puller(ticdc): always split update kv entries in sink safe mode (#11224)

close #11231

cdc/processor/processor.go

@@ -43,6 +43,7 @@ import (
 	"github.com/pingcap/tiflow/pkg/pdutil"
 	"github.com/pingcap/tiflow/pkg/retry"
 	"github.com/pingcap/tiflow/pkg/sink"
+	"github.com/pingcap/tiflow/pkg/sink/mysql"
 	"github.com/pingcap/tiflow/pkg/upstream"
 	"github.com/pingcap/tiflow/pkg/util"
 	"github.com/prometheus/client_golang/prometheus"
@@ -598,6 +599,35 @@ func isMysqlCompatibleBackend(sinkURIStr string) (bool, error) {
 	return sink.IsMySQLCompatibleScheme(scheme), nil
 }
 
+// getPullerSplitUpdateMode returns how to split update kv entries at puller.
+//
+// If the sinkURI is not mysql compatible, it returns PullerSplitUpdateModeNone
+// which means don't split any update kv entries at puller;
+// If the sinkURI is mysql compatible, it has the following two cases:
+//  1. if the user config safe mode in sink module, it returns PullerSplitUpdateModeAlways,
+//     which means split all update kv entries at puller;
+//  2. if the user does not config safe mode in sink module, it returns PullerSplitUpdateModeAtStart,
+//     which means split update kv entries whose commitTS is older than the replicate ts of sink.
+func getPullerSplitUpdateMode(sinkURIStr string, config *config.ReplicaConfig) (sourcemanager.PullerSplitUpdateMode, error) {
+	sinkURI, err := url.Parse(sinkURIStr)
+	if err != nil {
+		return sourcemanager.PullerSplitUpdateModeNone, cerror.WrapError(cerror.ErrSinkURIInvalid, err)
+	}
+	scheme := sink.GetScheme(sinkURI)
+	if !sink.IsMySQLCompatibleScheme(scheme) {
+		return sourcemanager.PullerSplitUpdateModeNone, nil
+	}
+	// must be mysql sink
+	isSinkInSafeMode, err := mysql.IsSinkSafeMode(sinkURI, config)
+	if err != nil {
+		return sourcemanager.PullerSplitUpdateModeNone, err
+	}
+	if isSinkInSafeMode {
+		return sourcemanager.PullerSplitUpdateModeAlways, nil
+	}
+	return sourcemanager.PullerSplitUpdateModeAtStart, nil
+}
+
 // lazyInitImpl create Filter, SchemaStorage, Mounter instances at the first tick.
 func (p *processor) lazyInitImpl(etcdCtx context.Context) (err error) {
 	if p.initialized.Load() {
@@ -657,19 +687,23 @@ func (p *processor) lazyInitImpl(etcdCtx context.Context) (err error) {
 		return errors.Trace(err)
 	}
 
-	isMysqlBackend, err := isMysqlCompatibleBackend(p.latestInfo.SinkURI)
+	pullerSplitUpdateMode, err := getPullerSplitUpdateMode(p.latestInfo.SinkURI, cfConfig)
 	if err != nil {
 		return errors.Trace(err)
 	}
 	p.sourceManager.r = sourcemanager.New(
 		p.changefeedID, p.upstream, p.mg.r,
-		sortEngine, util.GetOrZero(cfConfig.BDRMode),
-		util.GetOrZero(cfConfig.EnableTableMonitor),
-		isMysqlBackend)
+		sortEngine, pullerSplitUpdateMode,
+		util.GetOrZero(cfConfig.BDRMode),
+		util.GetOrZero(cfConfig.EnableTableMonitor))
 	p.sourceManager.name = "SourceManager"
 	p.sourceManager.changefeedID = p.changefeedID
 	p.sourceManager.spawn(prcCtx)
 
+	isMysqlBackend, err := isMysqlCompatibleBackend(p.latestInfo.SinkURI)
+	if err != nil {
+		return errors.Trace(err)
+	}
 	p.sinkManager.r = sinkmanager.New(
 		p.changefeedID, p.latestInfo.SinkURI, cfConfig, p.upstream,
 		p.ddlHandler.r.schemaStorage, p.redo.r, p.sourceManager.r, isMysqlBackend)

cdc/processor/processor_test.go

@@ -29,6 +29,7 @@ import (
 	"github.com/pingcap/tiflow/cdc/entry/schema"
 	"github.com/pingcap/tiflow/cdc/model"
 	"github.com/pingcap/tiflow/cdc/processor/sinkmanager"
+	"github.com/pingcap/tiflow/cdc/processor/sourcemanager"
 	"github.com/pingcap/tiflow/cdc/processor/tablepb"
 	"github.com/pingcap/tiflow/cdc/redo"
 	"github.com/pingcap/tiflow/cdc/scheduler"
@@ -41,6 +42,7 @@ import (
 	redoPkg "github.com/pingcap/tiflow/pkg/redo"
 	"github.com/pingcap/tiflow/pkg/spanz"
 	"github.com/pingcap/tiflow/pkg/upstream"
+	"github.com/pingcap/tiflow/pkg/util"
 	"github.com/stretchr/testify/require"
 )
 
@@ -803,3 +805,73 @@ func TestProcessorNotInitialized(t *testing.T) {
 	p, _, _ := initProcessor4Test(t, &liveness, false, globalVars, changefeedVars)
 	require.Nil(t, p.WriteDebugInfo(os.Stdout))
 }
+
+func TestGetPullerSplitUpdateMode(t *testing.T) {
+	testCases := []struct {
+		sinkURI string
+		config  *config.ReplicaConfig
+		mode    sourcemanager.PullerSplitUpdateMode
+	}{
+		{
+			sinkURI: "kafka://127.0.0.1:9092/ticdc-test2",
+			config:  nil,
+			mode:    sourcemanager.PullerSplitUpdateModeNone,
+		},
+		{
+			sinkURI: "mysql://root:test@127.0.0.1:3306/",
+			config:  nil,
+			mode:    sourcemanager.PullerSplitUpdateModeAtStart,
+		},
+		{
+			sinkURI: "mysql://root:test@127.0.0.1:3306/?safe-mode=true",
+			config:  nil,
+			mode:    sourcemanager.PullerSplitUpdateModeAlways,
+		},
+		{
+			sinkURI: "mysql://root:test@127.0.0.1:3306/?safe-mode=false",
+			config:  nil,
+			mode:    sourcemanager.PullerSplitUpdateModeAtStart,
+		},
+		{
+			sinkURI: "mysql://root:test@127.0.0.1:3306/",
+			config: &config.ReplicaConfig{
+				Sink: &config.SinkConfig{
+					SafeMode: util.AddressOf(true),
+				},
+			},
+			mode: sourcemanager.PullerSplitUpdateModeAlways,
+		},
+		{
+			sinkURI: "mysql://root:test@127.0.0.1:3306/",
+			config: &config.ReplicaConfig{
+				Sink: &config.SinkConfig{
+					SafeMode: util.AddressOf(false),
+				},
+			},
+			mode: sourcemanager.PullerSplitUpdateModeAtStart,
+		},
+		{
+			sinkURI: "mysql://root:test@127.0.0.1:3306/?safe-mode=true",
+			config: &config.ReplicaConfig{
+				Sink: &config.SinkConfig{
+					SafeMode: util.AddressOf(false),
+				},
+			},
+			mode: sourcemanager.PullerSplitUpdateModeAlways,
+		},
+		{
+			sinkURI: "mysql://root:test@127.0.0.1:3306/?safe-mode=false",
+			config: &config.ReplicaConfig{
+				Sink: &config.SinkConfig{
+					SafeMode: util.AddressOf(true),
+				},
+			},
+			mode: sourcemanager.PullerSplitUpdateModeAlways,
+		},
+	}
+	for _, tc := range testCases {
+		mode, err := getPullerSplitUpdateMode(tc.sinkURI, tc.config)
+		require.Nil(t, err)
+		require.Equal(t, tc.mode, mode)
+	}
+}

cdc/processor/sourcemanager/manager.go

@@ -35,6 +35,16 @@ import (
 
 const defaultMaxBatchSize = 256
 
+// PullerSplitUpdateMode is the mode to split update events in puller.
+type PullerSplitUpdateMode int32
+
+// PullerSplitUpdateMode constants.
+const (
+	PullerSplitUpdateModeNone    PullerSplitUpdateMode = 0
+	PullerSplitUpdateModeAtStart PullerSplitUpdateMode = 1
+	PullerSplitUpdateModeAlways  PullerSplitUpdateMode = 2
+)
+
 // SourceManager is the manager of the source engine and puller.
 type SourceManager struct {
 	ready chan struct{}
@@ -51,7 +61,7 @@ type SourceManager struct {
 	// Used to indicate whether the changefeed is in BDR mode.
 	bdrMode bool
 
-	safeModeAtStart bool
+	splitUpdateMode PullerSplitUpdateMode
 
 	enableTableMonitor bool
 	puller             *puller.MultiplexingPuller
@@ -63,11 +73,11 @@ func New(
 	up *upstream.Upstream,
 	mg entry.MounterGroup,
 	engine sorter.SortEngine,
+	splitUpdateMode PullerSplitUpdateMode,
 	bdrMode bool,
 	enableTableMonitor bool,
-	safeModeAtStart bool,
 ) *SourceManager {
-	return newSourceManager(changefeedID, up, mg, engine, bdrMode, enableTableMonitor, safeModeAtStart)
+	return newSourceManager(changefeedID, up, mg, engine, splitUpdateMode, bdrMode, enableTableMonitor)
 }
 
 // NewForTest creates a new source manager for testing.
@@ -97,19 +107,19 @@ func newSourceManager(
 	up *upstream.Upstream,
 	mg entry.MounterGroup,
 	engine sorter.SortEngine,
+	splitUpdateMode PullerSplitUpdateMode,
 	bdrMode bool,
 	enableTableMonitor bool,
-	safeModeAtStart bool,
 ) *SourceManager {
 	mgr := &SourceManager{
 		ready:              make(chan struct{}),
 		changefeedID:       changefeedID,
 		up:                 up,
 		mg:                 mg,
 		engine:             engine,
+		splitUpdateMode:    splitUpdateMode,
 		bdrMode:            bdrMode,
 		enableTableMonitor: enableTableMonitor,
-		safeModeAtStart:    safeModeAtStart,
 	}
 
 	serverConfig := config.GetGlobalServerConfig()
@@ -164,7 +174,21 @@ func (m *SourceManager) AddTable(span tablepb.Span, tableName string, startTs mo
 	m.engine.AddTable(span, startTs)
 
 	shouldSplitKVEntry := func(raw *model.RawKVEntry) bool {
-		return m.safeModeAtStart && isOldUpdateKVEntry(raw, getReplicaTs)
+		if raw == nil || !raw.IsUpdate() {
+			return false
+		}
+		switch m.splitUpdateMode {
+		case PullerSplitUpdateModeNone:
+			return false
+		case PullerSplitUpdateModeAlways:
+			return true
+		case PullerSplitUpdateModeAtStart:
+			return isOldUpdateKVEntry(raw, getReplicaTs)
+		default:
+			log.Panic("Unknown split update mode", zap.Int32("mode", int32(m.splitUpdateMode)))
+		}
+		log.Panic("Shouldn't reach here")
+		return false
 	}
 
 	// Only nil in unit tests.

pkg/sink/mysql/config.go

@@ -223,31 +223,58 @@ func mergeConfig(
 	urlParameters *urlConfig,
 ) (*urlConfig, error) {
 	dest := &urlConfig{}
-	dest.SafeMode = replicaConfig.Sink.SafeMode
-	if replicaConfig.Sink != nil && replicaConfig.Sink.MySQLConfig != nil {
-		mConfig := replicaConfig.Sink.MySQLConfig
-		dest.WorkerCount = mConfig.WorkerCount
-		dest.MaxTxnRow = mConfig.MaxTxnRow
-		dest.MaxMultiUpdateRowCount = mConfig.MaxMultiUpdateRowCount
-		dest.MaxMultiUpdateRowSize = mConfig.MaxMultiUpdateRowSize
-		dest.TiDBTxnMode = mConfig.TiDBTxnMode
-		dest.SSLCa = mConfig.SSLCa
-		dest.SSLCert = mConfig.SSLCert
-		dest.SSLKey = mConfig.SSLKey
-		dest.TimeZone = mConfig.TimeZone
-		dest.WriteTimeout = mConfig.WriteTimeout
-		dest.ReadTimeout = mConfig.ReadTimeout
-		dest.Timeout = mConfig.Timeout
-		dest.EnableBatchDML = mConfig.EnableBatchDML
-		dest.EnableMultiStatement = mConfig.EnableMultiStatement
-		dest.EnableCachePreparedStatement = mConfig.EnableCachePreparedStatement
+	if replicaConfig != nil && replicaConfig.Sink != nil {
+		dest.SafeMode = replicaConfig.Sink.SafeMode
+		if replicaConfig.Sink.MySQLConfig != nil {
+			mConfig := replicaConfig.Sink.MySQLConfig
+			dest.WorkerCount = mConfig.WorkerCount
+			dest.MaxTxnRow = mConfig.MaxTxnRow
+			dest.MaxMultiUpdateRowCount = mConfig.MaxMultiUpdateRowCount
+			dest.MaxMultiUpdateRowSize = mConfig.MaxMultiUpdateRowSize
+			dest.TiDBTxnMode = mConfig.TiDBTxnMode
+			dest.SSLCa = mConfig.SSLCa
+			dest.SSLCert = mConfig.SSLCert
+			dest.SSLKey = mConfig.SSLKey
+			dest.TimeZone = mConfig.TimeZone
+			dest.WriteTimeout = mConfig.WriteTimeout
+			dest.ReadTimeout = mConfig.ReadTimeout
+			dest.Timeout = mConfig.Timeout
+			dest.EnableBatchDML = mConfig.EnableBatchDML
+			dest.EnableMultiStatement = mConfig.EnableMultiStatement
+			dest.EnableCachePreparedStatement = mConfig.EnableCachePreparedStatement
+		}
 	}
 	if err := mergo.Merge(dest, urlParameters, mergo.WithOverride); err != nil {
 		return nil, cerror.WrapError(cerror.ErrMySQLInvalidConfig, err)
 	}
 	return dest, nil
 }
 
+// IsSinkSafeMode returns whether the sink is in safe mode.
+func IsSinkSafeMode(sinkURI *url.URL, replicaConfig *config.ReplicaConfig) (bool, error) {
+	if sinkURI == nil {
+		return false, cerror.ErrMySQLInvalidConfig.GenWithStack("fail to open MySQL sink, empty SinkURI")
+	}
+
+	scheme := strings.ToLower(sinkURI.Scheme)
+	if !sink.IsMySQLCompatibleScheme(scheme) {
+		return false, cerror.ErrMySQLInvalidConfig.GenWithStack("can't create MySQL sink with unsupported scheme: %s", scheme)
+	}
+	req := &http.Request{URL: sinkURI}
+	urlParameter := &urlConfig{}
+	if err := binding.Query.Bind(req, urlParameter); err != nil {
+		return false, cerror.WrapError(cerror.ErrMySQLInvalidConfig, err)
+	}
+	var err error
+	if urlParameter, err = mergeConfig(replicaConfig, urlParameter); err != nil {
+		return false, err
+	}
+	if urlParameter.SafeMode == nil {
+		return defaultSafeMode, nil
+	}
+	return *urlParameter.SafeMode, nil
+}
+
 func getWorkerCount(values *urlConfig, workerCount *int) error {
 	if values.WorkerCount == nil {
 		return nil