schema, sink(ticdc): fix exchange partition (#8955)

close #8914

cdc/entry/schema/snapshot.go

@@ -55,6 +55,10 @@ func (s *Snapshot) PreTableInfo(job *timodel.Job) (*model.TableInfo, error) {
 	case timodel.ActionRenameTables:
 		// DDL on multiple tables, ignore pre table info
 		return nil, nil
+	case timodel.ActionExchangeTablePartition:
+		// get the table will be exchanged
+		table, _, err := s.inner.getSourceTable(job.BinlogInfo.TableInfo)
+		return table, err
 	default:
 		binlogInfo := job.BinlogInfo
 		if binlogInfo == nil {
@@ -885,26 +889,21 @@ func (s *snapshot) updatePartition(tbInfo *model.TableInfo, currentTs uint64) er
 	return nil
 }
 
-// exchangePartition find the partition's id in the old table info of targetTable,
-// and find the sourceTable's id in the new table info of targetTable.
-// Then set sourceTable's id to the partition's id, which make the exchange happen in snapshot.
-// Finally, update both the targetTable's info and the sourceTable's info in snapshot.
-func (s *snapshot) exchangePartition(targetTable *model.TableInfo, currentTS uint64) error {
-	var sourceTable *model.TableInfo
+func (s *snapshot) getSourceTable(targetTable *timodel.TableInfo) (*model.TableInfo, int64, error) {
 	oldTable, ok := s.physicalTableByID(targetTable.ID)
 	if !ok {
-		return cerror.ErrSnapshotTableNotFound.GenWithStackByArgs(targetTable.ID)
+		return nil, 0, cerror.ErrSnapshotTableNotFound.GenWithStackByArgs(targetTable.ID)
 	}
 
 	oldPartitions := oldTable.GetPartitionInfo()
 	if oldPartitions == nil {
-		return cerror.ErrSnapshotTableNotFound.
+		return nil, 0, cerror.ErrSnapshotTableNotFound.
 			GenWithStack("table %d is not a partitioned table", oldTable.ID)
 	}
 
 	newPartitions := targetTable.GetPartitionInfo()
 	if newPartitions == nil {
-		return cerror.ErrSnapshotTableNotFound.
+		return nil, 0, cerror.ErrSnapshotTableNotFound.
 			GenWithStack("table %d is not a partitioned table", targetTable.ID)
 	}
 
@@ -926,14 +925,13 @@ func (s *snapshot) exchangePartition(targetTable *model.TableInfo, currentTS uin
 		}
 	}
 	if len(diff) != 1 {
-		return cerror.ErrExchangePartition.
+		return nil, 0, cerror.ErrExchangePartition.
 			GenWithStackByArgs(fmt.Sprintf("The exchanged source table number must be 1, but found %v", diff))
 	}
-	sourceTable, ok = s.physicalTableByID(diff[0])
+	sourceTable, ok := s.physicalTableByID(diff[0])
 	if !ok {
-		return cerror.ErrSnapshotTableNotFound.GenWithStackByArgs(diff[0])
+		return nil, 0, cerror.ErrSnapshotTableNotFound.GenWithStackByArgs(diff[0])
 	}
-
 	// 3.find the exchanged partition info
 	diff = diff[:0]
 	for id := range oldIDs {
@@ -942,13 +940,26 @@ func (s *snapshot) exchangePartition(targetTable *model.TableInfo, currentTS uin
 		}
 	}
 	if len(diff) != 1 {
-		return cerror.ErrExchangePartition.
+		return nil, 0, cerror.ErrExchangePartition.
 			GenWithStackByArgs(fmt.Sprintf("The exchanged source table number must be 1, but found %v", diff))
 	}
 
 	exchangedPartitionID := diff[0]
+	return sourceTable, exchangedPartitionID, nil
+}
+
+// exchangePartition find the partition's id in the old table info of targetTable,
+// and find the sourceTable's id in the new table info of targetTable.
+// Then set sourceTable's id to the partition's id, which make the exchange happen in snapshot.
+// Finally, update both the targetTable's info and the sourceTable's info in snapshot.
+func (s *snapshot) exchangePartition(targetTable *model.TableInfo, currentTS uint64) error {
+	var sourceTable *model.TableInfo
+	sourceTable, exchangedPartitionID, err := s.getSourceTable(targetTable.TableInfo)
+	if err != nil {
+		return errors.Trace(err)
+	}
 	// 4.update the targetTable
-	err := s.updatePartition(targetTable, currentTS)
+	err = s.updatePartition(targetTable, currentTS)
 	if err != nil {
 		return errors.Trace(err)
 	}

cdc/sink/ddlsink/cloudstorage/cloud_storage_ddl_sink.go

@@ -21,6 +21,7 @@ import (
 	"github.com/pingcap/errors"
 	"github.com/pingcap/log"
 	"github.com/pingcap/tidb/br/pkg/storage"
+	timodel "github.com/pingcap/tidb/parser/model"
 	"github.com/pingcap/tiflow/cdc/contextutil"
 	"github.com/pingcap/tiflow/cdc/model"
 	"github.com/pingcap/tiflow/cdc/sink/ddlsink"
@@ -62,29 +63,41 @@ func NewDDLSink(ctx context.Context, sinkURI *url.URL) (*DDLSink, error) {
 
 // WriteDDLEvent writes the ddl event to the cloud storage.
 func (d *DDLSink) WriteDDLEvent(ctx context.Context, ddl *model.DDLEvent) error {
+	writeFile := func(def cloudstorage.TableDefinition) error {
+		encodedDef, err := def.MarshalWithQuery()
+		if err != nil {
+			return errors.Trace(err)
+		}
+
+		path, err := def.GenerateSchemaFilePath()
+		if err != nil {
+			return errors.Trace(err)
+		}
+		log.Debug("write ddl event to external storage",
+			zap.String("path", path), zap.Any("ddl", ddl))
+		return d.statistics.RecordDDLExecution(func() error {
+			err1 := d.storage.WriteFile(ctx, path, encodedDef)
+			if err1 != nil {
+				return err1
+			}
+
+			return nil
+		})
+	}
+
 	var def cloudstorage.TableDefinition
 	def.FromDDLEvent(ddl)
-	encodedDef, err := def.MarshalWithQuery()
-	if err != nil {
+	if err := writeFile(def); err != nil {
 		return errors.Trace(err)
 	}
 
-	path, err := def.GenerateSchemaFilePath()
-	if err != nil {
-		return errors.Trace(err)
+	if ddl.Type == timodel.ActionExchangeTablePartition {
+		// For exchange partition, we need to write the schema of the source table.
+		var sourceTableDef cloudstorage.TableDefinition
+		sourceTableDef.FromTableInfo(ddl.PreTableInfo, ddl.TableInfo.Version)
+		return writeFile(sourceTableDef)
 	}
-	log.Debug("write ddl event to external storage",
-		zap.String("path", path), zap.Any("ddl", ddl))
-	err = d.statistics.RecordDDLExecution(func() error {
-		err1 := d.storage.WriteFile(ctx, path, encodedDef)
-		if err1 != nil {
-			return err1
-		}
-
-		return nil
-	})
-
-	return errors.Trace(err)
+	return nil
 }
 
 // WriteCheckpointTs writes the checkpoint ts to the cloud storage.

tests/integration_tests/canal_json_storage_partition_table/data/prepare.sql

@@ -21,11 +21,11 @@ alter table t1 drop partition p1;
 insert into t1 values (7),(8),(9);
 update t1 set a=a+10 where a=9;
 
-/* TODO(CharlesCheung): EXCHANGE PARTITION will be supported in the future */
--- create table t2 (a int primary key);
--- ALTER TABLE t1 EXCHANGE PARTITION p3 WITH TABLE t2;
--- insert into t2 values (100),(101),(102),(103),(104),(105); /*these values will be replicated to in downstream t2*/
--- insert into t1 values (25),(29); /*these values will be replicated to in downstream t1.p3*/
+/* TODO: add more test for EXCHANGE PARTITION, ref: https://github.com/pingcap/tiflow/issues/8956 */
+create table t2 (a int primary key);
+ALTER TABLE t1 EXCHANGE PARTITION p3 WITH TABLE t2;
+insert into t2 values (100),(101),(102),(103),(104),(105); /*these values will be replicated to in downstream t2*/
+insert into t1 values (25),(29); /*these values will be replicated to in downstream t1.p3*/
 
 ALTER TABLE t1 REORGANIZE PARTITION p0,p2 INTO (PARTITION p0 VALUES LESS THAN (5), PARTITION p1 VALUES LESS THAN (10), PARTITION p2 VALUES LESS THAN (21));
 insert into t1 values (-1),(6),(13);

tests/integration_tests/csv_storage_partition_table/data/prepare.sql

@@ -21,11 +21,11 @@ alter table t1 drop partition p1;
 insert into t1 values (7),(8),(9);
 -- update t1 set a=a+10 where a=9;
 
-/* TODO(CharlesCheung): EXCHANGE PARTITION will be supported in the future */
--- create table t2 (a int primary key);
--- ALTER TABLE t1 EXCHANGE PARTITION p3 WITH TABLE t2;
--- insert into t2 values (100),(101),(102),(103),(104),(105); /*these values will be replicated to in downstream t2*/
--- insert into t1 values (25),(29); /*these values will be replicated to in downstream t1.p3*/
+/* TODO: add more test for EXCHANGE PARTITION, ref: https://github.com/pingcap/tiflow/issues/8956 */
+create table t2 (a int primary key);
+ALTER TABLE t1 EXCHANGE PARTITION p3 WITH TABLE t2;
+insert into t2 values (100),(101),(102),(103),(104),(105); /*these values will be replicated to in downstream t2*/
+insert into t1 values (25),(29); /*these values will be replicated to in downstream t1.p3*/
 
 ALTER TABLE t1 REORGANIZE PARTITION p0,p2 INTO (PARTITION p0 VALUES LESS THAN (5), PARTITION p1 VALUES LESS THAN (10), PARTITION p2 VALUES LESS THAN (21));
 insert into t1 values (-1),(6),(13);