pkg/config, sink(ticdc): support output raw change event for mq and cloud storage sink

cdc/api/v2/model.go

@@ -317,6 +317,7 @@
 				BasicPassword:           c.Sink.PulsarConfig.BasicPassword,
 				AuthTLSCertificatePath:  c.Sink.PulsarConfig.AuthTLSCertificatePath,
 				AuthTLSPrivateKeyPath:   c.Sink.PulsarConfig.AuthTLSPrivateKeyPath,
+				OutputRawChangeEvent:    c.Sink.PulsarConfig.OutputRawChangeEvent,
 			}
 			if c.Sink.PulsarConfig.OAuth2 != nil {
 				pulsarConfig.OAuth2 = &config.OAuth2{
@@ -402,6 +403,7 @@
 				CodecConfig:                  codeConfig,
 				LargeMessageHandle:           largeMessageHandle,
 				GlueSchemaRegistryConfig:     glueSchemaRegistryConfig,
+				OutputRawChangeEvent:         c.Sink.KafkaConfig.OutputRawChangeEvent,
 			}
 		}
 		var mysqlConfig *config.MySQLConfig
@@ -427,13 +429,14 @@
 		var cloudStorageConfig *config.CloudStorageConfig
 		if c.Sink.CloudStorageConfig != nil {
 			cloudStorageConfig = &config.CloudStorageConfig{
-				WorkerCount:         c.Sink.CloudStorageConfig.WorkerCount,
-				FlushInterval:       c.Sink.CloudStorageConfig.FlushInterval,
-				FileSize:            c.Sink.CloudStorageConfig.FileSize,
-				OutputColumnID:      c.Sink.CloudStorageConfig.OutputColumnID,
-				FileExpirationDays:  c.Sink.CloudStorageConfig.FileExpirationDays,
-				FileCleanupCronSpec: c.Sink.CloudStorageConfig.FileCleanupCronSpec,
-				FlushConcurrency:    c.Sink.CloudStorageConfig.FlushConcurrency,
+				WorkerCount:          c.Sink.CloudStorageConfig.WorkerCount,
+				FlushInterval:        c.Sink.CloudStorageConfig.FlushInterval,
+				FileSize:             c.Sink.CloudStorageConfig.FileSize,
+				OutputColumnID:       c.Sink.CloudStorageConfig.OutputColumnID,
+				FileExpirationDays:   c.Sink.CloudStorageConfig.FileExpirationDays,
+				FileCleanupCronSpec:  c.Sink.CloudStorageConfig.FileCleanupCronSpec,
+				FlushConcurrency:     c.Sink.CloudStorageConfig.FlushConcurrency,
+				OutputRawChangeEvent: c.Sink.CloudStorageConfig.OutputRawChangeEvent,
 			}
 		}
 		var debeziumConfig *config.DebeziumConfig
@@ -666,6 +669,7 @@
 				CodecConfig:                  codeConfig,
 				LargeMessageHandle:           largeMessageHandle,
 				GlueSchemaRegistryConfig:     glueSchemaRegistryConfig,
+				OutputRawChangeEvent:         cloned.Sink.KafkaConfig.OutputRawChangeEvent,
 			}
 		}
 		var mysqlConfig *MySQLConfig
@@ -708,6 +712,7 @@
 				BasicPassword:           cloned.Sink.PulsarConfig.BasicPassword,
 				AuthTLSCertificatePath:  cloned.Sink.PulsarConfig.AuthTLSCertificatePath,
 				AuthTLSPrivateKeyPath:   cloned.Sink.PulsarConfig.AuthTLSPrivateKeyPath,
+				OutputRawChangeEvent:    cloned.Sink.PulsarConfig.OutputRawChangeEvent,
 			}
 			if cloned.Sink.PulsarConfig.OAuth2 != nil {
 				pulsarConfig.OAuth2 = &PulsarOAuth2{
@@ -722,13 +727,14 @@
 		var cloudStorageConfig *CloudStorageConfig
 		if cloned.Sink.CloudStorageConfig != nil {
 			cloudStorageConfig = &CloudStorageConfig{
-				WorkerCount:         cloned.Sink.CloudStorageConfig.WorkerCount,
-				FlushInterval:       cloned.Sink.CloudStorageConfig.FlushInterval,
-				FileSize:            cloned.Sink.CloudStorageConfig.FileSize,
-				OutputColumnID:      cloned.Sink.CloudStorageConfig.OutputColumnID,
-				FileExpirationDays:  cloned.Sink.CloudStorageConfig.FileExpirationDays,
-				FileCleanupCronSpec: cloned.Sink.CloudStorageConfig.FileCleanupCronSpec,
-				FlushConcurrency:    cloned.Sink.CloudStorageConfig.FlushConcurrency,
+				WorkerCount:          cloned.Sink.CloudStorageConfig.WorkerCount,
+				FlushInterval:        cloned.Sink.CloudStorageConfig.FlushInterval,
+				FileSize:             cloned.Sink.CloudStorageConfig.FileSize,
+				OutputColumnID:       cloned.Sink.CloudStorageConfig.OutputColumnID,
+				FileExpirationDays:   cloned.Sink.CloudStorageConfig.FileExpirationDays,
+				FileCleanupCronSpec:  cloned.Sink.CloudStorageConfig.FileCleanupCronSpec,
+				FlushConcurrency:     cloned.Sink.CloudStorageConfig.FlushConcurrency,
+				OutputRawChangeEvent: cloned.Sink.CloudStorageConfig.OutputRawChangeEvent,
 			}
 		}
 		var debeziumConfig *DebeziumConfig
@@ -1194,6 +1200,7 @@
 	AuthTLSCertificatePath  *string       `json:"auth-tls-certificate-path,omitempty"`
 	AuthTLSPrivateKeyPath   *string       `json:"auth-tls-private-key-path,omitempty"`
 	OAuth2                  *PulsarOAuth2 `json:"oauth2,omitempty"`
+	OutputRawChangeEvent    *bool         `json:"output-raw-change-event,omitempty"`
 }
 
 // PulsarOAuth2 is the configuration for OAuth2
@@ -1243,6 +1250,7 @@
 	CodecConfig                  *CodecConfig              `json:"codec_config,omitempty"`
 	LargeMessageHandle           *LargeMessageHandleConfig `json:"large_message_handle,omitempty"`
 	GlueSchemaRegistryConfig     *GlueSchemaRegistryConfig `json:"glue_schema_registry_config,omitempty"`
+	OutputRawChangeEvent         *bool                     `json:"output_raw_change_event,omitempty"`
 }
 
 // MySQLConfig represents a MySQL sink configuration
@@ -1266,13 +1274,14 @@
 
 // CloudStorageConfig represents a cloud storage sink configuration
 type CloudStorageConfig struct {
-	WorkerCount         *int    `json:"worker_count,omitempty"`
-	FlushInterval       *string `json:"flush_interval,omitempty"`
-	FileSize            *int    `json:"file_size,omitempty"`
-	OutputColumnID      *bool   `json:"output_column_id,omitempty"`
-	FileExpirationDays  *int    `json:"file_expiration_days,omitempty"`
-	FileCleanupCronSpec *string `json:"file_cleanup_cron_spec,omitempty"`
-	FlushConcurrency    *int    `json:"flush_concurrency,omitempty"`
+	WorkerCount          *int    `json:"worker_count,omitempty"`
+	FlushInterval        *string `json:"flush_interval,omitempty"`
+	FileSize             *int    `json:"file_size,omitempty"`
+	OutputColumnID       *bool   `json:"output_column_id,omitempty"`
+	FileExpirationDays   *int    `json:"file_expiration_days,omitempty"`
+	FileCleanupCronSpec  *string `json:"file_cleanup_cron_spec,omitempty"`
+	FlushConcurrency     *int    `json:"flush_concurrency,omitempty"`
+	OutputRawChangeEvent *bool   `json:"output_raw_change_event,omitempty"`
 }
 
 // ChangefeedStatus holds common information of a changefeed in cdc

cdc/model/sink.go

@@ -272,7 +272,7 @@
 }
 
 // TrySplitAndSortUpdateEvent redo log do nothing
-func (r *RedoLog) TrySplitAndSortUpdateEvent(_ string) error {
+func (r *RedoLog) TrySplitAndSortUpdateEvent(_ string, _ bool) error {
 	return nil
 }
 
@@ -444,7 +444,7 @@
 }
 
 // TrySplitAndSortUpdateEvent do nothing
-func (r *RowChangedEvent) TrySplitAndSortUpdateEvent(_ string) error {
+func (r *RowChangedEvent) TrySplitAndSortUpdateEvent(_ string, _ bool) error {
 	return nil
 }
 
@@ -1140,10 +1140,19 @@
 }
 
 // TrySplitAndSortUpdateEvent split update events if unique key is updated
-func (t *SingleTableTxn) TrySplitAndSortUpdateEvent(scheme string) error {
-	if !t.shouldSplitUpdateEvent(scheme) {
+func (t *SingleTableTxn) TrySplitAndSortUpdateEvent(scheme string, outputRawChangeEvent bool) error {
+	if sink.IsMySQLCompatibleScheme(scheme) || outputRawChangeEvent {
+		// For MySQL Sink, all update events will be split into insert and delete at the puller side
+		// according to whether the changefeed is in safemode. We don't split update event here(in sink)
+		// since there may be OOM issues. For more information, ref https://github.com/tikv/tikv/issues/17062.
+		//
+		// For the Kafka and Storage sink, the outputRawChangeEvent parameter is introduced to control
+		// split behavior. TiCDC only output original change event if outputRawChangeEvent is true.
 		return nil
 	}
+
+	// Try to split update events for the Kafka and Storage sink if outputRawChangeEvent is false.
+	// Note it is only for backward compatibility, and we should remove this logic in the future.
 	newRows, err := trySplitAndSortUpdateEvent(t.Rows)
 	if err != nil {
 		return errors.Trace(err)
@@ -1152,21 +1161,6 @@
 	return nil
 }
 
-// Whether split a single update event into delete and insert events？
-//
-// For the MySQL Sink, we don't split any update event.
-// This may cause error like "duplicate entry" when sink to the downstream.
-// This kind of error will cause the changefeed to restart,
-// and then the related update rows will be splitted to insert and delete at puller side.
-//
-// For the Kafka and Storage sink, always split a single unique key changed update event, since:
-// 1. Avro and CSV does not output the previous column values for the update event, so it would
-// cause consumer missing data if the unique key changed event is not split.
-// 2. Index-Value Dispatcher cannot work correctly if the unique key changed event isn't split.
-func (t *SingleTableTxn) shouldSplitUpdateEvent(sinkScheme string) bool {
-	return !sink.IsMySQLCompatibleScheme(sinkScheme)
-}
-
 // trySplitAndSortUpdateEvent try to split update events if unique key is updated
 // returns true if some updated events is split
 func trySplitAndSortUpdateEvent(
@@ -1176,8 +1170,7 @@
 	split := false
 	for _, e := range events {
 		if e == nil {
-			log.Warn("skip emit nil event",
-				zap.Any("event", e))
+			log.Warn("skip emit nil event", zap.Any("event", e))
 			continue
 		}
 
@@ -1187,8 +1180,7 @@
 		// begin; insert into t (id) values (1); delete from t where id=1; commit;
 		// Just ignore these row changed events.
 		if colLen == 0 && preColLen == 0 {
-			log.Warn("skip emit empty row event",
-				zap.Any("event", e))
+			log.Warn("skip emit empty row event", zap.Any("event", e))
 			continue
 		}
 
@@ -1222,7 +1214,7 @@
 
 // ShouldSplitUpdateEvent determines if the split event is needed to align the old format based on
 // whether the handle key column or unique key has been modified.
-// If  is modified, we need to use splitUpdateEvent to split the update event into a delete and an insert event.
+// If is modified, we need to use splitUpdateEvent to split the update event into a delete and an insert event.
 func ShouldSplitUpdateEvent(updateEvent *RowChangedEvent) bool {
 	// nil event will never be split.
 	if updateEvent == nil {
@@ -1265,6 +1257,13 @@
 	// NOTICE: clean up pre cols for insert event.
 	insertEvent.PreColumns = nil
 
+	log.Debug("split update event", zap.Uint64("startTs", updateEvent.StartTs),
+		zap.Uint64("commitTs", updateEvent.CommitTs),
+		zap.String("schema", updateEvent.TableInfo.TableName.Schema),
+		zap.String("table", updateEvent.TableInfo.GetTableName()),
+		zap.Any("preCols", updateEvent.PreColumns),
+		zap.Any("cols", updateEvent.Columns))
+
 	return &deleteEvent, &insertEvent, nil
 }
 

cdc/model/sink_test.go

@@ -604,21 +604,32 @@ func TestTxnTrySplitAndSortUpdateEvent(t *testing.T) {
 		Rows: []*RowChangedEvent{ukUpdatedEvent},
 	}
 
-	err := txn.TrySplitAndSortUpdateEvent(sink.KafkaScheme)
+	outputRawChangeEvent := true
+	notOutputRawChangeEvent := false
+	err := txn.TrySplitAndSortUpdateEvent(sink.KafkaScheme, outputRawChangeEvent)
+	require.NoError(t, err)
+	require.Len(t, txn.Rows, 1)
+	err = txn.TrySplitAndSortUpdateEvent(sink.KafkaScheme, notOutputRawChangeEvent)
 	require.NoError(t, err)
 	require.Len(t, txn.Rows, 2)
 
 	txn = &SingleTableTxn{
 		Rows: []*RowChangedEvent{ukUpdatedEvent},
 	}
-	err = txn.TrySplitAndSortUpdateEvent(sink.MySQLScheme)
+	err = txn.TrySplitAndSortUpdateEvent(sink.MySQLScheme, outputRawChangeEvent)
+	require.NoError(t, err)
+	require.Len(t, txn.Rows, 1)
+	err = txn.TrySplitAndSortUpdateEvent(sink.MySQLScheme, notOutputRawChangeEvent)
 	require.NoError(t, err)
 	require.Len(t, txn.Rows, 1)
 
 	txn2 := &SingleTableTxn{
 		Rows: []*RowChangedEvent{ukUpdatedEvent, ukUpdatedEvent},
 	}
-	err = txn.TrySplitAndSortUpdateEvent(sink.MySQLScheme)
+	err = txn.TrySplitAndSortUpdateEvent(sink.MySQLScheme, outputRawChangeEvent)
+	require.NoError(t, err)
+	require.Len(t, txn2.Rows, 2)
+	err = txn.TrySplitAndSortUpdateEvent(sink.MySQLScheme, notOutputRawChangeEvent)
 	require.NoError(t, err)
 	require.Len(t, txn2.Rows, 2)
 }

cdc/processor/sinkmanager/table_sink_wrapper_test.go

@@ -52,8 +52,8 @@ func (m *mockSink) WriteEvents(events ...*dmlsink.CallbackableEvent[*model.RowCh
 	return nil
 }
 
-func (m *mockSink) Scheme() string {
-	return sink.BlackHoleScheme
+func (m *mockSink) SchemeOption() (string, bool) {
+	return sink.BlackHoleScheme, false
 }
 
 func (m *mockSink) GetEvents() []*dmlsink.CallbackableEvent[*model.RowChangedEvent] {

cdc/sink/dmlsink/blackhole/black_hole_dml_sink.go

@@ -47,9 +47,9 @@ func (s *DMLSink) WriteEvents(rows ...*dmlsink.CallbackableEvent[*model.RowChang
 	return
 }
 
-// Scheme return the scheme of the sink.
-func (s *DMLSink) Scheme() string {
-	return sink.BlackHoleScheme
+// SchemeOption returns the scheme and the option.
+func (s *DMLSink) SchemeOption() (string, bool) {
+	return sink.BlackHoleScheme, true
 }
 
 // Close do nothing.

cdc/sink/dmlsink/cloudstorage/cloud_storage_dml_sink.go

@@ -72,8 +72,9 @@
 // messages to individual dmlWorkers.
 // The dmlWorkers will write the encoded messages to external storage in parallel between different tables.
 type DMLSink struct {
-	changefeedID model.ChangeFeedID
-	scheme       string
+	changefeedID         model.ChangeFeedID
+	scheme               string
+	outputRawChangeEvent bool
 	// last sequence number
 	lastSeqNum uint64
 	// encodingWorkers defines a group of workers for encoding events.
@@ -144,13 +145,14 @@
 
 	wgCtx, wgCancel := context.WithCancel(ctx)
 	s := &DMLSink{
-		changefeedID:    changefeedID,
-		scheme:          strings.ToLower(sinkURI.Scheme),
-		encodingWorkers: make([]*encodingWorker, defaultEncodingConcurrency),
-		workers:         make([]*dmlWorker, cfg.WorkerCount),
-		statistics:      metrics.NewStatistics(wgCtx, changefeedID, sink.TxnSink),
-		cancel:          wgCancel,
-		dead:            make(chan struct{}),
+		changefeedID:         changefeedID,
+		scheme:               strings.ToLower(sinkURI.Scheme),
+		outputRawChangeEvent: replicaConfig.Sink.CloudStorageConfig.GetOutputRawChangeEvent(),
+		encodingWorkers:      make([]*encodingWorker, defaultEncodingConcurrency),
+		workers:              make([]*dmlWorker, cfg.WorkerCount),
+		statistics:           metrics.NewStatistics(wgCtx, changefeedID, sink.TxnSink),
+		cancel:               wgCancel,
+		dead:                 make(chan struct{}),
 	}
 	s.alive.msgCh = chann.NewAutoDrainChann[eventFragment]()
 
@@ -295,7 +297,7 @@
 	return s.dead
 }
 
-// Scheme returns the sink scheme.
-func (s *DMLSink) Scheme() string {
-	return s.scheme
+// SchemeOption returns the scheme and the option.
+func (s *DMLSink) SchemeOption() (string, bool) {
+	return s.scheme, s.outputRawChangeEvent
 }

cdc/sink/dmlsink/event.go

@@ -23,7 +23,7 @@ type TableEvent interface {
 	// GetCommitTs returns the commit timestamp of the event.
 	GetCommitTs() uint64
 	// TrySplitAndSortUpdateEvent split the update to delete and insert if the unique key is updated
-	TrySplitAndSortUpdateEvent(scheme string) error
+	TrySplitAndSortUpdateEvent(scheme string, outputRawChangeEvent bool) error
 }
 
 // CallbackFunc is the callback function for callbackable event.

cdc/sink/dmlsink/event_sink.go

@@ -18,10 +18,8 @@ type EventSink[E TableEvent] interface {
 	// WriteEvents writes events to the sink.
 	// This is an asynchronously and thread-safe method.
 	WriteEvents(events ...*CallbackableEvent[E]) error
-
-	// Scheme returns the sink scheme.
-	Scheme() string
-
+	// SchemeOption returns the sink scheme and whether the sink should output raw change event.
+	SchemeOption() (scheme string, outputRawChangeEvent bool)
 	// Close closes the sink. Can be called with `WriteEvents` concurrently.
 	Close()
 	// The EventSink meets internal errors and has been dead already.

cdc/sink/dmlsink/mq/kafka_dml_sink.go

@@ -122,8 +122,8 @@ func NewKafkaDMLSink(
 	metricsCollector := factory.MetricsCollector(tiflowutil.RoleProcessor, adminClient)
 	dmlProducer := producerCreator(ctx, changefeedID, asyncProducer, metricsCollector, errCh, failpointCh)
 	encoderGroup := codec.NewEncoderGroup(replicaConfig.Sink, encoderBuilder, changefeedID)
-	s := newDMLSink(ctx, changefeedID, dmlProducer, adminClient, topicManager,
-		eventRouter, trans, encoderGroup, protocol, scheme, errCh)
+	s := newDMLSink(ctx, changefeedID, dmlProducer, adminClient, topicManager, eventRouter, trans, encoderGroup,
+		protocol, scheme, replicaConfig.Sink.KafkaConfig.GetOutputRawChangeEvent(), errCh)
 	log.Info("DML sink producer created",
 		zap.String("namespace", changefeedID.Namespace),
 		zap.String("changefeedID", changefeedID.ID))