tidb advancer_daemon 源码
tidb advancer_daemon 代码
文件路径：/br/pkg/streamhelper/advancer_daemon.go
// Copyright 2022 PingCAP, Inc. Licensed under Apache-2.0.
package streamhelper
import (
"context"
"time"
"github.com/google/uuid"
"github.com/pingcap/log"
"github.com/pingcap/tidb/br/pkg/logutil"
"github.com/pingcap/tidb/metrics"
"github.com/pingcap/tidb/owner"
clientv3 "go.etcd.io/etcd/client/v3"
"go.uber.org/zap"
)
const (
ownerPrompt = "log-backup"
ownerPath = "/tidb/br-stream/owner"
)
// AdvancerDaemon is a "high-availability" version of advancer.
// It involved the manager for electing a owner and doing things.
// You can embed it into your code by simply call:
//
// ad := NewAdvancerDaemon(adv, mgr)
// loop, err := ad.Begin(ctx)
//
// if err != nil {
// return err
// }
//
// loop()
type AdvancerDaemon struct {
adv *CheckpointAdvancer
manager owner.Manager
}
func NewAdvancerDaemon(adv *CheckpointAdvancer, manager owner.Manager) *AdvancerDaemon {
return &AdvancerDaemon{
adv: adv,
manager: manager,
}
}
func OwnerManagerForLogBackup(ctx context.Context, etcdCli *clientv3.Client) owner.Manager {
id := uuid.New()
return owner.NewOwnerManager(ctx, etcdCli, ownerPrompt, id.String(), ownerPath)
}
// Begin starts the daemon.
// It would do some bootstrap task, and return a closure that would begin the main loop.
func (ad *AdvancerDaemon) Begin(ctx context.Context) (func(), error) {
log.Info("begin advancer daemon", zap.String("id", ad.manager.ID()))
if err := ad.manager.CampaignOwner(); err != nil {
return nil, err
}
ad.adv.StartTaskListener(ctx)
tick := time.NewTicker(ad.adv.cfg.TickDuration)
loop := func() {
log.Info("begin advancer daemon loop", zap.String("id", ad.manager.ID()))
for {
select {
case <-ctx.Done():
log.Info("advancer loop exits", zap.String("id", ad.manager.ID()))
return
case <-tick.C:
log.Debug("deamon tick start", zap.Bool("is-owner", ad.manager.IsOwner()))
if ad.manager.IsOwner() {
metrics.AdvancerOwner.Set(1.0)
if err := ad.adv.OnTick(ctx); err != nil {
log.Warn("failed on tick", logutil.ShortError(err))
}
} else {
metrics.AdvancerOwner.Set(0.0)
}
}
}
}
return loop, nil
}
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