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mounter_group.go
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/
mounter_group.go
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// Copyright 2022 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 entry
import (
"context"
"time"
"github.com/pingcap/errors"
"github.com/pingcap/tiflow/cdc/model"
"github.com/pingcap/tiflow/pkg/filter"
"github.com/pingcap/tiflow/pkg/integrity"
"github.com/pingcap/tiflow/pkg/util"
"golang.org/x/sync/errgroup"
)
// MounterGroup is a group of mounter workers
type MounterGroup interface {
util.Runnable
AddEvent(ctx context.Context, event *model.PolymorphicEvent) error
TryAddEvent(ctx context.Context, event *model.PolymorphicEvent) (bool, error)
}
type mounterGroup struct {
schemaStorage SchemaStorage
inputCh chan *model.PolymorphicEvent
tz *time.Location
filter filter.Filter
integrity *integrity.Config
workerNum int
changefeedID model.ChangeFeedID
}
const (
defaultMounterWorkerNum = 16
defaultInputChanSize = 1024
defaultMetricInterval = 15 * time.Second
)
// NewMounterGroup return a group of mounters.
func NewMounterGroup(
schemaStorage SchemaStorage,
workerNum int,
filter filter.Filter,
tz *time.Location,
changefeedID model.ChangeFeedID,
integrity *integrity.Config,
) *mounterGroup {
if workerNum <= 0 {
workerNum = defaultMounterWorkerNum
}
return &mounterGroup{
schemaStorage: schemaStorage,
inputCh: make(chan *model.PolymorphicEvent, defaultInputChanSize),
filter: filter,
tz: tz,
integrity: integrity,
workerNum: workerNum,
changefeedID: changefeedID,
}
}
func (m *mounterGroup) Run(ctx context.Context, _ ...chan<- error) error {
defer func() {
mounterGroupInputChanSizeGauge.DeleteLabelValues(m.changefeedID.Namespace, m.changefeedID.ID)
}()
g, ctx := errgroup.WithContext(ctx)
for i := 0; i < m.workerNum; i++ {
g.Go(func() error {
return m.runWorker(ctx)
})
}
g.Go(func() error {
metrics := mounterGroupInputChanSizeGauge.WithLabelValues(m.changefeedID.Namespace, m.changefeedID.ID)
ticker := time.NewTicker(defaultMetricInterval)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
return errors.Trace(ctx.Err())
case <-ticker.C:
metrics.Set(float64(len(m.inputCh)))
}
}
})
return g.Wait()
}
func (m *mounterGroup) WaitForReady(_ context.Context) {}
func (m *mounterGroup) Close() {}
func (m *mounterGroup) runWorker(ctx context.Context) error {
mounter := NewMounter(m.schemaStorage, m.changefeedID, m.tz, m.filter, m.integrity)
for {
select {
case <-ctx.Done():
return errors.Trace(ctx.Err())
case pEvent := <-m.inputCh:
if pEvent.RawKV.OpType == model.OpTypeResolved {
pEvent.MarkFinished()
continue
}
err := mounter.DecodeEvent(ctx, pEvent)
if err != nil {
return errors.Trace(err)
}
pEvent.MarkFinished()
}
}
}
func (m *mounterGroup) AddEvent(ctx context.Context, event *model.PolymorphicEvent) error {
select {
case <-ctx.Done():
return ctx.Err()
case m.inputCh <- event:
return nil
}
}
func (m *mounterGroup) TryAddEvent(ctx context.Context, event *model.PolymorphicEvent) (bool, error) {
select {
case <-ctx.Done():
return false, ctx.Err()
case m.inputCh <- event:
return true, nil
default:
return false, nil
}
}
// MockMountGroup is used for tests.
type MockMountGroup struct {
IsFull bool
}
// Run implements util.Runnable.
func (m *MockMountGroup) Run(ctx context.Context, _ ...chan<- error) error {
return nil
}
// WaitForReady implements util.Runnable.
func (m *MockMountGroup) WaitForReady(_ context.Context) {}
// Close implements util.Runnable.
func (m *MockMountGroup) Close() {}
// AddEvent implements MountGroup.
func (m *MockMountGroup) AddEvent(ctx context.Context, event *model.PolymorphicEvent) error {
event.MarkFinished()
return nil
}
// TryAddEvent implements MountGroup.
func (m *MockMountGroup) TryAddEvent(ctx context.Context, event *model.PolymorphicEvent) (bool, error) {
if !m.IsFull {
event.MarkFinished()
return true, nil
}
return false, nil
}