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This is an automated cherry-pick of pingcap#3682
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| // Copyright 2021 PingCAP, Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package sink | ||
|
|
||
| import ( | ||
| "context" | ||
| "sort" | ||
| "sync/atomic" | ||
|
|
||
| "github.com/pingcap/errors" | ||
| "github.com/pingcap/ticdc/cdc/model" | ||
| "github.com/pingcap/ticdc/cdc/redo" | ||
| ) | ||
|
|
||
| type tableSink struct { | ||
| tableID model.TableID | ||
| manager *Manager | ||
| buffer []*model.RowChangedEvent | ||
| // emittedTs means all of events which of commitTs less than or equal to emittedTs is sent to backendSink | ||
| emittedTs model.Ts | ||
| redoManager redo.LogManager | ||
| } | ||
|
|
||
| func (t *tableSink) EmitRowChangedEvents(ctx context.Context, rows ...*model.RowChangedEvent) error { | ||
| t.buffer = append(t.buffer, rows...) | ||
| t.manager.metricsTableSinkTotalRows.Add(float64(len(rows))) | ||
| if t.redoManager.Enabled() { | ||
| return t.redoManager.EmitRowChangedEvents(ctx, t.tableID, rows...) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (t *tableSink) EmitDDLEvent(ctx context.Context, ddl *model.DDLEvent) error { | ||
| // the table sink doesn't receive the DDL event | ||
| return nil | ||
| } | ||
|
|
||
| // FlushRowChangedEvents flushes sorted rows to sink manager, note the resolvedTs | ||
| // is required to be no more than global resolvedTs, table barrierTs and table | ||
| // redo log watermarkTs. | ||
| func (t *tableSink) FlushRowChangedEvents(ctx context.Context, tableID model.TableID, resolvedTs uint64) (uint64, error) { | ||
| i := sort.Search(len(t.buffer), func(i int) bool { | ||
| return t.buffer[i].CommitTs > resolvedTs | ||
| }) | ||
| if i == 0 { | ||
| atomic.StoreUint64(&t.emittedTs, resolvedTs) | ||
| ckpt, err := t.flushRedoLogs(ctx, resolvedTs) | ||
| if err != nil { | ||
| return ckpt, err | ||
| } | ||
| return t.manager.flushBackendSink(ctx, tableID) | ||
| } | ||
| resolvedRows := t.buffer[:i] | ||
| t.buffer = append(make([]*model.RowChangedEvent, 0, len(t.buffer[i:])), t.buffer[i:]...) | ||
|
|
||
| err := t.manager.backendSink.EmitRowChangedEvents(ctx, resolvedRows...) | ||
| if err != nil { | ||
| return t.manager.getCheckpointTs(tableID), errors.Trace(err) | ||
| } | ||
| atomic.StoreUint64(&t.emittedTs, resolvedTs) | ||
| ckpt, err := t.flushRedoLogs(ctx, resolvedTs) | ||
| if err != nil { | ||
| return ckpt, err | ||
| } | ||
| return t.manager.flushBackendSink(ctx, tableID) | ||
| } | ||
|
|
||
| func (t *tableSink) flushRedoLogs(ctx context.Context, resolvedTs uint64) (uint64, error) { | ||
| if t.redoManager.Enabled() { | ||
| err := t.redoManager.FlushLog(ctx, t.tableID, resolvedTs) | ||
| if err != nil { | ||
| return t.manager.getCheckpointTs(t.tableID), err | ||
| } | ||
| } | ||
| return 0, nil | ||
| } | ||
|
|
||
| // getResolvedTs returns resolved ts, which means all events before resolved ts | ||
| // have been sent to sink manager, if redo log is enabled, it also means all events | ||
| // before resolved ts have been persisted to redo log storage. | ||
| func (t *tableSink) getResolvedTs() uint64 { | ||
| ts := atomic.LoadUint64(&t.emittedTs) | ||
| if t.redoManager.Enabled() { | ||
| redoResolvedTs := t.redoManager.GetMinResolvedTs() | ||
| if redoResolvedTs < ts { | ||
| ts = redoResolvedTs | ||
| } | ||
| } | ||
| return ts | ||
| } | ||
|
|
||
| func (t *tableSink) EmitCheckpointTs(ctx context.Context, ts uint64) error { | ||
| // the table sink doesn't receive the checkpoint event | ||
| return nil | ||
| } | ||
|
|
||
| // Note once the Close is called, no more events can be written to this table sink | ||
| func (t *tableSink) Close(ctx context.Context) error { | ||
| return t.manager.destroyTableSink(ctx, t.tableID) | ||
| } | ||
|
|
||
| // Barrier is not used in table sink | ||
| func (t *tableSink) Barrier(ctx context.Context, tableID model.TableID) error { | ||
| return nil | ||
| } |