syncer(dm): implement start-task --start-time (pingcap#4485)

close pingcap#4106

dm/_utils/terror_gen/errors_release.txt

@@ -186,6 +186,7 @@ ErrConfigInvalidLoadMode,[code=20053:class=config:scope=internal:level=medium],
 ErrConfigInvalidDuplicateResolution,[code=20054:class=config:scope=internal:level=medium], "Message: invalid load on-duplicate '%s', Workaround: Please choose a valid value in ['replace', 'error', 'ignore']"
 ErrConfigValidationMode,[code=20055:class=config:scope=internal:level=high], "Message: invalid validation mode, Workaround: Please check `validation-mode` config in task configuration file."
 ErrContinuousValidatorCfgNotFound,[code=20056:class=config:scope=internal:level=medium], "Message: mysql-instance(%d)'s continuous validator config %s not exist, Workaround: Please check the `continuous-validator-config-name` config in task configuration file."
+ErrConfigStartTimeTooLate,[code=20057:class=config:scope=internal:level=high], "Message: start-time %s is too late, no binlog location matches it, Workaround: Please check the `--start-time` is expected or try again later."
 ErrBinlogExtractPosition,[code=22001:class=binlog-op:scope=internal:level=high]
 ErrBinlogInvalidFilename,[code=22002:class=binlog-op:scope=internal:level=high], "Message: invalid binlog filename"
 ErrBinlogParsePosFromStr,[code=22003:class=binlog-op:scope=internal:level=high]

dm/dm/config/task.go

@@ -514,7 +514,14 @@ const (
 	validatorIdx
 )
 
-// adjust adjusts and verifies config.
+// Adjust adjusts and verifies config.
+func (c *TaskConfig) Adjust() error {
+	if c == nil {
+		return terror.ErrConfigYamlTransform.New("task config is nil")
+	}
+	return c.adjust()
+}
+
 func (c *TaskConfig) adjust() error {
 	if len(c.Name) == 0 {
 		return terror.ErrConfigNeedUniqueTaskName.Generate()

dm/dm/config/task_cli_args.go

@@ -20,6 +20,11 @@ import (
 	"github.com/pingcap/tiflow/dm/pkg/terror"
 )
 
+const (
+	StartTimeFormat  = "2006-01-02 15:04:05"
+	StartTimeFormat2 = "2006-01-02T15:04:05"
+)
+
 // TaskCliArgs is the task command line arguments, these arguments have higher priority than the config file and
 // downstream checkpoint, but may need to be removed after the first time they take effect.
 type TaskCliArgs struct {
@@ -46,10 +51,10 @@ func (t *TaskCliArgs) Verify() error {
 	if t.StartTime == "" {
 		return nil
 	}
-	_, err := time.Parse("2006-01-02 15:04:05", t.StartTime)
+	_, err := time.Parse(StartTimeFormat, t.StartTime)
 	if err == nil {
 		return nil
 	}
-	_, err = time.Parse("2006-01-02T15:04:05", t.StartTime)
-	return terror.Annotate(err, "error while parse start-time, expected in the format like '2006-01-02 15:04:05'")
+	_, err = time.Parse(StartTimeFormat2, t.StartTime)
+	return terror.Annotate(err, "error while parse start-time, expected in the format like '2006-01-02 15:04:05' or '2006-01-02T15:04:05'")
 }

dm/dm/master/server.go

@@ -48,6 +48,7 @@ import (
 	"github.com/pingcap/tiflow/dm/dm/master/workerrpc"
 	"github.com/pingcap/tiflow/dm/dm/pb"
 	"github.com/pingcap/tiflow/dm/dm/unit"
+	"github.com/pingcap/tiflow/dm/pkg/binlog"
 	"github.com/pingcap/tiflow/dm/pkg/conn"
 	tcontext "github.com/pingcap/tiflow/dm/pkg/context"
 	"github.com/pingcap/tiflow/dm/pkg/cputil"
@@ -1545,14 +1546,21 @@ func (s *Server) generateSubTask(
 	task string,
 	cliArgs *config.TaskCliArgs,
 ) (*config.TaskConfig, []*config.SubTaskConfig, error) {
+	var err error
 	cfg := config.NewTaskConfig()
 	// bypass the meta check by set any value. If start-time is specified, DM-worker will not use meta field.
 	if cliArgs != nil && cliArgs.StartTime != "" {
+		err = cfg.RawDecode(task)
+		if err != nil {
+			return nil, nil, terror.WithClass(err, terror.ClassDMMaster)
+		}
 		for _, inst := range cfg.MySQLInstances {
-			inst.Meta = &config.Meta{BinLogName: cliArgs.StartTime}
+			inst.Meta = &config.Meta{BinLogName: binlog.FakeBinlogName}
 		}
+		err = cfg.Adjust()
+	} else {
+		err = cfg.Decode(task)
 	}
-	err := cfg.Decode(task)
 	if err != nil {
 		return nil, nil, terror.WithClass(err, terror.ClassDMMaster)
 	}

dm/dm/worker/source_worker.go

@@ -551,7 +551,7 @@ func (w *SourceWorker) StartSubTask(cfg *config.SubTaskConfig, expectStage, vali
 	}
 
 	// directly put cfg into subTaskHolder
-	// the unique of subtask should be assured by etcd
+	// the uniqueness of subtask should be assured by etcd
 	st := NewSubTask(cfg, w.etcdClient, w.name)
 	w.subTaskHolder.recordSubTask(st)
 	if w.closed.Load() {

dm/errors.toml

@@ -1126,6 +1126,12 @@ description = ""
 workaround = "Please check the `continuous-validator-config-name` config in task configuration file."
 tags = ["internal", "medium"]
 
+[error.DM-config-20057]
+message = "start-time %s is too late, no binlog location matches it"
+description = ""
+workaround = "Please check the `--start-time` is expected or try again later."
+tags = ["internal", "high"]
+
 [error.DM-binlog-op-22001]
 message = ""
 description = ""

dm/pkg/binlog/pos_finder.go

@@ -30,6 +30,9 @@ import (
 	"github.com/pingcap/tiflow/dm/pkg/utils"
 )
 
+// FakeBinlogName is used to bypass the checking of meta in task config when start-task with --start-time.
+const FakeBinlogName = "start-task with --start-time"
+
 type binlogPosFinder struct {
 	remote     bool
 	tctx       *tcontext.Context

dm/pkg/terror/error_list.go

@@ -251,6 +251,7 @@ const (
 	codeConfigInvalidLoadDuplicateResolution
 	codeConfigValidationMode
 	codeContinuousValidatorCfgNotFound
+	codeConfigStartTimeTooLate
 )
 
 // Binlog operation error code list.
@@ -914,6 +915,7 @@ var (
 	ErrConfigInvalidDuplicateResolution    = New(codeConfigInvalidLoadDuplicateResolution, ClassConfig, ScopeInternal, LevelMedium, "invalid load on-duplicate '%s'", "Please choose a valid value in ['replace', 'error', 'ignore']")
 	ErrConfigValidationMode                = New(codeConfigValidationMode, ClassConfig, ScopeInternal, LevelHigh, "invalid validation mode", "Please check `validation-mode` config in task configuration file.")
 	ErrContinuousValidatorCfgNotFound      = New(codeContinuousValidatorCfgNotFound, ClassConfig, ScopeInternal, LevelMedium, "mysql-instance(%d)'s continuous validator config %s not exist", "Please check the `continuous-validator-config-name` config in task configuration file.")
+	ErrConfigStartTimeTooLate              = New(codeConfigStartTimeTooLate, ClassConfig, ScopeInternal, LevelHigh, "start-time %s is too late, no binlog location matches it", "Please check the `--start-time` is expected or try again later.")
 
 	// Binlog operation error.
 	ErrBinlogExtractPosition = New(codeBinlogExtractPosition, ClassBinlogOp, ScopeInternal, LevelHigh, "", "")

dm/syncer/checkpoint.go

@@ -25,6 +25,7 @@ import (
 	"time"
 
 	"github.com/pingcap/errors"
+
 	"github.com/pingcap/tiflow/dm/dm/config"
 	"github.com/pingcap/tiflow/dm/pkg/binlog"
 	"github.com/pingcap/tiflow/dm/pkg/conn"
@@ -227,6 +228,9 @@ type CheckPoint interface {
 	// DeleteTablePoint deletes checkpoint for specified table in memory and storage
 	DeleteTablePoint(tctx *tcontext.Context, table *filter.Table) error
 
+	// DeleteAllTablePoint deletes all checkpoints for table in memory and storage
+	DeleteAllTablePoint(tctx *tcontext.Context) error
+
 	// DeleteSchemaPoint deletes checkpoint for specified schema
 	DeleteSchemaPoint(tctx *tcontext.Context, sourceSchema string) error
 
@@ -237,10 +241,13 @@ type CheckPoint interface {
 	// corresponding to Meta.Save
 	SaveGlobalPoint(point binlog.Location)
 
+	// SaveGlobalPointForcibly saves the global binlog stream's checkpoint forcibly.
+	SaveGlobalPointForcibly(location binlog.Location)
+
 	// Snapshot make a snapshot of current checkpoint
 	Snapshot(isSyncFlush bool) *SnapshotInfo
 
-	// FlushGlobalPointsExcept flushes the global checkpoint and tables'
+	// FlushPointsExcept flushes the global checkpoint and tables'
 	// checkpoints except exceptTables, it also flushes SQLs with Args providing
 	// by extraSQLs and extraArgs. Currently extraSQLs contain shard meta only.
 	// @exceptTables: [[schema, table]... ]
@@ -551,6 +558,26 @@ func (cp *RemoteCheckPoint) DeleteTablePoint(tctx *tcontext.Context, table *filt
 	return nil
 }
 
+// DeleteAllTablePoint implements CheckPoint.DeleteAllTablePoint.
+func (cp *RemoteCheckPoint) DeleteAllTablePoint(tctx *tcontext.Context) error {
+	cp.Lock()
+	defer cp.Unlock()
+
+	tctx2, cancel := tctx.WithContext(context.Background()).WithTimeout(maxDMLConnectionDuration)
+	defer cancel()
+	cp.logCtx.L().Info("delete all table checkpoint")
+	_, err := cp.dbConn.ExecuteSQL(
+		tctx2,
+		[]string{`DELETE FROM ` + cp.tableName + ` WHERE id = ? AND is_global = ?`},
+		[]interface{}{cp.id, false},
+	)
+	if err != nil {
+		return err
+	}
+	cp.points = make(map[string]map[string]*binlogPoint)
+	return nil
+}
+
 // DeleteSchemaPoint implements CheckPoint.DeleteSchemaPoint.
 func (cp *RemoteCheckPoint) DeleteSchemaPoint(tctx *tcontext.Context, sourceSchema string) error {
 	cp.Lock()
@@ -614,7 +641,16 @@ func (cp *RemoteCheckPoint) SaveGlobalPoint(location binlog.Location) {
 	}
 }
 
-// FlushPointsExcept implements CheckPoint.FlushSnapshotPointsExcept.
+// SaveGlobalPointForcibly implements CheckPoint.SaveGlobalPointForcibly.
+func (cp *RemoteCheckPoint) SaveGlobalPointForcibly(location binlog.Location) {
+	cp.Lock()
+	defer cp.Unlock()
+
+	cp.logCtx.L().Info("reset global checkpoint", zap.Stringer("location", location))
+	cp.globalPoint = newBinlogPoint(location, binlog.NewLocation(cp.cfg.Flavor), nil, nil, cp.cfg.EnableGTID)
+}
+
+// FlushPointsExcept implements CheckPoint.FlushPointsExcept.
 func (cp *RemoteCheckPoint) FlushPointsExcept(
 	tctx *tcontext.Context,
 	snapshotID int,

dm/syncer/syncer.go

@@ -125,6 +125,7 @@ type Syncer struct {
 
 	cfg     *config.SubTaskConfig
 	syncCfg replication.BinlogSyncerConfig
+	cliArgs *config.TaskCliArgs
 
 	sgk       *ShardingGroupKeeper // keeper to keep all sharding (sub) group in this syncer
 	pessimist *shardddl.Pessimist  // shard DDL pessimist
@@ -439,11 +440,13 @@ func (s *Syncer) Init(ctx context.Context) (err error) {
 	}
 
 	// when Init syncer, set active relay log info
-	err = s.setInitActiveRelayLog(ctx)
-	if err != nil {
-		return err
+	if s.cfg.Meta == nil || s.cfg.Meta.BinLogName != binlog.FakeBinlogName {
+		err = s.setInitActiveRelayLog(ctx)
+		if err != nil {
+			return err
+		}
+		rollbackHolder.Add(fr.FuncRollback{Name: "remove-active-realylog", Fn: s.removeActiveRelayLog})
 	}
-	rollbackHolder.Add(fr.FuncRollback{Name: "remove-active-realylog", Fn: s.removeActiveRelayLog})
 
 	s.reset()
 	return nil
@@ -1257,6 +1260,17 @@ func (s *Syncer) afterFlushCheckpoint(task *checkpointFlushTask) error {
 	s.lastCheckpointFlushedTime = now
 
 	s.logAndClearFilteredStatistics()
+
+	if s.cliArgs != nil && s.cliArgs.StartTime != "" {
+		clone := *s.cliArgs
+		clone.StartTime = ""
+		err2 := ha.PutTaskCliArgs(s.cli, s.cfg.Name, []string{s.cfg.SourceID}, clone)
+		if err2 != nil {
+			s.tctx.L().Error("failed to clean start-time in task cli args", zap.Error(err2))
+		} else {
+			s.cliArgs.StartTime = ""
+		}
+	}
 	return nil
 }
 
@@ -1477,11 +1491,30 @@ func (s *Syncer) Run(ctx context.Context) (err error) {
 		}
 	}()
 
-	// some initialization that can't be put in Syncer.Init
 	fresh, err := s.IsFreshTask(runCtx)
 	if err != nil {
 		return err
-	} else if fresh {
+	}
+
+	// task command line arguments have the highest priority
+	// dm-syncer and other usage may not have a etcdCli, so we check it first
+	skipLoadMeta := false
+	if s.cli != nil {
+		s.cliArgs, err = ha.GetTaskCliArgs(s.cli, s.cfg.Name, s.cfg.SourceID)
+		if err != nil {
+			s.tctx.L().Error("failed to get task cli args", zap.Error(err))
+		}
+		if s.cliArgs != nil && s.cliArgs.StartTime != "" {
+			err = s.setGlobalPointByTime(tctx, s.cliArgs.StartTime)
+			if terror.ErrConfigStartTimeTooLate.Equal(err) {
+				return err
+			}
+			skipLoadMeta = err == nil
+		}
+	}
+
+	// some initialization that can't be put in Syncer.Init
+	if fresh && !skipLoadMeta {
 		// for fresh task, we try to load checkpoints from meta (file or config item)
 		err = s.checkpoint.LoadMeta()
 		if err != nil {
@@ -3636,7 +3669,8 @@ func (s *Syncer) adjustGlobalPointGTID(tctx *tcontext.Context) (bool, error) {
 	// 1. GTID is not enabled
 	// 2. location already has GTID position
 	// 3. location is totally new, has no position info
-	if !s.cfg.EnableGTID || location.GTIDSetStr() != "" || location.Position.Name == "" {
+	// 4. location is too early thus not a COMMIT location, which happens when it's reset by other logic
+	if !s.cfg.EnableGTID || location.GTIDSetStr() != "" || location.Position.Name == "" || location.Position.Pos == 4 {
 		return false, nil
 	}
 	// set enableGTID to false for new streamerController
@@ -3728,3 +3762,58 @@ func (s *Syncer) flushOptimisticTableInfos(tctx *tcontext.Context) {
 		tctx.L().Error("failed to flush table points with table infos", log.ShortError(err))
 	}
 }
+
+func (s *Syncer) setGlobalPointByTime(tctx *tcontext.Context, timeStr string) error {
+	// we support two layout
+	t, err := time.ParseInLocation(config.StartTimeFormat, timeStr, s.timezone)
+	if err != nil {
+		t, err = time.ParseInLocation(config.StartTimeFormat2, timeStr, s.timezone)
+	}
+	if err != nil {
+		return err
+	}
+
+	var (
+		loc   *binlog.Location
+		posTp binlog.PosType
+	)
+
+	if s.relay != nil {
+		subDir := s.relay.Status(nil).(*pb.RelayStatus).RelaySubDir
+		relayDir := path.Join(s.cfg.RelayDir, subDir)
+		finder := binlog.NewLocalBinlogPosFinder(tctx, s.cfg.EnableGTID, s.cfg.Flavor, relayDir)
+		loc, posTp, err = finder.FindByTimestamp(t.Unix())
+	} else {
+		finder := binlog.NewRemoteBinlogPosFinder(tctx, s.fromDB.BaseDB.DB, s.syncCfg, s.cfg.EnableGTID)
+		loc, posTp, err = finder.FindByTimestamp(t.Unix())
+	}
+	if err != nil {
+		s.tctx.L().Error("fail to find binlog position by timestamp",
+			zap.Time("time", t),
+			zap.Error(err))
+		return err
+	}
+
+	switch posTp {
+	case binlog.InRangeBinlogPos:
+		s.tctx.L().Info("find binlog position by timestamp",
+			zap.String("time", timeStr),
+			zap.Stringer("pos", loc))
+	case binlog.BelowLowerBoundBinlogPos:
+		s.tctx.L().Warn("fail to find binlog location by timestamp because the timestamp is too early, will use the earliest binlog location",
+			zap.String("time", timeStr),
+			zap.Any("location", loc))
+	case binlog.AboveUpperBoundBinlogPos:
+		return terror.ErrConfigStartTimeTooLate.Generate(timeStr)
+	}
+
+	err = s.checkpoint.DeleteAllTablePoint(tctx)
+	if err != nil {
+		return err
+	}
+	s.checkpoint.SaveGlobalPointForcibly(*loc)
+	s.tctx.L().Info("Will replicate from the specified time, the location recorded in checkpoint and config file will be ignored",
+		zap.String("time", timeStr),
+		zap.Any("locationOfTheTime", loc))
+	return nil
+}

dm/tests/duplicate_event/run.sh

@@ -76,6 +76,7 @@ function run_with_prepared_source_config() {
 
 	server_uuid=$(tail -n 1 $WORK_DIR/worker2/relay-dir/server-uuid.index)
 	relay_log_size=$(ls -al $WORK_DIR/worker2/relay-dir/$server_uuid/$binlog_file | awk '{print $5}')
+	echo "binlog_pos: $binlog_pos relay_log_size: $relay_log_size"
 	[ "$binlog_pos" -eq "$relay_log_size" ]
 
 	echo "============== run_with_prepared_source_config success ==================="

dm/tests/start_task/conf/dm-worker2.toml

@@ -0,0 +1,2 @@
+name = "worker2"
+join = "127.0.0.1:8261"