bug-fix: use table-info-before always and fix bug for recover lock in…

… optimistic (#1518)

_utils/terror_gen/errors_release.txt

@@ -373,6 +373,7 @@ ErrMasterTLSConfigNotValid,[code=38051:class=dm-master:scope=internal:level=high
 ErrMasterBoundChanging,[code=38052:class=dm-master:scope=internal:level=low], "Message: source bound is changed too frequently, last old bound %s:, new bound %s, Workaround: Please try again later"
 ErrMasterFailToImportFromV10x,[code=38053:class=dm-master:scope=internal:level=high], "Message: fail to import DM cluster from v1.0.x, Workaround: Please confirm that you have not violated any restrictions in the upgrade documentation."
 ErrMasterInconsistentOptimisticDDLsAndInfo,[code=38054:class=dm-master:scope=internal:level=high], "Message: inconsistent count of optimistic ddls and table infos, ddls: %d, table info: %d"
+ErrMasterOptimisticTableInfoBeforeNotExist,[code=38055:class=dm-master:scope=internal:level=high], "Message: table-info-before not exist in optimistic ddls: %v"
 ErrWorkerParseFlagSet,[code=40001:class=dm-worker:scope=internal:level=medium], "Message: parse dm-worker config flag set"
 ErrWorkerInvalidFlag,[code=40002:class=dm-worker:scope=internal:level=medium], "Message: '%s' is an invalid flag"
 ErrWorkerDecodeConfigFromFile,[code=40003:class=dm-worker:scope=internal:level=medium], "Message: toml decode file, Workaround: Please check the configuration file has correct TOML format."

dm/master/server_test.go

@@ -637,6 +637,7 @@ func (t *testMaster) TestStartTaskWithRemoveMeta(c *check.C) {
 		op1      = optimism.NewOperation(ID, taskName, sources[0], info1.UpSchema, info1.UpTable, DDLs1, optimism.ConflictNone, false)
 	)
 
+	st1.AddTable("foo-1", "bar-1", schema, table)
 	_, err = optimism.PutSourceTables(etcdTestCli, st1)
 	c.Assert(err, check.IsNil)
 	_, err = optimism.PutInfo(etcdTestCli, info1)

dm/master/shardddl/optimist.go

@@ -22,6 +22,7 @@ import (
 
 	"github.com/pingcap/failpoint"
 	"github.com/pingcap/tidb-tools/pkg/dbutil"
+	"github.com/pingcap/tidb-tools/pkg/schemacmp"
 	"go.etcd.io/etcd/clientv3"
 	"go.uber.org/zap"
 
@@ -33,6 +34,7 @@ import (
 	"github.com/pingcap/dm/pkg/log"
 	"github.com/pingcap/dm/pkg/shardddl/optimism"
 	"github.com/pingcap/dm/pkg/terror"
+	"github.com/pingcap/dm/pkg/utils"
 )
 
 // Optimist is used to coordinate the shard DDL migration in optimism mode.
@@ -255,29 +257,83 @@ func (o *Optimist) rebuildLocks() (revSource, revInfo, revOperation int64, err e
 	return revSource, revInfo, revOperation, nil
 }
 
-// recoverLocks recovers shard DDL locks based on shard DDL info and shard DDL lock operation.
-func (o *Optimist) recoverLocks(
-	ifm map[string]map[string]map[string]map[string]optimism.Info,
-	opm map[string]map[string]map[string]map[string]optimism.Operation) error {
-	// construct locks based on the shard DDL info.
-	for task, ifTask := range ifm {
+// sortInfos sort all infos by revision
+func sortInfos(ifm map[string]map[string]map[string]map[string]optimism.Info) []optimism.Info {
+	infos := make([]optimism.Info, 0, len(ifm))
+
+	for _, ifTask := range ifm {
 		for _, ifSource := range ifTask {
 			for _, ifSchema := range ifSource {
 				for _, info := range ifSchema {
-					tts := o.tk.FindTables(task, info.DownSchema, info.DownTable)
-					_, _, err := o.lk.TrySync(info, tts)
-					if err != nil {
-						return err
+					infos = append(infos, info)
+				}
+			}
+		}
+	}
+
+	// sort according to the Revision
+	sort.Slice(infos, func(i, j int) bool {
+		return infos[i].Revision < infos[j].Revision
+	})
+	return infos
+}
+
+// buildLockJoinedAndTTS build joined table and target table slice for lock by history infos
+func (o *Optimist) buildLockJoinedAndTTS(ifm map[string]map[string]map[string]map[string]optimism.Info) (map[string]schemacmp.Table, map[string][]optimism.TargetTable) {
+	lockJoined := make(map[string]schemacmp.Table)
+	lockTTS := make(map[string][]optimism.TargetTable)
+
+	for _, taskInfos := range ifm {
+		for _, sourceInfos := range taskInfos {
+			for _, schemaInfos := range sourceInfos {
+				for _, info := range schemaInfos {
+					lockID := utils.GenDDLLockID(info.Task, info.DownSchema, info.DownTable)
+					if joined, ok := lockJoined[lockID]; !ok {
+						lockJoined[lockID] = schemacmp.Encode(info.TableInfoBefore)
+					} else {
+						newJoined, err := joined.Join(schemacmp.Encode(info.TableInfoBefore))
+						// ignore error, will report it in TrySync later
+						if err != nil {
+							o.logger.Error(fmt.Sprintf("fail to join table info %s with %s, lockID: %s in recover lock", joined, newJoined, lockID), log.ShortError(err))
+						} else {
+							lockJoined[lockID] = newJoined
+						}
 					}
-					// never mark the lock operation from `done` to `not-done` when recovering.
-					err = o.handleLock(info, tts, true)
-					if err != nil {
-						return err
+					if _, ok := lockTTS[lockID]; !ok {
+						lockTTS[lockID] = o.tk.FindTables(info.Task, info.DownSchema, info.DownTable)
 					}
 				}
 			}
 		}
 	}
+	return lockJoined, lockTTS
+}
+
+// recoverLocks recovers shard DDL locks based on shard DDL info and shard DDL lock operation.
+func (o *Optimist) recoverLocks(
+	ifm map[string]map[string]map[string]map[string]optimism.Info,
+	opm map[string]map[string]map[string]map[string]optimism.Operation) error {
+	// construct joined table based on the shard DDL info.
+	o.logger.Info("build lock joined and tts")
+	lockJoined, lockTTS := o.buildLockJoinedAndTTS(ifm)
+	// build lock and restore table info
+	o.logger.Info("rebuild locks and tables")
+	o.lk.RebuildLocksAndTables(ifm, lockJoined, lockTTS)
+	// sort infos by revision
+	infos := sortInfos(ifm)
+
+	for _, info := range infos {
+		tts := o.tk.FindTables(info.Task, info.DownSchema, info.DownTable)
+		_, _, err := o.lk.TrySync(info, tts)
+		if err != nil {
+			return err
+		}
+		// never mark the lock operation from `done` to `not-done` when recovering.
+		err = o.handleLock(info, tts, true)
+		if err != nil {
+			return err
+		}
+	}
 
 	// update the done status of the lock.
 	for _, opTask := range opm {

dm/master/shardddl/optimist_test.go

@@ -23,6 +23,7 @@ import (
 	"github.com/pingcap/parser/ast"
 	"github.com/pingcap/parser/model"
 	"github.com/pingcap/tidb-tools/pkg/dbutil"
+	"github.com/pingcap/tidb-tools/pkg/schemacmp"
 	tiddl "github.com/pingcap/tidb/ddl"
 	"github.com/pingcap/tidb/sessionctx"
 	"github.com/pingcap/tidb/util/mock"
@@ -148,6 +149,7 @@ func (t *testOptimist) TestOptimist(c *C) {
 	t.testOptimist(c, noRestart)
 	t.testOptimist(c, restartOnly)
 	t.testOptimist(c, restartNewInstance)
+	t.testSortInfos(c)
 }
 
 func (t *testOptimist) testOptimist(c *C, restart int) {
@@ -656,14 +658,13 @@ func (t *testOptimist) TestOptimistLockConflict(c *C) {
 		tblID        int64 = 111
 		DDLs1              = []string{"ALTER TABLE bar ADD COLUMN c1 TEXT"}
 		DDLs2              = []string{"ALTER TABLE bar ADD COLUMN c1 DATETIME"}
-		DDLs3              = []string{"ALTER TABLE bar DROP COLUMN c1"}
 		ti0                = createTableInfo(c, p, se, tblID, `CREATE TABLE bar (id INT PRIMARY KEY)`)
 		ti1                = createTableInfo(c, p, se, tblID, `CREATE TABLE bar (id INT PRIMARY KEY, c1 TEXT)`)
 		ti2                = createTableInfo(c, p, se, tblID, `CREATE TABLE bar (id INT PRIMARY KEY, c1 DATETIME)`)
 		ti3                = ti0
 		i1                 = optimism.NewInfo(task, source1, "foo", "bar-1", downSchema, downTable, DDLs1, ti0, []*model.TableInfo{ti1})
 		i2                 = optimism.NewInfo(task, source1, "foo", "bar-2", downSchema, downTable, DDLs2, ti0, []*model.TableInfo{ti2})
-		i3                 = optimism.NewInfo(task, source1, "foo", "bar-2", downSchema, downTable, DDLs3, ti2, []*model.TableInfo{ti3})
+		i3                 = optimism.NewInfo(task, source1, "foo", "bar-2", downSchema, downTable, DDLs1, ti0, []*model.TableInfo{ti3})
 	)
 
 	st1.AddTable("foo", "bar-1", downSchema, downTable)
@@ -714,6 +715,7 @@ func (t *testOptimist) TestOptimistLockConflict(c *C) {
 	c.Assert(len(errCh), Equals, 0)
 
 	// PUT i3, no conflict now.
+	// case for handle-error replace
 	rev3, err := optimism.PutInfo(etcdTestCli, i3)
 	c.Assert(err, IsNil)
 	// wait operation for i3 become available.
@@ -1029,3 +1031,127 @@ func (t *testOptimist) TestOptimistInitSchema(c *C) {
 	c.Assert(err, IsNil)
 	c.Assert(is.TableInfo, DeepEquals, ti1) // the init schema is ti1 now.
 }
+
+func (t *testOptimist) testSortInfos(c *C) {
+	defer clearOptimistTestSourceInfoOperation(c)
+
+	var (
+		task       = "test-optimist-init-schema"
+		sources    = []string{"mysql-replica-1", "mysql-replica-2"}
+		upSchema   = "foo"
+		upTables   = []string{"bar-1", "bar-2"}
+		downSchema = "foo"
+		downTable  = "bar"
+
+		p           = parser.New()
+		se          = mock.NewContext()
+		tblID int64 = 111
+		DDLs1       = []string{"ALTER TABLE bar ADD COLUMN c1 TEXT"}
+		DDLs2       = []string{"ALTER TABLE bar ADD COLUMN c2 INT"}
+		ti0         = createTableInfo(c, p, se, tblID, `CREATE TABLE bar (id INT PRIMARY KEY)`)
+		ti1         = createTableInfo(c, p, se, tblID, `CREATE TABLE bar (id INT PRIMARY KEY, c1 TEXT)`)
+		ti2         = createTableInfo(c, p, se, tblID, `CREATE TABLE bar (id INT PRIMARY KEY, c1 TEXT, c2 INT)`)
+		i11         = optimism.NewInfo(task, sources[0], upSchema, upTables[0], downSchema, downTable, DDLs1, ti0, []*model.TableInfo{ti1})
+		i12         = optimism.NewInfo(task, sources[0], upSchema, upTables[1], downSchema, downTable, DDLs1, ti0, []*model.TableInfo{ti1})
+		i21         = optimism.NewInfo(task, sources[1], upSchema, upTables[1], downSchema, downTable, DDLs2, ti1, []*model.TableInfo{ti2})
+	)
+
+	rev1, err := optimism.PutInfo(etcdTestCli, i11)
+	c.Assert(err, IsNil)
+	ifm, _, err := optimism.GetAllInfo(etcdTestCli)
+	c.Assert(err, IsNil)
+	infos := sortInfos(ifm)
+	c.Assert(len(infos), Equals, 1)
+	i11.Version = 1
+	i11.Revision = rev1
+	c.Assert(infos[0], DeepEquals, i11)
+
+	rev2, err := optimism.PutInfo(etcdTestCli, i12)
+	c.Assert(err, IsNil)
+	ifm, _, err = optimism.GetAllInfo(etcdTestCli)
+	c.Assert(err, IsNil)
+	infos = sortInfos(ifm)
+	c.Assert(len(infos), Equals, 2)
+	i11.Version = 1
+	i11.Revision = rev1
+	i12.Version = 1
+	i12.Revision = rev2
+	c.Assert(infos[0], DeepEquals, i11)
+	c.Assert(infos[1], DeepEquals, i12)
+
+	rev3, err := optimism.PutInfo(etcdTestCli, i21)
+	c.Assert(err, IsNil)
+	rev4, err := optimism.PutInfo(etcdTestCli, i11)
+	c.Assert(err, IsNil)
+	ifm, _, err = optimism.GetAllInfo(etcdTestCli)
+	c.Assert(err, IsNil)
+	infos = sortInfos(ifm)
+	c.Assert(len(infos), Equals, 3)
+
+	i11.Version = 2
+	i11.Revision = rev4
+	i12.Version = 1
+	i12.Revision = rev2
+	i21.Version = 1
+	i21.Revision = rev3
+	c.Assert(infos[0], DeepEquals, i12)
+	c.Assert(infos[1], DeepEquals, i21)
+	c.Assert(infos[2], DeepEquals, i11)
+}
+
+func (t *testOptimist) TestBuildLockJoinedAndTable(c *C) {
+	defer clearOptimistTestSourceInfoOperation(c)
+
+	var (
+		logger           = log.L()
+		o                = NewOptimist(&logger)
+		task             = "task"
+		source1          = "mysql-replica-1"
+		source2          = "mysql-replica-2"
+		downSchema       = "db"
+		downTable        = "tbl"
+		st1              = optimism.NewSourceTables(task, source1)
+		st2              = optimism.NewSourceTables(task, source2)
+		DDLs1            = []string{"ALTER TABLE bar ADD COLUMN c1 INT"}
+		DDLs2            = []string{"ALTER TABLE bar DROP COLUMN c1"}
+		p                = parser.New()
+		se               = mock.NewContext()
+		tblID      int64 = 111
+		ti0              = createTableInfo(c, p, se, tblID, `CREATE TABLE bar (id INT PRIMARY KEY)`)
+		ti1              = createTableInfo(c, p, se, tblID, `CREATE TABLE bar (id INT PRIMARY KEY, c1 INT)`)
+		ti2              = createTableInfo(c, p, se, tblID, `CREATE TABLE bar (id INT PRIMARY KEY, c1 INT, c2 INT)`)
+		ti3              = createTableInfo(c, p, se, tblID, `CREATE TABLE bar (id INT PRIMARY KEY, c2 INT)`)
+
+		i11 = optimism.NewInfo(task, source1, "foo", "bar-1", downSchema, downTable, DDLs1, ti0, []*model.TableInfo{ti1})
+		i21 = optimism.NewInfo(task, source2, "foo", "bar-1", downSchema, downTable, DDLs2, ti2, []*model.TableInfo{ti3})
+	)
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	st1.AddTable("db", "tbl-1", downSchema, downTable)
+	st2.AddTable("db", "tbl-1", downSchema, downTable)
+
+	c.Assert(o.Start(ctx, etcdTestCli), IsNil)
+	_, err := optimism.PutSourceTables(etcdTestCli, st1)
+	c.Assert(err, IsNil)
+	_, err = optimism.PutSourceTables(etcdTestCli, st2)
+	c.Assert(err, IsNil)
+
+	_, err = optimism.PutInfo(etcdTestCli, i21)
+	c.Assert(err, IsNil)
+	_, err = optimism.PutInfo(etcdTestCli, i11)
+	c.Assert(err, IsNil)
+
+	ifm, _, err := optimism.GetAllInfo(etcdTestCli)
+	c.Assert(err, IsNil)
+
+	lockJoined, lockTTS := o.buildLockJoinedAndTTS(ifm)
+	c.Assert(len(lockJoined), Equals, 1)
+	c.Assert(len(lockTTS), Equals, 1)
+	joined, ok := lockJoined[utils.GenDDLLockID(task, downSchema, downTable)]
+	c.Assert(ok, IsTrue)
+	cmp, err := joined.Compare(schemacmp.Encode(ti2))
+	c.Assert(err, IsNil)
+	c.Assert(cmp, Equals, 0)
+}

errors.toml

@@ -2248,6 +2248,12 @@ description = ""
 workaround = ""
 tags = ["internal", "high"]
 
+[error.DM-dm-master-38055]
+message = "table-info-before not exist in optimistic ddls: %v"
+description = ""
+workaround = ""
+tags = ["internal", "high"]
+
 [error.DM-dm-worker-40001]
 message = "parse dm-worker config flag set"
 description = ""

pkg/shardddl/optimism/info.go

@@ -54,6 +54,10 @@ type Info struct {
 	// only set it when get/watch from etcd
 	Version int64 `json:"-"`
 
+	// only set it when get from etcd
+	// use for sort infos in recoverlock
+	Revision int64 `json:"-"`
+
 	// use to resolve conflict
 	IgnoreConflict bool `json:"ignore-conflict"`
 }
@@ -132,6 +136,7 @@ func GetAllInfo(cli *clientv3.Client) (map[string]map[string]map[string]map[stri
 			return nil, 0, err2
 		}
 		info.Version = kv.Version
+		info.Revision = kv.ModRevision
 
 		if _, ok := ifm[info.Task]; !ok {
 			ifm[info.Task] = make(map[string]map[string]map[string]Info)

pkg/shardddl/optimism/info_test.go

@@ -128,6 +128,7 @@ func (t *testForEtcd) TestInfoEtcd(c *C) {
 	c.Assert(ifm[task1][source1][upSchema], HasLen, 1)
 	i11WithVer := i11
 	i11WithVer.Version = 2
+	i11WithVer.Revision = ifm[task1][source1][upSchema][upTable].Revision
 	c.Assert(ifm[task1][source1][upSchema][upTable], DeepEquals, i11WithVer)
 
 	// put another key and get again with 2 info.
@@ -141,6 +142,7 @@ func (t *testForEtcd) TestInfoEtcd(c *C) {
 	c.Assert(ifm[task1][source1][upSchema][upTable], DeepEquals, i11WithVer)
 	i12WithVer := i12
 	i12WithVer.Version = 1
+	i12WithVer.Revision = ifm[task1][source2][upSchema][upTable].Revision
 	c.Assert(ifm[task1][source2][upSchema][upTable], DeepEquals, i12WithVer)
 
 	// start the watcher.
@@ -210,8 +212,10 @@ func (t *testForEtcd) TestInfoEtcd(c *C) {
 	c.Assert(ifm, HasKey, task1)
 	c.Assert(ifm, HasKey, task2)
 	c.Assert(ifm[task1], HasLen, 1)
+	i11WithVer.Revision = ifm[task1][source1][upSchema][upTable].Revision
 	c.Assert(ifm[task1][source1][upSchema][upTable], DeepEquals, i11WithVer)
 	c.Assert(ifm[task2], HasLen, 1)
+	i21WithVer.Revision = ifm[task2][source1][upSchema][upTable].Revision
 	c.Assert(ifm[task2][source1][upSchema][upTable], DeepEquals, i21WithVer)
 
 	// watch the deletion for i12.