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utils.go
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/
utils.go
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// Copyright 2020 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 cdclog
import (
"context"
"encoding/json"
"fmt"
"sync"
"time"
"github.com/pingcap/br/pkg/storage"
"github.com/pingcap/log"
"github.com/pingcap/ticdc/cdc/model"
"github.com/pingcap/ticdc/cdc/sink/codec"
"github.com/pingcap/ticdc/pkg/quotes"
"github.com/uber-go/atomic"
"go.uber.org/zap"
"golang.org/x/sync/errgroup"
)
const (
tablePrefix = "t_"
logMetaFile = "log.meta"
ddlEventsDir = "ddls"
ddlEventsPrefix = "ddl"
maxUint64 = ^uint64(0)
)
type logUnit interface {
TableID() int64
Events() *atomic.Int64
Size() *atomic.Int64
dataChan() chan *model.RowChangedEvent
isEmpty() bool
shouldFlush() bool
// flush data to storage.
flush(ctx context.Context, sink *logSink) error
}
type logSink struct {
notifyChan chan []logUnit
notifyWaitChan chan struct{}
encoder func() codec.EventBatchEncoder
units []logUnit
// file sink use
rootPath string
// s3 sink use
storagePath storage.ExternalStorage
hashMap sync.Map
}
func newLogSink(root string, storage storage.ExternalStorage) *logSink {
return &logSink{
notifyChan: make(chan []logUnit),
notifyWaitChan: make(chan struct{}),
encoder: func() codec.EventBatchEncoder {
ret := codec.NewJSONEventBatchEncoder()
ret.(*codec.JSONEventBatchEncoder).SetMixedBuildSupport(true)
return ret
},
units: make([]logUnit, 0),
rootPath: root,
storagePath: storage,
}
}
// s3Sink need this
func (l *logSink) storage() storage.ExternalStorage {
return l.storagePath
}
// fileSink need this
func (l *logSink) root() string {
return l.rootPath
}
func (l *logSink) startFlush(ctx context.Context) error {
ticker := time.NewTicker(500 * time.Millisecond)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
log.Info("[startFlush] log sink stopped")
return ctx.Err()
case needFlushedUnits := <-l.notifyChan:
// try specify buffers
eg, ectx := errgroup.WithContext(ctx)
for _, u := range needFlushedUnits {
uReplica := u
eg.Go(func() error {
log.Info("start Flush asynchronously to storage by caller",
zap.Int64("table id", u.TableID()),
zap.Int64("size", u.Size().Load()),
zap.Int64("event count", u.Events().Load()),
)
return uReplica.flush(ectx, l)
})
}
if err := eg.Wait(); err != nil {
return err
}
// tell flush goroutine this time flush finished
l.notifyWaitChan <- struct{}{}
case <-ticker.C:
// try all tableBuffers
eg, ectx := errgroup.WithContext(ctx)
for _, u := range l.units {
uReplica := u
if u.shouldFlush() {
eg.Go(func() error {
log.Info("start Flush asynchronously to storage",
zap.Int64("table id", u.TableID()),
zap.Int64("size", u.Size().Load()),
zap.Int64("event count", u.Events().Load()),
)
return uReplica.flush(ectx, l)
})
}
}
if err := eg.Wait(); err != nil {
return err
}
}
}
}
func (l *logSink) emitRowChangedEvents(ctx context.Context, newUnit func(int64) logUnit, rows ...*model.RowChangedEvent) error {
for _, row := range rows {
// dispatch row event by tableID
tableID := row.Table.GetTableID()
var (
ok bool
item interface{}
hash int
)
if item, ok = l.hashMap.Load(tableID); !ok {
// found new tableID
l.units = append(l.units, newUnit(tableID))
hash = len(l.units) - 1
l.hashMap.Store(tableID, hash)
} else {
hash = item.(int)
}
select {
case <-ctx.Done():
return ctx.Err()
case l.units[hash].dataChan() <- row:
l.units[hash].Size().Add(row.ApproximateSize)
l.units[hash].Events().Inc()
}
}
return nil
}
func (l *logSink) flushRowChangedEvents(ctx context.Context, resolvedTs uint64) (uint64, error) {
// TODO update flush policy with size
select {
case <-ctx.Done():
return 0, ctx.Err()
default:
needFlushedUnits := make([]logUnit, 0, len(l.units))
for _, u := range l.units {
if !u.isEmpty() {
needFlushedUnits = append(needFlushedUnits, u)
}
}
if len(needFlushedUnits) > 0 {
select {
case <-ctx.Done():
return 0, ctx.Err()
case <-time.After(defaultFlushRowChangedEventDuration):
// cannot accumulate enough row events in 5 second
// call flushed worker to flush
l.notifyChan <- needFlushedUnits
// wait flush worker finished
<-l.notifyWaitChan
}
}
}
return resolvedTs, nil
}
type logMeta struct {
Names map[int64]string `json:"names"`
GlobalResolvedTS uint64 `json:"global_resolved_ts"`
}
func newLogMeta() *logMeta {
return &logMeta{
Names: make(map[int64]string),
}
}
// Marshal saves logMeta
func (l *logMeta) Marshal() ([]byte, error) {
return json.Marshal(l)
}
func makeTableDirectoryName(tableID int64) string {
return fmt.Sprintf("%s%d", tablePrefix, tableID)
}
func makeTableFileObject(tableID int64, commitTS uint64) string {
return fmt.Sprintf("%s%d/%s", tablePrefix, tableID, makeTableFileName(commitTS))
}
func makeTableFileName(commitTS uint64) string {
return fmt.Sprintf("cdclog.%d", commitTS)
}
func makeLogMetaContent(tableInfos []*model.SimpleTableInfo) *logMeta {
meta := new(logMeta)
names := make(map[int64]string)
for _, table := range tableInfos {
if table != nil {
log.Info("[makeLogMetaContent]", zap.Reflect("table", table))
names[table.TableID] = quotes.QuoteSchema(table.Schema, table.Table)
}
}
meta.Names = names
return meta
}
func makeDDLFileObject(commitTS uint64) string {
return fmt.Sprintf("%s/%s", ddlEventsDir, makeDDLFileName(commitTS))
}
func makeDDLFileName(commitTS uint64) string {
return fmt.Sprintf("%s.%d", ddlEventsPrefix, maxUint64-commitTS)
}