@ -20,7 +20,6 @@ import (
 	"math"
 	"unsafe"
 
-	"github.com/dgraph-io/dgraph/x"
 	"github.com/dgraph-io/ristretto/z"
 )
 
@@ -34,8 +33,7 @@ type Trie struct {
 // NewTrie would return back a Trie backed by the provided Arena. Trie would assume ownership of the
 // Arena. Release must be called at the end to release Arena's resources.
 func NewTrie() *Trie {
-	buf, err := z.NewBufferWith(32<<20, math.MaxUint32, z.UseMmap, "Trie")
-	x.Check(err)
+	buf := z.NewBuffer(32<<20, "Trie").WithMaxSize(math.MaxUint32)
 	// Add additional 8 bytes at the start, because offset=0 is used for checking non-existing node.
 	// Therefore we can't keep root at 0 offset.
 	ro := buf.AllocateOffset(nodeSz + 8)
diff --git a/xidmap/xidmap.go b/xidmap/xidmap.go
index d1bc428e276..a7b59b075d8 100644
--- a/xidmap/xidmap.go
+++ b/xidmap/xidmap.go
@@ -103,7 +103,7 @@ func New(opts XidMapOptions) *XidMap {
 	}
 	for i := range xm.shards {
 		xm.shards[i] = &shard{
-			tree: z.NewTree(),
+			tree: z.NewTree("XidMap"),
 		}
 	}
 
@@ -331,6 +331,9 @@ func (m *XidMap) Flush() error {
 	// even during reduce phase. If bulk loader is running on large dataset, this occupies lot of
 	// memory and causing OOM sometimes. Making shards explicitly nil in this method fixes this.
 	// TODO: find why xidmap is not getting GCed without below line.
+	for _, shards := range m.shards {
+		shards.tree.Close()
+	}
 	m.shards = nil
 	if m.writer == nil {
 		return nil

From dd2e85294c2849b2c12df536bdc23f015b7875d3 Mon Sep 17 00:00:00 2001
From: Ajeet D'Souza <98ajeet@gmail.com>
Date: Wed, 5 May 2021 09:31:52 +0530
Subject: [PATCH 4/5] fix(Dgraph): Forward task status requests to correct
 Alpha (#7774)

---
 graphql/admin/backup.go |    4 +-
 graphql/admin/export.go |    4 +-
 graphql/admin/task.go   |   14 +-
 protos/pb.proto         |  906 +++++++++++++++++----------------
 protos/pb/pb.pb.go      | 1052 ++++++++++++++++++++++++++-------------
 testutil/utils.go       |    4 +-
 worker/backup.go        |    7 -
 worker/queue.go         |  236 +++++----
 worker/worker.go        |    3 +
 9 files changed, 1336 insertions(+), 894 deletions(-)

diff --git a/graphql/admin/backup.go b/graphql/admin/backup.go
index 0405d07ebc1..959515c6d74 100644
--- a/graphql/admin/backup.go
+++ b/graphql/admin/backup.go
@@ -62,9 +62,9 @@ func resolveBackup(ctx context.Context, m schema.Mutation) (*resolve.Resolved, b
 		return resolve.EmptyResult(m, err), false
 	}
 
-	msg := fmt.Sprintf("Backup queued with ID %s", taskId)
+	msg := fmt.Sprintf("Backup queued with ID %#x", taskId)
 	data := response("Success", msg)
-	data["taskId"] = taskId
+	data["taskId"] = fmt.Sprintf("%#x", taskId)
 	return resolve.DataResult(
 		m,
 		map[string]interface{}{m.Name(): data},
diff --git a/graphql/admin/export.go b/graphql/admin/export.go
index 45658dfccda..742e86b9582 100644
--- a/graphql/admin/export.go
+++ b/graphql/admin/export.go
@@ -97,9 +97,9 @@ func resolveExport(ctx context.Context, m schema.Mutation) (*resolve.Resolved, b
 		return resolve.EmptyResult(m, err), false
 	}
 
-	msg := fmt.Sprintf("Export queued with ID %s", taskId)
+	msg := fmt.Sprintf("Export queued with ID %#x", taskId)
 	data := response("Success", msg)
-	data["taskId"] = taskId
+	data["taskId"] = fmt.Sprintf("%#x", taskId)
 	return resolve.DataResult(
 		m,
 		map[string]interface{}{m.Name(): data},
diff --git a/graphql/admin/task.go b/graphql/admin/task.go
index e377f3fa082..e8d09296ce9 100644
--- a/graphql/admin/task.go
+++ b/graphql/admin/task.go
@@ -20,11 +20,14 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"strconv"
 	"time"
 
 	"github.com/dgraph-io/dgraph/graphql/resolve"
 	"github.com/dgraph-io/dgraph/graphql/schema"
+	"github.com/dgraph-io/dgraph/protos/pb"
 	"github.com/dgraph-io/dgraph/worker"
+	"github.com/pkg/errors"
 )
 
 type taskInput struct {
@@ -32,6 +35,7 @@ type taskInput struct {
 }
 
 func resolveTask(ctx context.Context, q schema.Query) *resolve.Resolved {
+	// Get Task ID.
 	input, err := getTaskInput(q)
 	if err != nil {
 		return resolve.EmptyResult(q, err)
@@ -39,11 +43,19 @@ func resolveTask(ctx context.Context, q schema.Query) *resolve.Resolved {
 	if input.Id == "" {
 		return resolve.EmptyResult(q, fmt.Errorf("task ID is missing"))
 	}
+	taskId, err := strconv.ParseUint(input.Id, 0, 64)
+	if err != nil {
+		err = errors.Wrapf(err, "invalid task ID: %s", input.Id)
+		return resolve.EmptyResult(q, err)
+	}
 
-	meta, err := worker.Tasks.Get(input.Id)
+	// Get TaskMeta from network.
+	req := &pb.TaskStatusRequest{TaskId: taskId}
+	resp, err := worker.TaskStatusOverNetwork(context.Background(), req)
 	if err != nil {
 		return resolve.EmptyResult(q, err)
 	}
+	meta := worker.TaskMeta(resp.GetTaskMeta())
 	return resolve.DataResult(
 		q,
 		map[string]interface{}{q.Name(): map[string]interface{}{
diff --git a/protos/pb.proto b/protos/pb.proto
index 24d3ce7d17c..0b53154b944 100644
--- a/protos/pb.proto
+++ b/protos/pb.proto
@@ -14,7 +14,6 @@
  * limitations under the License.
  */
 
-
 // Style guide for Protocol Buffer 3.
 // Use CamelCase (with an initial capital) for message names – for example,
 // SongServerRequest. Use underscore_separated_names for field names – for
@@ -36,599 +35,617 @@ import "github.com/gogo/protobuf/gogoproto/gogo.proto";
 /* option (gogoproto.goproto_getters_all) = true; */
 
 message List {
-	repeated fixed64 uids = 1;
+  repeated fixed64 uids = 1;
 }
 
 message TaskValue {
-	bytes val = 1;
-	Posting.ValType val_type = 2;
+  bytes val = 1;
+  Posting.ValType val_type = 2;
 }
 
 message SrcFunction {
-	string name = 1;
-	repeated string args = 3;
-	bool isCount = 4;
+  string name = 1;
+  repeated string args = 3;
+  bool isCount = 4;
 }
 
 message Query {
-	string attr = 1;
-	repeated string langs = 2; // language list for attribute
-	fixed64 after_uid = 3;  // Only return UIDs greater than this.
-	bool do_count = 4;      // Are we just getting lengths?
+  string attr = 1;
+  repeated string langs = 2;  // language list for attribute
+  fixed64 after_uid = 3;      // Only return UIDs greater than this.
+  bool do_count = 4;          // Are we just getting lengths?
 
-	// Exactly one of uids and terms is populated.
-	List uid_list = 5;
+  // Exactly one of uids and terms is populated.
+  List uid_list = 5;
 
-	// Function to generate or filter UIDs.
-	SrcFunction src_func = 6;
+  // Function to generate or filter UIDs.
+  SrcFunction src_func = 6;
 
-	bool reverse = 7;  // Whether this is a reverse edge.
+  bool reverse = 7;  // Whether this is a reverse edge.
 
-	FacetParams facet_param = 8; // which facets to fetch
-	FilterTree facets_filter = 9; // filtering on facets : has Op (and/or/not) tree
+  FacetParams facet_param = 8;  // which facets to fetch
+  FilterTree facets_filter =
+      9;  // filtering on facets : has Op (and/or/not) tree
 
-	bool expand_all = 10; // expand all language variants.
+  bool expand_all = 10;  // expand all language variants.
 
-	uint64 read_ts = 13;
-	int32 cache = 14;
-	int32 first = 15; // used to limit the number of result. Typically, the count is value of first
-	// field. Now, It's been used only for has query.
+  uint64 read_ts = 13;
+  int32 cache = 14;
+  int32 first = 15;  // used to limit the number of result. Typically, the count
+                     // is value of first
+                     // field. Now, It's been used only for has query.
 }
 
 message ValueList {
-	repeated TaskValue values = 1;
+  repeated TaskValue values = 1;
 }
 
 message LangList {
-	repeated string lang = 1;
+  repeated string lang = 1;
 }
 
 message Result {
-	repeated List uid_matrix = 1;
-	repeated ValueList value_matrix = 2;
-	repeated uint32 counts = 3;
-	bool intersect_dest = 4;
-	repeated FacetsList facet_matrix = 5;
-	repeated LangList lang_matrix = 6;
-	bool list = 7;
+  repeated List uid_matrix = 1;
+  repeated ValueList value_matrix = 2;
+  repeated uint32 counts = 3;
+  bool intersect_dest = 4;
+  repeated FacetsList facet_matrix = 5;
+  repeated LangList lang_matrix = 6;
+  bool list = 7;
 }
 
 message Order {
-	string attr = 1;
-	bool desc = 2;
-	repeated string langs = 3;
+  string attr = 1;
+  bool desc = 2;
+  repeated string langs = 3;
 }
 
 message SortMessage {
-	repeated Order order = 1;
-	repeated List uid_matrix = 2;
-	int32 count = 3;   // Return this many elements.
-	int32 offset = 4;  // Skip this many elements.
+  repeated Order order = 1;
+  repeated List uid_matrix = 2;
+  int32 count = 3;   // Return this many elements.
+  int32 offset = 4;  // Skip this many elements.
 
-	uint64 read_ts = 13;
+  uint64 read_ts = 13;
 }
 
 message SortResult {
-	repeated List uid_matrix = 1;
+  repeated List uid_matrix = 1;
 }
 
 message RaftContext {
-	fixed64 id = 1;
-	uint32 group = 2;
-	string addr = 3;
-	uint64 snapshot_ts = 4;
-	bool is_learner = 5;
+  fixed64 id = 1;
+  uint32 group = 2;
+  string addr = 3;
+  uint64 snapshot_ts = 4;
+  bool is_learner = 5;
 }
 
 // Member stores information about RAFT group member for a single RAFT node.
-// Note that each server can be serving multiple RAFT groups. Each group would have
-// one RAFT node per server serving that group.
+// Note that each server can be serving multiple RAFT groups. Each group would
+// have one RAFT node per server serving that group.
 message Member {
-	fixed64 id = 1;
-	uint32 group_id = 2 [(gogoproto.jsontag) = "groupId,omitempty"];
-	string addr = 3;
-	bool leader = 4;
-	bool am_dead = 5 [(gogoproto.jsontag) = "amDead,omitempty"];
-	uint64 last_update = 6 [(gogoproto.jsontag) = "lastUpdate,omitempty"];
-	bool learner = 7;
+  fixed64 id = 1;
+  uint32 group_id = 2 [(gogoproto.jsontag) = "groupId,omitempty"];
+  string addr = 3;
+  bool leader = 4;
+  bool am_dead = 5 [(gogoproto.jsontag) = "amDead,omitempty"];
+  uint64 last_update = 6 [(gogoproto.jsontag) = "lastUpdate,omitempty"];
+  bool learner = 7;
 
-	bool cluster_info_only = 13 [(gogoproto.jsontag) = "clusterInfoOnly,omitempty"];
-	bool force_group_id = 14 [(gogoproto.jsontag) = "forceGroupId,omitempty"];
+  bool cluster_info_only = 13
+      [(gogoproto.jsontag) = "clusterInfoOnly,omitempty"];
+  bool force_group_id = 14 [(gogoproto.jsontag) = "forceGroupId,omitempty"];
 }
 
 message Group {
-	map<uint64, Member> members = 1; // Raft ID is the key.
-	map<string, Tablet> tablets = 2; // Predicate + others are key.
-	uint64 snapshot_ts          = 3; // Stores Snapshot transaction ts.
-	uint64 checksum             = 4; // Stores a checksum.
-	uint64 checkpoint_ts        = 5; // Stores checkpoint ts as seen by leader.
+  map<uint64, Member> members = 1;  // Raft ID is the key.
+  map<string, Tablet> tablets = 2;  // Predicate + others are key.
+  uint64 snapshot_ts = 3;           // Stores Snapshot transaction ts.
+  uint64 checksum = 4;              // Stores a checksum.
+  uint64 checkpoint_ts = 5;         // Stores checkpoint ts as seen by leader.
 }
 
 message License {
-	string user = 1;
-	uint64 maxNodes = 2;
-	int64 expiryTs = 3;
-	bool enabled = 4;
+  string user = 1;
+  uint64 maxNodes = 2;
+  int64 expiryTs = 3;
+  bool enabled = 4;
 }
 
 message ZeroProposal {
-	reserved 8;  // Was used for string key.
-	map<uint32, uint64> snapshot_ts = 1; // Group ID -> Snapshot Ts.
-	Member member = 2;
-	Tablet tablet = 3;
-	uint64 maxUID = 4;
-	uint64 maxTxnTs = 5;
-	uint64 maxNsID = 12;
-	uint64 maxRaftId = 6;
-	api.TxnContext txn = 7;
-	string cid = 9; // Used as unique identifier for the cluster.
-	License license = 10;
-	ZeroSnapshot snapshot = 11; // Used to make Zeros take a snapshot.
-	// 12 has already been used.
-	DeleteNsRequest delete_ns = 13; // Used to delete namespace.
-}
-
-// MembershipState is used to pack together the current membership state of all the nodes
-// in the caller server; and the membership updates recorded by the callee server since
-// the provided lastUpdate.
+  reserved 8;                           // Was used for string key.
+  map<uint32, uint64> snapshot_ts = 1;  // Group ID -> Snapshot Ts.
+  Member member = 2;
+  Tablet tablet = 3;
+  uint64 maxUID = 4;
+  uint64 maxTxnTs = 5;
+  uint64 maxNsID = 12;
+  uint64 maxRaftId = 6;
+  api.TxnContext txn = 7;
+  string cid = 9;  // Used as unique identifier for the cluster.
+  License license = 10;
+  ZeroSnapshot snapshot = 11;  // Used to make Zeros take a snapshot.
+  // 12 has already been used.
+  DeleteNsRequest delete_ns = 13;  // Used to delete namespace.
+}
+
+// MembershipState is used to pack together the current membership state of all
+// the nodes in the caller server; and the membership updates recorded by the
+// callee server since the provided lastUpdate.
 message MembershipState {
-	uint64 counter = 1;  // used to find latest membershipState in case of race.
-	map<uint32, Group> groups = 2;
-	map<uint64, Member> zeros = 3;
-	uint64 maxUID = 4;
-	uint64 maxTxnTs = 5;
-	uint64 maxNsID = 10;
-	uint64 maxRaftId = 6;
-	repeated Member removed = 7;
-	string cid = 8; // Used to uniquely identify the Dgraph cluster.
-	License license = 9;
-	// 10 has already been used.
+  uint64 counter = 1;  // used to find latest membershipState in case of race.
+  map<uint32, Group> groups = 2;
+  map<uint64, Member> zeros = 3;
+  uint64 maxUID = 4;
+  uint64 maxTxnTs = 5;
+  uint64 maxNsID = 10;
+  uint64 maxRaftId = 6;
+  repeated Member removed = 7;
+  string cid = 8;  // Used to uniquely identify the Dgraph cluster.
+  License license = 9;
+  // 10 has already been used.
 }
 
 message ConnectionState {
-    Member member = 1;
-    MembershipState state = 2;
-    uint64 max_pending = 3; // Used to determine the timstamp for reading after bulk load
+  Member member = 1;
+  MembershipState state = 2;
+  uint64 max_pending =
+      3;  // Used to determine the timstamp for reading after bulk load
 }
 
 message HealthInfo {
-    string instance = 1;
-    string address = 2;
-    string status = 3;
-    string group = 4; // string so group = 0 can be printed in JSON.
-    string version = 5;
-    int64 uptime = 6;
-    int64 lastEcho = 7;
-    repeated string ongoing = 8;
-    repeated string indexing = 9;
-    repeated string ee_features = 10;
-		uint64 max_assigned = 11;
+  string instance = 1;
+  string address = 2;
+  string status = 3;
+  string group = 4;  // string so group = 0 can be printed in JSON.
+  string version = 5;
+  int64 uptime = 6;
+  int64 lastEcho = 7;
+  repeated string ongoing = 8;
+  repeated string indexing = 9;
+  repeated string ee_features = 10;
+  uint64 max_assigned = 11;
 }
 
 message Tablet {
-    uint32 group_id = 1 [(gogoproto.jsontag) = "groupId,omitempty"]; // Served by which group.
-    string predicate = 2;
-    bool force = 3; // Used while moving predicate.
-    int64 on_disk_bytes = 7;
-    bool remove = 8;
-    bool read_only = 9 [(gogoproto.jsontag) = "readOnly,omitempty"]; // If true, do not ask zero to serve any tablets.
-	uint64 move_ts = 10 [(gogoproto.jsontag) = "moveTs,omitempty"];
-	int64 uncompressed_bytes = 11; // Estimated uncompressed size of tablet in bytes
+  uint32 group_id = 1
+      [(gogoproto.jsontag) = "groupId,omitempty"];  // Served by which group.
+  string predicate = 2;
+  bool force = 3;  // Used while moving predicate.
+  int64 on_disk_bytes = 7;
+  bool remove = 8;
+  bool read_only = 9 [
+    (gogoproto.jsontag) = "readOnly,omitempty"
+  ];  // If true, do not ask zero to serve any tablets.
+  uint64 move_ts = 10 [(gogoproto.jsontag) = "moveTs,omitempty"];
+  int64 uncompressed_bytes =
+      11;  // Estimated uncompressed size of tablet in bytes
 }
 
 message DirectedEdge {
-	reserved 6;  // This was used for label.
-	fixed64 entity             = 1;    // Subject or source node / UID.
-	string attr                = 2;       // Attribute or predicate. Labels the edge.
-	bytes value                = 3;       // Edge points to a value.
-	Posting.ValType value_type = 4;  // The type of the value
-	fixed64 value_id           = 5;   // Object or destination node / UID.
-	string lang                = 7;
-	enum Op {
-		SET = 0;
-		DEL = 1;
-	}
-	Op op = 8;
-	repeated api.Facet facets = 9;
-	repeated string allowedPreds = 10;
-	uint64 namespace = 11;
+  reserved 6;                      // This was used for label.
+  fixed64 entity = 1;              // Subject or source node / UID.
+  string attr = 2;                 // Attribute or predicate. Labels the edge.
+  bytes value = 3;                 // Edge points to a value.
+  Posting.ValType value_type = 4;  // The type of the value
+  fixed64 value_id = 5;            // Object or destination node / UID.
+  string lang = 7;
+  enum Op {
+    SET = 0;
+    DEL = 1;
+  }
+  Op op = 8;
+  repeated api.Facet facets = 9;
+  repeated string allowedPreds = 10;
+  uint64 namespace = 11;
 }
 
 message Mutations {
-	uint32 group_id	= 1;
-	uint64 start_ts	= 2;
-	repeated DirectedEdge edges	= 3;
-	repeated SchemaUpdate schema = 4;
-	repeated TypeUpdate types	= 6;
-	enum DropOp {
-		NONE = 0;
-		ALL = 1;
-		DATA = 2;
-		TYPE = 3;
-	}
-	DropOp drop_op = 7;
-	string drop_value = 8;
-
-	Metadata metadata = 9;
+  uint32 group_id = 1;
+  uint64 start_ts = 2;
+  repeated DirectedEdge edges = 3;
+  repeated SchemaUpdate schema = 4;
+  repeated TypeUpdate types = 6;
+  enum DropOp {
+    NONE = 0;
+    ALL = 1;
+    DATA = 2;
+    TYPE = 3;
+  }
+  DropOp drop_op = 7;
+  string drop_value = 8;
+
+  Metadata metadata = 9;
 }
 
 message Metadata {
   // HintType represents a hint that will be passed along the mutation and used
   // to add the predicate to the schema if it's not already there.
   enum HintType {
-    // DEFAULT means no hint is provided and Dgraph will follow the default behavior.
+    // DEFAULT means no hint is provided and Dgraph will follow the default
+    // behavior.
     DEFAULT = 0;
-    // SINGLE signals that the predicate should be created as a single type (e.g string, uid).
+    // SINGLE signals that the predicate should be created as a single type (e.g
+    // string, uid).
     SINGLE = 1;
-    // LIST signals that the predicate should be created as a list (e.g [string], [uid]).
+    // LIST signals that the predicate should be created as a list (e.g
+    // [string], [uid]).
     LIST = 2;
   }
 
   // Map of predicates to their hints.
-	map<string, HintType> pred_hints = 1;
+  map<string, HintType> pred_hints = 1;
 }
 
 message Snapshot {
-	RaftContext context = 1;
-	uint64 index = 2;
-	uint64 read_ts = 3;
-	// done is used to indicate that snapshot stream was a success.
-	bool done	= 4;
-	// since_ts stores the ts of the last snapshot to support diff snap updates.
-	uint64 since_ts = 5;
+  RaftContext context = 1;
+  uint64 index = 2;
+  uint64 read_ts = 3;
+  // done is used to indicate that snapshot stream was a success.
+  bool done = 4;
+  // since_ts stores the ts of the last snapshot to support diff snap updates.
+  uint64 since_ts = 5;
 }
 
 message ZeroSnapshot {
-	uint64 index = 1;
-	uint64 checkpoint_ts = 2;
-	MembershipState state = 5;
+  uint64 index = 1;
+  uint64 checkpoint_ts = 2;
+  MembershipState state = 5;
 }
 
 message RestoreRequest {
-	uint32 group_id = 1;
-	uint64 restore_ts = 2;
-	string location = 3;
-	string backup_id = 4;
-
-	// Credentials when using a minio or S3 bucket as the backup location.
-	string access_key = 5;
-	string secret_key = 6;
-	string session_token = 7;
-	bool anonymous = 8;
-
-	// Info needed to process encrypted backups.
-	string encryption_key_file = 9;
-	// Vault options
-	string vault_addr = 10;
-	string vault_roleid_file = 11;
-	string vault_secretid_file = 12;
-	string vault_path = 13;
-	string vault_field = 14;
-	string vault_format = 15;
-
-	uint64 backup_num = 16;
+  uint32 group_id = 1;
+  uint64 restore_ts = 2;
+  string location = 3;
+  string backup_id = 4;
+
+  // Credentials when using a minio or S3 bucket as the backup location.
+  string access_key = 5;
+  string secret_key = 6;
+  string session_token = 7;
+  bool anonymous = 8;
+
+  // Info needed to process encrypted backups.
+  string encryption_key_file = 9;
+  // Vault options
+  string vault_addr = 10;
+  string vault_roleid_file = 11;
+  string vault_secretid_file = 12;
+  string vault_path = 13;
+  string vault_field = 14;
+  string vault_format = 15;
+
+  uint64 backup_num = 16;
 }
 
 message Proposal {
-	reserved 7; // Was used for string key.
-	Mutations mutations    		= 2;
-	repeated badgerpb3.KV kv  = 4;
-	MembershipState state  		= 5;
-	string clean_predicate 		= 6;  // Delete the predicate which was moved to other group.
-	OracleDelta delta      		= 8;
-	Snapshot snapshot      		= 9;  // Used to tell the group when to take snapshot.
-	uint64 index           		= 10; // Used to store Raft index, in raft.Ready.
-	uint64 expected_checksum 	= 11; // Block an operation until membership reaches this checksum.
-	RestoreRequest restore 		= 12;
-	CDCState cdc_state 				= 13;
-	DeleteNsRequest delete_ns = 14; // Used to delete namespace.
+  reserved 7;  // Was used for string key.
+  Mutations mutations = 2;
+  repeated badgerpb3.KV kv = 4;
+  MembershipState state = 5;
+  string clean_predicate =
+      6;  // Delete the predicate which was moved to other group.
+  OracleDelta delta = 8;
+  Snapshot snapshot = 9;  // Used to tell the group when to take snapshot.
+  uint64 index = 10;      // Used to store Raft index, in raft.Ready.
+  uint64 expected_checksum =
+      11;  // Block an operation until membership reaches this checksum.
+  RestoreRequest restore = 12;
+  CDCState cdc_state = 13;
+  DeleteNsRequest delete_ns = 14;  // Used to delete namespace.
 }
 
 message CDCState {
-	uint64 sent_ts    = 1;
+  uint64 sent_ts = 1;
 }
 
 message KVS {
-	bytes data = 5;
-
-	// done used to indicate if the stream of KVS is over.
-	bool done	= 2;
-	// predicates is the list of predicates known by the leader at the time of the snapshot.
-	repeated string predicates = 3;
-	// types is the list of types known by the leader at the time of the snapshot.
-	repeated string types = 4;
+  bytes data = 5;
+
+  // done used to indicate if the stream of KVS is over.
+  bool done = 2;
+  // predicates is the list of predicates known by the leader at the time of the
+  // snapshot.
+  repeated string predicates = 3;
+  // types is the list of types known by the leader at the time of the snapshot.
+  repeated string types = 4;
 }
 
 // Posting messages.
 message Posting {
-	reserved 6; // This was used for label.
-	fixed64 uid = 1;
-	bytes value = 2;
-	enum ValType {
-		DEFAULT = 0;
-		BINARY = 1;
-		INT = 2; // We treat it as int64.
-		FLOAT = 3;
-		BOOL = 4;
-		DATETIME = 5;
-		GEO = 6;
-		UID = 7;
-		PASSWORD = 8;
-		STRING = 9;
+  reserved 6;  // This was used for label.
+  fixed64 uid = 1;
+  bytes value = 2;
+  enum ValType {
+    DEFAULT = 0;
+    BINARY = 1;
+    INT = 2;  // We treat it as int64.
+    FLOAT = 3;
+    BOOL = 4;
+    DATETIME = 5;
+    GEO = 6;
+    UID = 7;
+    PASSWORD = 8;
+    STRING = 9;
     OBJECT = 10;
-	}
-	ValType val_type = 3;
-	enum PostingType {
-		REF=0;          // UID
-		VALUE=1;        // simple, plain value
-		VALUE_LANG=2;   // value with specified language
-	}
-	PostingType posting_type = 4;
-	bytes lang_tag = 5; // Only set for VALUE_LANG
-	repeated api.Facet facets = 9;
-
-	// TODO: op is only used temporarily. See if we can remove it from here.
-	uint32 op = 12;
-	uint64 start_ts = 13;   // Meant to use only inmemory
-	uint64 commit_ts = 14;  // Meant to use only inmemory
+  }
+  ValType val_type = 3;
+  enum PostingType {
+    REF = 0;         // UID
+    VALUE = 1;       // simple, plain value
+    VALUE_LANG = 2;  // value with specified language
+  }
+  PostingType posting_type = 4;
+  bytes lang_tag = 5;  // Only set for VALUE_LANG
+  repeated api.Facet facets = 9;
+
+  // TODO: op is only used temporarily. See if we can remove it from here.
+  uint32 op = 12;
+  uint64 start_ts = 13;   // Meant to use only inmemory
+  uint64 commit_ts = 14;  // Meant to use only inmemory
 }
 
 message UidBlock {
-	uint64 base = 1;
-	// deltas contains the deltas encoded with Varints. We don't store deltas as a list of integers,
-	// because when the PB is brought to memory, Go would always use 8-bytes per integer. Instead,
-	// storing it as a byte slice is a lot cheaper in memory.
-	bytes deltas = 2;
-	// num_uids is the number of UIDs in the block. We are including this because we want to
-	// switch encoding to groupvarint encoding. Current avaialble open source version implements
-	// encoding and decoding for uint32. To use that, we create different blocks for different 32-bit
-	// MSB base uids. That is, if the 32 MSBs are different, we will create a new block irrespective
-	// of whether the block is filled with the block_size or not.
-	// Default Blocksize is 256 so uint32 would be sufficient.
-	uint32 num_uids = 3;
+  uint64 base = 1;
+  // deltas contains the deltas encoded with Varints. We don't store deltas as a
+  // list of integers, because when the PB is brought to memory, Go would always
+  // use 8-bytes per integer. Instead, storing it as a byte slice is a lot
+  // cheaper in memory.
+  bytes deltas = 2;
+  // num_uids is the number of UIDs in the block. We are including this because
+  // we want to switch encoding to groupvarint encoding. Current avaialble open
+  // source version implements encoding and decoding for uint32. To use that, we
+  // create different blocks for different 32-bit MSB base uids. That is, if the
+  // 32 MSBs are different, we will create a new block irrespective of whether
+  // the block is filled with the block_size or not. Default Blocksize is 256 so
+  // uint32 would be sufficient.
+  uint32 num_uids = 3;
 }
 
 message UidPack {
-	uint32 block_size        = 1;
-	repeated UidBlock blocks = 2;
-	uint64 alloc_ref = 23; // This field should be set to 0 during marshal.
+  uint32 block_size = 1;
+  repeated UidBlock blocks = 2;
+  uint64 alloc_ref = 23;  // This field should be set to 0 during marshal.
 }
 
 message PostingList {
-	UidPack pack = 1; // Encoded list of uids in this posting list.
-	repeated Posting postings = 2;
-	uint64 commit_ts = 3; // More inclination towards smaller values.
+  UidPack pack = 1;  // Encoded list of uids in this posting list.
+  repeated Posting postings = 2;
+  uint64 commit_ts = 3;  // More inclination towards smaller values.
 
   repeated uint64 splits = 4;
 }
 
 message FacetParam {
-	string key = 1;
-	string alias = 2;
+  string key = 1;
+  string alias = 2;
 }
 
 message FacetParams {
-	bool all_keys = 1; // keys should be in sorted order.
-	repeated FacetParam param = 2;
+  bool all_keys = 1;  // keys should be in sorted order.
+  repeated FacetParam param = 2;
 }
 
 message Facets {
-	repeated api.Facet facets = 1;
+  repeated api.Facet facets = 1;
 }
 
 message FacetsList {
-	repeated Facets facets_list = 1;
+  repeated Facets facets_list = 1;
 }
 
 message Function {
-	string name = 1;          // Name of the function : eq, le
-	string key = 2;           // Facet key over which to run the function.
-	repeated string args = 3; // Arguments of the function.
+  string name = 1;           // Name of the function : eq, le
+  string key = 2;            // Facet key over which to run the function.
+  repeated string args = 3;  // Arguments of the function.
 }
 
 // Op and Children are internal nodes and Func on leaves.
 message FilterTree {
-	string op = 1;
-	repeated FilterTree children = 2;
-	Function func = 3;
+  string op = 1;
+  repeated FilterTree children = 2;
+  Function func = 3;
 }
 
 // Schema messages.
 message SchemaRequest {
-	uint32 group_id = 1;
-	repeated string predicates = 2;
-	// fields can be on of type, index, reverse or tokenizer
-	repeated string fields = 3;
+  uint32 group_id = 1;
+  repeated string predicates = 2;
+  // fields can be on of type, index, reverse or tokenizer
+  repeated string fields = 3;
 
   repeated string types = 4;
 }
 
 message SchemaNode {
-	string predicate = 1;
-	string type = 2;
-	bool index = 3;
-	repeated string tokenizer = 4;
-	bool reverse = 5;
-	bool count = 6;
-	bool list = 7;
-	bool upsert = 8;
-	bool lang = 9;
-	bool no_conflict = 10;
+  string predicate = 1;
+  string type = 2;
+  bool index = 3;
+  repeated string tokenizer = 4;
+  bool reverse = 5;
+  bool count = 6;
+  bool list = 7;
+  bool upsert = 8;
+  bool lang = 9;
+  bool no_conflict = 10;
 }
 
 message SchemaResult {
-	repeated SchemaNode schema = 1 [deprecated=true];
+  repeated SchemaNode schema = 1 [deprecated = true];
 }
 
 message SchemaUpdate {
-	string predicate = 1;
-	Posting.ValType value_type = 2;
-	enum Directive {
-	   NONE = 0;
-	   INDEX = 1;
-	   REVERSE = 2;
-	   DELETE = 3;
-	}
-	Directive directive = 3;
-	repeated string tokenizer = 4;
-	bool count = 5;
-	bool list = 6;
-	bool upsert = 8;
-	bool lang = 9;
-
-	// Fields required for type system.
-	bool non_nullable = 10;
-	bool non_nullable_list = 11;
-
-	// If value_type is OBJECT, then this represents an object type with a
-	// custom name. This field stores said name.
-	string object_type_name = 12;
-
-	bool no_conflict = 13;
-
-	// Deleted field:
-	reserved 7;
-	reserved "explicit";
+  string predicate = 1;
+  Posting.ValType value_type = 2;
+  enum Directive {
+    NONE = 0;
+    INDEX = 1;
+    REVERSE = 2;
+    DELETE = 3;
+  }
+  Directive directive = 3;
+  repeated string tokenizer = 4;
+  bool count = 5;
+  bool list = 6;
+  bool upsert = 8;
+  bool lang = 9;
+
+  // Fields required for type system.
+  bool non_nullable = 10;
+  bool non_nullable_list = 11;
+
+  // If value_type is OBJECT, then this represents an object type with a
+  // custom name. This field stores said name.
+  string object_type_name = 12;
+
+  bool no_conflict = 13;
+
+  // Deleted field:
+  reserved 7;
+  reserved "explicit";
 }
 
 message TypeUpdate {
-	string type_name = 1;
-	repeated SchemaUpdate fields = 2;
+  string type_name = 1;
+  repeated SchemaUpdate fields = 2;
 }
 
 message MapHeader {
-	repeated bytes partition_keys = 1;
+  repeated bytes partition_keys = 1;
 }
 
 message MovePredicatePayload {
-	string predicate         = 1;
-	uint32 source_gid        = 2;
-	uint32 dest_gid          = 3;
-	uint64 txn_ts            = 4;
-	uint64 expected_checksum = 5;
+  string predicate = 1;
+  uint32 source_gid = 2;
+  uint32 dest_gid = 3;
+  uint64 txn_ts = 4;
+  uint64 expected_checksum = 5;
 }
 
 message TxnStatus {
-	uint64 start_ts = 1;
-	uint64 commit_ts = 2;
+  uint64 start_ts = 1;
+  uint64 commit_ts = 2;
 }
 
 message OracleDelta {
-	repeated TxnStatus txns             = 1;
-	uint64 max_assigned                 = 2;
-	map<uint32, uint64> group_checksums = 3;
-	// implement tmax.
+  repeated TxnStatus txns = 1;
+  uint64 max_assigned = 2;
+  map<uint32, uint64> group_checksums = 3;
+  // implement tmax.
 }
 
 message TxnTimestamps {
-	repeated uint64 ts = 1;
+  repeated uint64 ts = 1;
 }
 
 message PeerResponse {
-	bool status = 1;
+  bool status = 1;
 }
 
 message RaftBatch {
-	RaftContext context = 1;
-	api.Payload payload = 2;
+  RaftContext context = 1;
+  api.Payload payload = 2;
 }
 
 service Raft {
-	rpc Heartbeat (api.Payload)        returns (stream HealthInfo) {}
-	rpc RaftMessage (stream RaftBatch) returns (api.Payload) {}
-	rpc JoinCluster (RaftContext)      returns (api.Payload) {}
-	rpc IsPeer (RaftContext)           returns (PeerResponse) {}
+  rpc Heartbeat(api.Payload) returns (stream HealthInfo) {}
+  rpc RaftMessage(stream RaftBatch) returns (api.Payload) {}
+  rpc JoinCluster(RaftContext) returns (api.Payload) {}
+  rpc IsPeer(RaftContext) returns (PeerResponse) {}
 }
 
 service Zero {
-	// These 3 endpoints are for handling membership.
-	rpc Connect (Member)               returns (ConnectionState) {}
-	rpc UpdateMembership (Group)                 returns (api.Payload) {}
-	rpc StreamMembership (api.Payload)       returns (stream MembershipState) {}
-
-	rpc Oracle (api.Payload)           returns (stream OracleDelta) {}
-	rpc ShouldServe (Tablet)           returns (Tablet) {}
-	rpc AssignIds (Num)               returns (AssignedIds) {}
-	rpc Timestamps (Num)               returns (AssignedIds) {}
-	rpc CommitOrAbort (api.TxnContext) returns (api.TxnContext) {}
-	rpc TryAbort (TxnTimestamps)       returns (OracleDelta) {}
-	rpc DeleteNamespace(DeleteNsRequest) returns (Status) {}
-	rpc RemoveNode (RemoveNodeRequest) returns (Status) {}
-	rpc MoveTablet (MoveTabletRequest) returns (Status) {}
-	rpc ApplyLicense (ApplyLicenseRequest) returns (Status) {}
+  // These 3 endpoints are for handling membership.
+  rpc Connect(Member) returns (ConnectionState) {}
+  rpc UpdateMembership(Group) returns (api.Payload) {}
+  rpc StreamMembership(api.Payload) returns (stream MembershipState) {}
+
+  rpc Oracle(api.Payload) returns (stream OracleDelta) {}
+  rpc ShouldServe(Tablet) returns (Tablet) {}
+  rpc AssignIds(Num) returns (AssignedIds) {}
+  rpc Timestamps(Num) returns (AssignedIds) {}
+  rpc CommitOrAbort(api.TxnContext) returns (api.TxnContext) {}
+  rpc TryAbort(TxnTimestamps) returns (OracleDelta) {}
+  rpc DeleteNamespace(DeleteNsRequest) returns (Status) {}
+  rpc RemoveNode(RemoveNodeRequest) returns (Status) {}
+  rpc MoveTablet(MoveTabletRequest) returns (Status) {}
+  rpc ApplyLicense(ApplyLicenseRequest) returns (Status) {}
 }
 
 service Worker {
-	// Data serving RPCs.
-	rpc Mutate (Mutations)                  returns (api.TxnContext) {}
-	rpc ServeTask (Query)                   returns (Result) {}
-	rpc StreamSnapshot (stream Snapshot)    returns (stream KVS) {}
-	rpc Sort (SortMessage)                  returns (SortResult) {}
-	rpc Schema (SchemaRequest)              returns (SchemaResult) {}
-	rpc Backup (BackupRequest)              returns (BackupResponse) {}
-	rpc Restore (RestoreRequest)            returns (Status) {}
-	rpc Export (ExportRequest)              returns (ExportResponse) {}
-	rpc ReceivePredicate(stream KVS)        returns (api.Payload) {}
-	rpc MovePredicate(MovePredicatePayload) returns (api.Payload) {}
-	rpc Subscribe(SubscriptionRequest) returns (stream badgerpb3.KVList) {}
-	rpc UpdateGraphQLSchema(UpdateGraphQLSchemaRequest) returns (UpdateGraphQLSchemaResponse) {}
-	rpc DeleteNamespace (DeleteNsRequest)              returns (Status) {}
+  // Data serving RPCs.
+  rpc Mutate(Mutations) returns (api.TxnContext) {}
+  rpc ServeTask(Query) returns (Result) {}
+  rpc StreamSnapshot(stream Snapshot) returns (stream KVS) {}
+  rpc Sort(SortMessage) returns (SortResult) {}
+  rpc Schema(SchemaRequest) returns (SchemaResult) {}
+  rpc Backup(BackupRequest) returns (BackupResponse) {}
+  rpc Restore(RestoreRequest) returns (Status) {}
+  rpc Export(ExportRequest) returns (ExportResponse) {}
+  rpc ReceivePredicate(stream KVS) returns (api.Payload) {}
+  rpc MovePredicate(MovePredicatePayload) returns (api.Payload) {}
+  rpc Subscribe(SubscriptionRequest) returns (stream badgerpb3.KVList) {}
+  rpc UpdateGraphQLSchema(UpdateGraphQLSchemaRequest)
+      returns (UpdateGraphQLSchemaResponse) {}
+  rpc DeleteNamespace(DeleteNsRequest) returns (Status) {}
+  rpc TaskStatus(TaskStatusRequest) returns (TaskStatusResponse) {}
 }
 
 message SubscriptionRequest {
-	repeated bytes prefixes = 1;
-	repeated badgerpb3.Match matches = 2;
+  repeated bytes prefixes = 1;
+  repeated badgerpb3.Match matches = 2;
 }
 
 message SubscriptionResponse {
-    badgerpb3.KVList kvs = 1;
+  badgerpb3.KVList kvs = 1;
 }
 
 message Num {
-	uint64 val = 1;
-	bool read_only = 2;
-	bool forwarded = 3; // True if this request was forwarded by a peer.
-	enum leaseType {
-		NS_ID = 0;
-		UID = 1;
-		TXN_TS = 2;
-	}
-	leaseType type = 4;
+  uint64 val = 1;
+  bool read_only = 2;
+  bool forwarded = 3;  // True if this request was forwarded by a peer.
+  enum leaseType {
+    NS_ID = 0;
+    UID = 1;
+    TXN_TS = 2;
+  }
+  leaseType type = 4;
 }
 
 message AssignedIds {
-	uint64 startId = 1;
-	uint64 endId = 2;
+  uint64 startId = 1;
+  uint64 endId = 2;
 
-	// The following is used for read only transactions.
-	uint64 read_only = 5;
+  // The following is used for read only transactions.
+  uint64 read_only = 5;
 }
 
 message RemoveNodeRequest {
-	uint64 nodeId = 1;
-	uint32 groupId = 2;
+  uint64 nodeId = 1;
+  uint32 groupId = 2;
 }
 
 message MoveTabletRequest {
-	uint64 namespace = 1;
-	string tablet = 2;
-	uint32 dstGroup = 3;
+  uint64 namespace = 1;
+  string tablet = 2;
+  uint32 dstGroup = 3;
 }
 
 message ApplyLicenseRequest {
-    bytes license = 1;
+  bytes license = 1;
 }
 
 message SnapshotMeta {
-	uint64 client_ts = 1;
-	uint32 group_id = 2;
+  uint64 client_ts = 1;
+  uint32 group_id = 2;
 }
 
 // Status describes a general status response.
 // code: 0 = success, 0 != failure.
 message Status {
-	int32 code = 1;
-	string msg = 2;
+  int32 code = 1;
+  string msg = 2;
 }
 
 // Backups record all data from since_ts to read_ts.
@@ -636,64 +653,65 @@ message Status {
 // the since_ts of the second backup.
 // Incremental backups can be disabled using the force_full field.
 message BackupRequest {
-	uint64 read_ts = 1;
-	uint64 since_ts = 2;
-	uint32 group_id = 3;
-	string unix_ts = 4;
-	string destination = 5;
-	string access_key = 6;
-	string secret_key = 7;
-	string session_token = 8;
+  uint64 read_ts = 1;
+  uint64 since_ts = 2;
+  uint32 group_id = 3;
+  string unix_ts = 4;
+  string destination = 5;
+  string access_key = 6;
+  string secret_key = 7;
+  string session_token = 8;
 
-	// True if no credentials should be used to access the S3 or minio bucket.
-	// For example, when using a bucket with a public policy.
-	bool anonymous = 9;
+  // True if no credentials should be used to access the S3 or minio bucket.
+  // For example, when using a bucket with a public policy.
+  bool anonymous = 9;
 
-	// The predicates to backup. All other predicates present in the group (e.g
-	// stale data from a predicate move) will be ignored.
-	repeated string predicates = 10;
+  // The predicates to backup. All other predicates present in the group (e.g
+  // stale data from a predicate move) will be ignored.
+  repeated string predicates = 10;
 
-	bool force_full = 11;
+  bool force_full = 11;
 }
 
 message BackupResponse {
-	repeated DropOperation drop_operations = 1;
+  repeated DropOperation drop_operations = 1;
 }
 
 message DropOperation {
-	enum DropOp {
-		ALL = 0;
-		DATA = 1;
-		ATTR = 2;
-		NS = 3;
-	}
-	DropOp drop_op    = 1;
-	// When drop_op is ATTR, drop_value will be the name of the ATTR; empty otherwise.
-	string drop_value = 2;
+  enum DropOp {
+    ALL = 0;
+    DATA = 1;
+    ATTR = 2;
+    NS = 3;
+  }
+  DropOp drop_op = 1;
+  // When drop_op is ATTR, drop_value will be the name of the ATTR; empty
+  // otherwise.
+  string drop_value = 2;
 }
 
 message ExportRequest {
-	uint32  group_id = 1;  // Group id to back up.
-	uint64  read_ts  = 2;
-	int64   unix_ts  = 3;
-	string  format   = 4;
+  uint32 group_id = 1;  // Group id to back up.
+  uint64 read_ts = 2;
+  int64 unix_ts = 3;
+  string format = 4;
 
-	string destination = 5;
+  string destination = 5;
 
-	// These credentials are used to access the S3 or minio bucket.
-	string access_key = 6;
-	string secret_key = 7;
-	string session_token = 8;
-	bool anonymous = 9;
+  // These credentials are used to access the S3 or minio bucket.
+  string access_key = 6;
+  string secret_key = 7;
+  string session_token = 8;
+  bool anonymous = 9;
 
-	uint64 namespace = 10;
+  uint64 namespace = 10;
 }
 
 message ExportResponse {
-	// 0 indicates a success, and a non-zero code indicates failure
-	int32 code = 1;
-	string msg = 2;
-	repeated string files = 3;
+  // 0 indicates a success, and a non-zero code indicates failure
+  int32 code = 1;
+  string msg = 2;
+  repeated string files = 3;
 }
 
 // A key stored in the format used for writing backups.
@@ -715,39 +733,47 @@ message BackupKey {
   uint64 start_uid = 4;
   string term = 5;
   uint32 count = 6;
-	uint64 namespace = 7;
+  uint64 namespace = 7;
 }
 
 // A posting list stored in the format used for writing backups.
 message BackupPostingList {
-	repeated uint64 uids = 1;
-	repeated Posting postings = 2;
-	uint64 commit_ts = 3;
+  repeated uint64 uids = 1;
+  repeated Posting postings = 2;
+  uint64 commit_ts = 3;
   repeated uint64 splits = 4;
-	bytes uid_bytes = 5;
+  bytes uid_bytes = 5;
 }
 
 message UpdateGraphQLSchemaRequest {
-	uint64                start_ts       = 1;
-	string                graphql_schema = 2;
-	repeated SchemaUpdate dgraph_preds   = 3;
-	repeated TypeUpdate   dgraph_types   = 4;
+  uint64 start_ts = 1;
+  string graphql_schema = 2;
+  repeated SchemaUpdate dgraph_preds = 3;
+  repeated TypeUpdate dgraph_types = 4;
 }
 
 message UpdateGraphQLSchemaResponse {
-	uint64 uid = 1;
+  uint64 uid = 1;
 }
 
 // BulkMeta stores metadata from the map phase of the bulk loader.
 message BulkMeta {
-	int64 edge_count = 1;
-	map<string, SchemaUpdate> schema_map = 2;
-	repeated TypeUpdate types = 3;
+  int64 edge_count = 1;
+  map<string, SchemaUpdate> schema_map = 2;
+  repeated TypeUpdate types = 3;
 }
 
 message DeleteNsRequest {
-	uint32 group_id = 1;
-	uint64 namespace = 2;
+  uint32 group_id = 1;
+  uint64 namespace = 2;
+}
+
+message TaskStatusRequest {
+  uint64 task_id = 1;
+}
+
+message TaskStatusResponse {
+  uint64 task_meta = 1;
 }
 
-// vim: noexpandtab sw=2 ts=2
+// vim: expandtab sw=2 ts=2
diff --git a/protos/pb/pb.pb.go b/protos/pb/pb.pb.go
index a8c66a442f7..c05b92bc897 100644
--- a/protos/pb/pb.pb.go
+++ b/protos/pb/pb.pb.go
@@ -91,11 +91,14 @@ func (Mutations_DropOp) EnumDescriptor() ([]byte, []int) {
 type Metadata_HintType int32
 
 const (
-	// DEFAULT means no hint is provided and Dgraph will follow the default behavior.
+	// DEFAULT means no hint is provided and Dgraph will follow the default
+	// behavior.
 	Metadata_DEFAULT Metadata_HintType = 0
-	// SINGLE signals that the predicate should be created as a single type (e.g string, uid).
+	// SINGLE signals that the predicate should be created as a single type (e.g
+	// string, uid).
 	Metadata_SINGLE Metadata_HintType = 1
-	// LIST signals that the predicate should be created as a list (e.g [string], [uid]).
+	// LIST signals that the predicate should be created as a list (e.g
+	// [string], [uid]).
 	Metadata_LIST Metadata_HintType = 2
 )
 
@@ -1067,8 +1070,8 @@ func (m *RaftContext) GetIsLearner() bool {
 }
 
 // Member stores information about RAFT group member for a single RAFT node.
-// Note that each server can be serving multiple RAFT groups. Each group would have
-// one RAFT node per server serving that group.
+// Note that each server can be serving multiple RAFT groups. Each group would
+// have one RAFT node per server serving that group.
 type Member struct {
 	Id              uint64 `protobuf:"fixed64,1,opt,name=id,proto3" json:"id,omitempty"`
 	GroupId         uint32 `protobuf:"varint,2,opt,name=group_id,json=groupId,proto3" json:"groupId,omitempty"`
@@ -1454,9 +1457,9 @@ func (m *ZeroProposal) GetDeleteNs() *DeleteNsRequest {
 	return nil
 }
 
-// MembershipState is used to pack together the current membership state of all the nodes
-// in the caller server; and the membership updates recorded by the callee server since
-// the provided lastUpdate.
+// MembershipState is used to pack together the current membership state of all
+// the nodes in the caller server; and the membership updates recorded by the
+// callee server since the provided lastUpdate.
 type MembershipState struct {
 	Counter   uint64             `protobuf:"varint,1,opt,name=counter,proto3" json:"counter,omitempty"`
 	Groups    map[uint32]*Group  `protobuf:"bytes,2,rep,name=groups,proto3" json:"groups,omitempty" protobuf_key:"varint,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
@@ -2595,7 +2598,8 @@ type KVS struct {
 	Data []byte `protobuf:"bytes,5,opt,name=data,proto3" json:"data,omitempty"`
 	// done used to indicate if the stream of KVS is over.
 	Done bool `protobuf:"varint,2,opt,name=done,proto3" json:"done,omitempty"`
-	// predicates is the list of predicates known by the leader at the time of the snapshot.
+	// predicates is the list of predicates known by the leader at the time of the
+	// snapshot.
 	Predicates []string `protobuf:"bytes,3,rep,name=predicates,proto3" json:"predicates,omitempty"`
 	// types is the list of types known by the leader at the time of the snapshot.
 	Types []string `protobuf:"bytes,4,rep,name=types,proto3" json:"types,omitempty"`
@@ -2774,16 +2778,18 @@ func (m *Posting) GetCommitTs() uint64 {
 
 type UidBlock struct {
 	Base uint64 `protobuf:"varint,1,opt,name=base,proto3" json:"base,omitempty"`
-	// deltas contains the deltas encoded with Varints. We don't store deltas as a list of integers,
-	// because when the PB is brought to memory, Go would always use 8-bytes per integer. Instead,
-	// storing it as a byte slice is a lot cheaper in memory.
+	// deltas contains the deltas encoded with Varints. We don't store deltas as a
+	// list of integers, because when the PB is brought to memory, Go would always
+	// use 8-bytes per integer. Instead, storing it as a byte slice is a lot
+	// cheaper in memory.
 	Deltas []byte `protobuf:"bytes,2,opt,name=deltas,proto3" json:"deltas,omitempty"`
-	// num_uids is the number of UIDs in the block. We are including this because we want to
-	// switch encoding to groupvarint encoding. Current avaialble open source version implements
-	// encoding and decoding for uint32. To use that, we create different blocks for different 32-bit
-	// MSB base uids. That is, if the 32 MSBs are different, we will create a new block irrespective
-	// of whether the block is filled with the block_size or not.
-	// Default Blocksize is 256 so uint32 would be sufficient.
+	// num_uids is the number of UIDs in the block. We are including this because
+	// we want to switch encoding to groupvarint encoding. Current avaialble open
+	// source version implements encoding and decoding for uint32. To use that, we
+	// create different blocks for different 32-bit MSB base uids. That is, if the
+	// 32 MSBs are different, we will create a new block irrespective of whether
+	// the block is filled with the block_size or not. Default Blocksize is 256 so
+	// uint32 would be sufficient.
 	NumUids uint32 `protobuf:"varint,3,opt,name=num_uids,json=numUids,proto3" json:"num_uids,omitempty"`
 }
 
@@ -4737,7 +4743,8 @@ func (m *BackupResponse) GetDropOperations() []*DropOperation {
 
 type DropOperation struct {
 	DropOp DropOperation_DropOp `protobuf:"varint,1,opt,name=drop_op,json=dropOp,proto3,enum=pb.DropOperation_DropOp" json:"drop_op,omitempty"`
-	// When drop_op is ATTR, drop_value will be the name of the ATTR; empty otherwise.
+	// When drop_op is ATTR, drop_value will be the name of the ATTR; empty
+	// otherwise.
 	DropValue string `protobuf:"bytes,2,opt,name=drop_value,json=dropValue,proto3" json:"drop_value,omitempty"`
 }
 
@@ -5361,6 +5368,94 @@ func (m *DeleteNsRequest) GetNamespace() uint64 {
 	return 0
 }
 
+type TaskStatusRequest struct {
+	TaskId uint64 `protobuf:"varint,1,opt,name=task_id,json=taskId,proto3" json:"task_id,omitempty"`
+}
+
+func (m *TaskStatusRequest) Reset()         { *m = TaskStatusRequest{} }
+func (m *TaskStatusRequest) String() string { return proto.CompactTextString(m) }
+func (*TaskStatusRequest) ProtoMessage()    {}
+func (*TaskStatusRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_f80abaa17e25ccc8, []int{70}
+}
+func (m *TaskStatusRequest) XXX_Unmarshal(b []byte) error {
+	return m.Unmarshal(b)
+}
+func (m *TaskStatusRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	if deterministic {
+		return xxx_messageInfo_TaskStatusRequest.Marshal(b, m, deterministic)
+	} else {
+		b = b[:cap(b)]
+		n, err := m.MarshalToSizedBuffer(b)
+		if err != nil {
+			return nil, err
+		}
+		return b[:n], nil
+	}
+}
+func (m *TaskStatusRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_TaskStatusRequest.Merge(m, src)
+}
+func (m *TaskStatusRequest) XXX_Size() int {
+	return m.Size()
+}
+func (m *TaskStatusRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_TaskStatusRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_TaskStatusRequest proto.InternalMessageInfo
+
+func (m *TaskStatusRequest) GetTaskId() uint64 {
+	if m != nil {
+		return m.TaskId
+	}
+	return 0
+}
+
+type TaskStatusResponse struct {
+	TaskMeta uint64 `protobuf:"varint,1,opt,name=task_meta,json=taskMeta,proto3" json:"task_meta,omitempty"`
+}
+
+func (m *TaskStatusResponse) Reset()         { *m = TaskStatusResponse{} }
+func (m *TaskStatusResponse) String() string { return proto.CompactTextString(m) }
+func (*TaskStatusResponse) ProtoMessage()    {}
+func (*TaskStatusResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_f80abaa17e25ccc8, []int{71}
+}
+func (m *TaskStatusResponse) XXX_Unmarshal(b []byte) error {
+	return m.Unmarshal(b)
+}
+func (m *TaskStatusResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	if deterministic {
+		return xxx_messageInfo_TaskStatusResponse.Marshal(b, m, deterministic)
+	} else {
+		b = b[:cap(b)]
+		n, err := m.MarshalToSizedBuffer(b)
+		if err != nil {
+			return nil, err
+		}
+		return b[:n], nil
+	}
+}
+func (m *TaskStatusResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_TaskStatusResponse.Merge(m, src)
+}
+func (m *TaskStatusResponse) XXX_Size() int {
+	return m.Size()
+}
+func (m *TaskStatusResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_TaskStatusResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_TaskStatusResponse proto.InternalMessageInfo
+
+func (m *TaskStatusResponse) GetTaskMeta() uint64 {
+	if m != nil {
+		return m.TaskMeta
+	}
+	return 0
+}
+
 func init() {
 	proto.RegisterEnum("pb.DirectedEdge_Op", DirectedEdge_Op_name, DirectedEdge_Op_value)
 	proto.RegisterEnum("pb.Mutations_DropOp", Mutations_DropOp_name, Mutations_DropOp_value)
@@ -5449,344 +5544,349 @@ func init() {
 	proto.RegisterType((*BulkMeta)(nil), "pb.BulkMeta")
 	proto.RegisterMapType((map[string]*SchemaUpdate)(nil), "pb.BulkMeta.SchemaMapEntry")
 	proto.RegisterType((*DeleteNsRequest)(nil), "pb.DeleteNsRequest")
+	proto.RegisterType((*TaskStatusRequest)(nil), "pb.TaskStatusRequest")
+	proto.RegisterType((*TaskStatusResponse)(nil), "pb.TaskStatusResponse")
 }
 
 func init() { proto.RegisterFile("pb.proto", fileDescriptor_f80abaa17e25ccc8) }
 
 var fileDescriptor_f80abaa17e25ccc8 = []byte{
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+	0xfb, 0xe2, 0x66, 0xe9, 0x97, 0xbf, 0xbe, 0xb9, 0xf0, 0xab, 0x5f, 0xdf, 0x5c, 0xf8, 0xc7, 0x5f,
+	0xdf, 0x5c, 0x38, 0xac, 0xd3, 0xff, 0xc0, 0x1e, 0xfd, 0x4f, 0x00, 0x00, 0x00, 0xff, 0xff, 0x7f,
+	0xce, 0x8c, 0xbd, 0x7d, 0x36, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -6618,6 +6718,7 @@ type WorkerClient interface {
 	Subscribe(ctx context.Context, in *SubscriptionRequest, opts ...grpc.CallOption) (Worker_SubscribeClient, error)
 	UpdateGraphQLSchema(ctx context.Context, in *UpdateGraphQLSchemaRequest, opts ...grpc.CallOption) (*UpdateGraphQLSchemaResponse, error)
 	DeleteNamespace(ctx context.Context, in *DeleteNsRequest, opts ...grpc.CallOption) (*Status, error)
+	TaskStatus(ctx context.Context, in *TaskStatusRequest, opts ...grpc.CallOption) (*TaskStatusResponse, error)
 }
 
 type workerClient struct {
@@ -6815,6 +6916,15 @@ func (c *workerClient) DeleteNamespace(ctx context.Context, in *DeleteNsRequest,
 	return out, nil
 }
 
+func (c *workerClient) TaskStatus(ctx context.Context, in *TaskStatusRequest, opts ...grpc.CallOption) (*TaskStatusResponse, error) {
+	out := new(TaskStatusResponse)
+	err := c.cc.Invoke(ctx, "/pb.Worker/TaskStatus", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // WorkerServer is the server API for Worker service.
 type WorkerServer interface {
 	// Data serving RPCs.
@@ -6831,6 +6941,7 @@ type WorkerServer interface {
 	Subscribe(*SubscriptionRequest, Worker_SubscribeServer) error
 	UpdateGraphQLSchema(context.Context, *UpdateGraphQLSchemaRequest) (*UpdateGraphQLSchemaResponse, error)
 	DeleteNamespace(context.Context, *DeleteNsRequest) (*Status, error)
+	TaskStatus(context.Context, *TaskStatusRequest) (*TaskStatusResponse, error)
 }
 
 // UnimplementedWorkerServer can be embedded to have forward compatible implementations.
@@ -6876,6 +6987,9 @@ func (*UnimplementedWorkerServer) UpdateGraphQLSchema(ctx context.Context, req *
 func (*UnimplementedWorkerServer) DeleteNamespace(ctx context.Context, req *DeleteNsRequest) (*Status, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method DeleteNamespace not implemented")
 }
+func (*UnimplementedWorkerServer) TaskStatus(ctx context.Context, req *TaskStatusRequest) (*TaskStatusResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method TaskStatus not implemented")
+}
 
 func RegisterWorkerServer(s *grpc.Server, srv WorkerServer) {
 	s.RegisterService(&_Worker_serviceDesc, srv)
@@ -7134,6 +7248,24 @@ func _Worker_DeleteNamespace_Handler(srv interface{}, ctx context.Context, dec f
 	return interceptor(ctx, in, info, handler)
 }
 
+func _Worker_TaskStatus_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(TaskStatusRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(WorkerServer).TaskStatus(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/pb.Worker/TaskStatus",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(WorkerServer).TaskStatus(ctx, req.(*TaskStatusRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 var _Worker_serviceDesc = grpc.ServiceDesc{
 	ServiceName: "pb.Worker",
 	HandlerType: (*WorkerServer)(nil),
@@ -7178,6 +7310,10 @@ var _Worker_serviceDesc = grpc.ServiceDesc{
 			MethodName: "DeleteNamespace",
 			Handler:    _Worker_DeleteNamespace_Handler,
 		},
+		{
+			MethodName: "TaskStatus",
+			Handler:    _Worker_TaskStatus_Handler,
+		},
 	},
 	Streams: []grpc.StreamDesc{
 		{
@@ -11438,6 +11574,62 @@ func (m *DeleteNsRequest) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 
+func (m *TaskStatusRequest) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalToSizedBuffer(dAtA[:size])
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *TaskStatusRequest) MarshalTo(dAtA []byte) (int, error) {
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
+}
+
+func (m *TaskStatusRequest) MarshalToSizedBuffer(dAtA []byte) (int, error) {
+	i := len(dAtA)
+	_ = i
+	var l int
+	_ = l
+	if m.TaskId != 0 {
+		i = encodeVarintPb(dAtA, i, uint64(m.TaskId))
+		i--
+		dAtA[i] = 0x8
+	}
+	return len(dAtA) - i, nil
+}
+
+func (m *TaskStatusResponse) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalToSizedBuffer(dAtA[:size])
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *TaskStatusResponse) MarshalTo(dAtA []byte) (int, error) {
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
+}
+
+func (m *TaskStatusResponse) MarshalToSizedBuffer(dAtA []byte) (int, error) {
+	i := len(dAtA)
+	_ = i
+	var l int
+	_ = l
+	if m.TaskMeta != 0 {
+		i = encodeVarintPb(dAtA, i, uint64(m.TaskMeta))
+		i--
+		dAtA[i] = 0x8
+	}
+	return len(dAtA) - i, nil
+}
+
 func encodeVarintPb(dAtA []byte, offset int, v uint64) int {
 	offset -= sovPb(v)
 	base := offset
@@ -13329,6 +13521,30 @@ func (m *DeleteNsRequest) Size() (n int) {
 	return n
 }
 
+func (m *TaskStatusRequest) Size() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	if m.TaskId != 0 {
+		n += 1 + sovPb(uint64(m.TaskId))
+	}
+	return n
+}
+
+func (m *TaskStatusResponse) Size() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	if m.TaskMeta != 0 {
+		n += 1 + sovPb(uint64(m.TaskMeta))
+	}
+	return n
+}
+
 func sovPb(x uint64) (n int) {
 	return (math_bits.Len64(x|1) + 6) / 7
 }
@@ -25795,6 +26011,144 @@ func (m *DeleteNsRequest) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
+func (m *TaskStatusRequest) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowPb
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= uint64(b&0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: TaskStatusRequest: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: TaskStatusRequest: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field TaskId", wireType)
+			}
+			m.TaskId = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowPb
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.TaskId |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		default:
+			iNdEx = preIndex
+			skippy, err := skipPb(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if (skippy < 0) || (iNdEx+skippy) < 0 {
+				return ErrInvalidLengthPb
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
+func (m *TaskStatusResponse) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowPb
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= uint64(b&0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: TaskStatusResponse: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: TaskStatusResponse: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field TaskMeta", wireType)
+			}
+			m.TaskMeta = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowPb
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.TaskMeta |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		default:
+			iNdEx = preIndex
+			skippy, err := skipPb(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if (skippy < 0) || (iNdEx+skippy) < 0 {
+				return ErrInvalidLengthPb
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
 func skipPb(dAtA []byte) (n int, err error) {
 	l := len(dAtA)
 	iNdEx := 0
diff --git a/testutil/utils.go b/testutil/utils.go
index e36bb174e5a..c0861bab533 100644
--- a/testutil/utils.go
+++ b/testutil/utils.go
@@ -72,6 +72,8 @@ func WaitForTask(t *testing.T, taskId string, useHttps bool) {
 	require.NoError(t, err)
 
 	for {
+		time.Sleep(4 * time.Second)
+
 		var adminUrl string
 		var client http.Client
 		if useHttps {
@@ -95,8 +97,6 @@ func WaitForTask(t *testing.T, taskId string, useHttps bool) {
 		case "Failed", "Unknown":
 			t.Errorf("task failed with status: %s", status)
 		}
-
-		time.Sleep(4 * time.Second)
 	}
 }
 
diff --git a/worker/backup.go b/worker/backup.go
index c1c537a87f4..7a17072c385 100644
--- a/worker/backup.go
+++ b/worker/backup.go
@@ -28,13 +28,6 @@ import (
 	"github.com/dgraph-io/dgraph/x"
 )
 
-const (
-	unknownStatus    = "UNKNOWN"
-	inProgressStatus = "IN_PROGRESS"
-	okStatus         = "OK"
-	errStatus        = "ERR"
-)
-
 // predicateSet is a map whose keys are predicates. It is meant to be used as a set.
 type predicateSet map[string]struct{}
 
diff --git a/worker/queue.go b/worker/queue.go
index 1f0b28e3a28..4e356accb55 100644
--- a/worker/queue.go
+++ b/worker/queue.go
@@ -23,10 +23,10 @@ import (
 	"math/rand"
 	"path/filepath"
 	"reflect"
-	"strconv"
 	"sync"
 	"time"
 
+	"github.com/dgraph-io/dgraph/conn"
 	"github.com/dgraph-io/dgraph/protos/pb"
 	"github.com/dgraph-io/dgraph/raftwal"
 	"github.com/dgraph-io/dgraph/x"
@@ -35,10 +35,63 @@ import (
 	"github.com/pkg/errors"
 )
 
+// TaskStatusOverNetwork fetches the status of a task over the network. Alphas only know about the
+// tasks created by them, but this function would fetch the task from the correct Alpha.
+func TaskStatusOverNetwork(ctx context.Context, req *pb.TaskStatusRequest,
+) (*pb.TaskStatusResponse, error) {
+	// Extract Raft ID from Task ID.
+	taskId := req.GetTaskId()
+	if taskId == 0 {
+		return nil, fmt.Errorf("invalid task ID: %#x", taskId)
+	}
+	raftId := taskId >> 32
+
+	// Skip the network call if the required Alpha is me.
+	myRaftId := State.WALstore.Uint(raftwal.RaftId)
+	if raftId == myRaftId {
+		worker := (*grpcWorker)(nil)
+		return worker.TaskStatus(ctx, req)
+	}
+
+	// Find the Alpha with the required Raft ID.
+	var addr string
+	for _, group := range groups().state.GetGroups() {
+		for _, member := range group.GetMembers() {
+			if member.GetId() == raftId {
+				addr = member.GetAddr()
+			}
+		}
+	}
+	if addr == "" {
+		return nil, fmt.Errorf("the Alpha that served that task is not available")
+	}
+
+	// Send the request to the Alpha.
+	pool, err := conn.GetPools().Get(addr)
+	if err != nil {
+		return nil, errors.Wrapf(err, "unable to reach the Alpha that served that task")
+	}
+	client := pb.NewWorkerClient(pool.Get())
+	return client.TaskStatus(ctx, req)
+}
+
+// TaskStatus retrieves metadata for a given task ID.
+func (*grpcWorker) TaskStatus(ctx context.Context, req *pb.TaskStatusRequest,
+) (*pb.TaskStatusResponse, error) {
+	taskId := req.GetTaskId()
+	meta, err := Tasks.get(taskId)
+	if err != nil {
+		return nil, err
+	}
+
+	resp := &pb.TaskStatusResponse{TaskMeta: meta.uint64()}
+	return resp, nil
+}
+
 var (
 	// Tasks is a global persistent task queue.
 	// Do not use this before calling InitTasks.
-	Tasks tasks
+	Tasks *tasks
 )
 
 // InitTasks initializes the global Tasks variable.
@@ -48,12 +101,11 @@ func InitTasks() {
 	x.Check(err)
 
 	// #nosec G404: weak RNG
-	Tasks = tasks{
-		queue:  make(chan taskRequest, 16),
-		log:    log,
-		logMu:  new(sync.Mutex),
-		raftId: State.WALstore.Uint(raftwal.RaftId),
-		rng:    rand.New(rand.NewSource(time.Now().UnixNano())),
+	Tasks = &tasks{
+		queue: make(chan taskRequest, 16),
+		log:   log,
+		logMu: new(sync.Mutex),
+		rng:   rand.New(rand.NewSource(time.Now().UnixNano())),
 	}
 
 	// Mark all pending tasks as failed.
@@ -79,42 +131,96 @@ type tasks struct {
 	log   *z.Tree
 	logMu *sync.Mutex
 
-	raftId uint64
-	rng    *rand.Rand
+	rng *rand.Rand
 }
 
-// Get retrieves metadata for a given task ID.
-// It returns 0 if the task was not found.
-func (t tasks) Get(id string) (TaskMeta, error) {
-	idUint64, err := strconv.ParseUint(id, 0, 64)
+// Enqueue adds a new task to the queue, waits for 3 seconds, and returns any errors that
+// may have happened in that span of time. The request must be of type:
+// - *pb.BackupRequest
+// - *pb.ExportRequest
+func (t *tasks) Enqueue(req interface{}) (uint64, error) {
+	if t == nil {
+		return 0, fmt.Errorf("task queue hasn't been initialized yet")
+	}
+
+	id, err := t.enqueue(req)
 	if err != nil {
-		return 0, errors.Wrapf(err, "task ID is invalid: %s", id)
+		return 0, err
+	}
+
+	// Wait for upto 3 seconds to check for errors.
+	for i := 0; i < 3; i++ {
+		time.Sleep(time.Second)
+
+		t.logMu.Lock()
+		meta := TaskMeta(t.log.Get(id))
+		t.logMu.Unlock()
+
+		// Early return
+		switch meta.Status() {
+		case TaskStatusFailed:
+			return 0, fmt.Errorf("task failed")
+		case TaskStatusSuccess:
+			return id, nil
+		}
 	}
-	if idUint64 == 0 || idUint64 == math.MaxUint64 {
-		return 0, fmt.Errorf("task ID is invalid: %d", idUint64)
+
+	return id, nil
+}
+
+// enqueue adds a new task to the queue. This must be of type:
+// - *pb.BackupRequest
+// - *pb.ExportRequest
+func (t *tasks) enqueue(req interface{}) (uint64, error) {
+	var kind TaskKind
+	switch req.(type) {
+	case *pb.BackupRequest:
+		kind = TaskKindBackup
+	case *pb.ExportRequest:
+		kind = TaskKindExport
+	default:
+		err := fmt.Errorf("invalid TaskKind: %d", kind)
+		panic(err)
 	}
+
 	t.logMu.Lock()
 	defer t.logMu.Unlock()
-	meta := TaskMeta(t.log.Get(idUint64))
-	if meta == 0 {
-		return 0, fmt.Errorf("task does not exist or has expired")
+
+	task := taskRequest{
+		id:  t.newId(),
+		req: req,
+	}
+	select {
+	// t.logMu must be acquired before pushing to t.queue, otherwise the worker might start the
+	// task, and won't be able to find it in t.log.
+	case t.queue <- task:
+		t.log.Set(task.id, newTaskMeta(kind, TaskStatusQueued).uint64())
+		return task.id, nil
+	default:
+		return 0, fmt.Errorf("too many pending tasks, please try again later")
 	}
-	return meta, nil
 }
 
-// cleanup deletes all expired tasks.
-func (t tasks) cleanup() {
-	const taskTtl = 7 * 24 * time.Hour // 1 week
-	minTs := time.Now().UTC().Add(-taskTtl).Unix()
-	minMeta := uint64(minTs) << 32
+// get retrieves metadata for a given task ID.
+func (t *tasks) get(id uint64) (TaskMeta, error) {
+	if t == nil {
+		return 0, fmt.Errorf("task queue hasn't been initialized yet")
+	}
 
+	if id == 0 || id == math.MaxUint64 {
+		return 0, fmt.Errorf("task ID is invalid: %d", id)
+	}
 	t.logMu.Lock()
 	defer t.logMu.Unlock()
-	t.log.DeleteBelow(minMeta)
+	meta := TaskMeta(t.log.Get(id))
+	if meta == 0 {
+		return 0, fmt.Errorf("task does not exist or has expired")
+	}
+	return meta, nil
 }
 
 // worker loops forever, running queued tasks one at a time. Any returned errors are logged.
-func (t tasks) worker() {
+func (t *tasks) worker() {
 	shouldCleanup := time.NewTicker(time.Hour)
 	defer shouldCleanup.Stop()
 	for {
@@ -136,7 +242,7 @@ func (t tasks) worker() {
 	}
 }
 
-func (t tasks) run(task taskRequest) error {
+func (t *tasks) run(task taskRequest) error {
 	// Fetch the task from the log. If the task isn't found, this means it has expired (older than
 	// taskTtl).
 	t.logMu.Lock()
@@ -175,68 +281,15 @@ func (t tasks) run(task taskRequest) error {
 	return err
 }
 
-// Enqueue adds a new task to the queue, waits for 3 seconds, and returns any errors that
-// may have happened in that span of time. The request must be of type:
-// - *pb.BackupRequest
-// - *pb.ExportRequest
-func (t tasks) Enqueue(req interface{}) (string, error) {
-	id, err := t.enqueue(req)
-	if err != nil {
-		return "", err
-	}
-	taskId := fmt.Sprintf("%#x", id)
-
-	// Wait for upto 3 seconds to check for errors.
-	for i := 0; i < 3; i++ {
-		time.Sleep(time.Second)
-
-		t.logMu.Lock()
-		meta := TaskMeta(t.log.Get(id))
-		t.logMu.Unlock()
-
-		// Early return
-		switch meta.Status() {
-		case TaskStatusFailed:
-			return "", fmt.Errorf("an error occurred, please check logs for details")
-		case TaskStatusSuccess:
-			return taskId, nil
-		}
-	}
-
-	return taskId, nil
-}
-
-// enqueue adds a new task to the queue. This must be of type:
-// - *pb.BackupRequest
-// - *pb.ExportRequest
-func (t tasks) enqueue(req interface{}) (uint64, error) {
-	var kind TaskKind
-	switch req.(type) {
-	case *pb.BackupRequest:
-		kind = TaskKindBackup
-	case *pb.ExportRequest:
-		kind = TaskKindExport
-	default:
-		err := fmt.Errorf("invalid TaskKind: %d", kind)
-		panic(err)
-	}
+// cleanup deletes all expired tasks.
+func (t *tasks) cleanup() {
+	const taskTtl = 7 * 24 * time.Hour // 1 week
+	minTs := time.Now().UTC().Add(-taskTtl).Unix()
+	minMeta := uint64(minTs) << 32
 
 	t.logMu.Lock()
 	defer t.logMu.Unlock()
-
-	task := taskRequest{
-		id:  t.newId(),
-		req: req,
-	}
-	select {
-	// t.logMu must be acquired before pushing to t.queue, otherwise the worker might start the
-	// task, and won't be able to find it in t.log.
-	case t.queue <- task:
-		t.log.Set(task.id, newTaskMeta(kind, TaskStatusQueued).uint64())
-		return task.id, nil
-	default:
-		return 0, fmt.Errorf("too many pending tasks, please try again later")
-	}
+	t.log.DeleteBelow(minMeta)
 }
 
 // newId generates a random unique task ID. logMu must be acquired before calling this function.
@@ -244,9 +297,10 @@ func (t tasks) enqueue(req interface{}) (uint64, error) {
 // The format of this is:
 // 32 bits: raft ID
 // 32 bits: random number
-func (t tasks) newId() uint64 {
+func (t *tasks) newId() uint64 {
+	myRaftId := State.WALstore.Uint(raftwal.RaftId)
 	for {
-		id := t.raftId<<32 | uint64(t.rng.Int())
+		id := myRaftId<<32 | uint64(t.rng.Intn(math.MaxUint32))
 		// z.Tree cannot store 0 or math.MaxUint64. Check that id is unique.
 		if id != 0 && id != math.MaxUint64 && t.log.Get(id) == 0 {
 			return id
@@ -260,7 +314,7 @@ type taskRequest struct {
 }
 
 // run starts a task and blocks till it completes.
-func (t taskRequest) run() error {
+func (t *taskRequest) run() error {
 	switch req := t.req.(type) {
 	case *pb.BackupRequest:
 		if err := ProcessBackupRequest(context.Background(), req); err != nil {
diff --git a/worker/worker.go b/worker/worker.go
index 2be3103d95d..c8db45f3e3e 100644
--- a/worker/worker.go
+++ b/worker/worker.go
@@ -80,6 +80,9 @@ type grpcWorker struct {
 	sync.Mutex
 }
 
+// grpcWorker implements pb.WorkerServer.
+var _ pb.WorkerServer = (*grpcWorker)(nil)
+
 func (w *grpcWorker) Subscribe(
 	req *pb.SubscriptionRequest, stream pb.Worker_SubscribeServer) error {
 	// Subscribe on given prefixes.

From dfbc9e88839d76659ca86d33439732befd41ba2f Mon Sep 17 00:00:00 2001
From: Ajeet D'Souza <98ajeet@gmail.com>
Date: Wed, 5 May 2021 18:23:29 +0530
Subject: [PATCH 5/5] Update ristretto

---
 go.mod | 2 +-
 go.sum | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/go.mod b/go.mod
index 851fd6203fa..d098a0f0bf0 100644
--- a/go.mod
+++ b/go.mod
@@ -19,7 +19,7 @@ require (
 	github.com/dgraph-io/gqlgen v0.13.2
 	github.com/dgraph-io/gqlparser/v2 v2.2.0
 	github.com/dgraph-io/graphql-transport-ws v0.0.0-20210223074046-e5b8b80bb4ed
-	github.com/dgraph-io/ristretto v0.0.4-0.20210428103110-8405ab9b246f
+	github.com/dgraph-io/ristretto v0.0.4-0.20210504190834-0bf2acd73aa3
 	github.com/dgraph-io/simdjson-go v0.3.0
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
 	github.com/dgrijalva/jwt-go/v4 v4.0.0-preview1
diff --git a/go.sum b/go.sum
index 2a08b2004cf..722f7ca814a 100644
--- a/go.sum
+++ b/go.sum
@@ -131,8 +131,8 @@ github.com/dgraph-io/gqlparser/v2 v2.2.0/go.mod h1:MYS4jppjyx8b9tuUtjV7jU1UFZK6P
 github.com/dgraph-io/graphql-transport-ws v0.0.0-20210223074046-e5b8b80bb4ed h1:pgGMBoTtFhR+xkyzINaToLYRurHn+6pxMYffIGmmEPc=
 github.com/dgraph-io/graphql-transport-ws v0.0.0-20210223074046-e5b8b80bb4ed/go.mod h1:7z3c/5w0sMYYZF5bHsrh8IH4fKwG5O5Y70cPH1ZLLRQ=
 github.com/dgraph-io/ristretto v0.0.4-0.20210309073149-3836124cdc5a/go.mod h1:MIonLggsKgZLUSt414ExgwNtlOL5MuEoAJP514mwGe8=
-github.com/dgraph-io/ristretto v0.0.4-0.20210428103110-8405ab9b246f h1:vupa/2tdIvqUTP0Md7MMvdKwCQjF48m+T6LZRVc+3cg=
-github.com/dgraph-io/ristretto v0.0.4-0.20210428103110-8405ab9b246f/go.mod h1:fux0lOrBhrVCJd3lcTHsIJhq1T2rokOu6v9Vcb3Q9ug=
+github.com/dgraph-io/ristretto v0.0.4-0.20210504190834-0bf2acd73aa3 h1:jU/wpYsEL+8JPLf/QcjkQKI5g0dOjSuwcMjkThxt5x0=
+github.com/dgraph-io/ristretto v0.0.4-0.20210504190834-0bf2acd73aa3/go.mod h1:fux0lOrBhrVCJd3lcTHsIJhq1T2rokOu6v9Vcb3Q9ug=
 github.com/dgraph-io/simdjson-go v0.3.0 h1:h71LO7vR4LHMPUhuoGN8bqGm1VNfGOlAG8BI6iDUKw0=
 github.com/dgraph-io/simdjson-go v0.3.0/go.mod h1:Otpysdjaxj9OGaJusn4pgQV7OFh2bELuHANq0I78uvY=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumCAMpl/TFQ4/5kLM=