Пример #1
0
func (d *ddl) doDDLJob(ctx context.Context, job *model.Job) error {
	// for every DDL, we must commit current transaction.
	if err := ctx.CommitTxn(); err != nil {
		return errors.Trace(err)
	}
	var startTS uint64
	err := kv.RunInNewTxn(d.store, true, func(txn kv.Transaction) error {
		t := meta.NewMeta(txn)
		var err error
		job.ID, err = t.GenGlobalID()
		startTS = txn.StartTS()
		return errors.Trace(err)
	})
	if err != nil {
		return errors.Trace(err)
	}
	ddlQuery, _ := ctx.Value(context.QueryString).(string)
	job.Query = ddlQuery

	// Create a new job and queue it.
	err = kv.RunInNewTxn(d.store, true, func(txn kv.Transaction) error {
		t := meta.NewMeta(txn)
		err1 := t.EnQueueDDLJob(job)
		return errors.Trace(err1)
	})
	if err != nil {
		return errors.Trace(err)
	}

	// notice worker that we push a new job and wait the job done.
	asyncNotify(d.ddlJobCh)

	log.Warnf("[ddl] start DDL job %v", job)

	var historyJob *model.Job
	jobID := job.ID
	// for a job from start to end, the state of it will be none -> delete only -> write only -> reorganization -> public
	// for every state changes, we will wait as lease 2 * lease time, so here the ticker check is 10 * lease.
	ticker := time.NewTicker(chooseLeaseTime(10*d.lease, 10*time.Second))
	startTime := time.Now()
	jobsGauge.WithLabelValues(JobType(ddlJobFlag).String(), job.Type.String()).Inc()
	defer func() {
		ticker.Stop()
		jobsGauge.WithLabelValues(JobType(ddlJobFlag).String(), job.Type.String()).Dec()
		retLabel := handleJobSucc
		if err != nil {
			retLabel = handleJobFailed
		}
		handleJobHistogram.WithLabelValues(JobType(ddlJobFlag).String(), job.Type.String(),
			retLabel).Observe(time.Since(startTime).Seconds())
	}()
	for {
		select {
		case <-d.ddlJobDoneCh:
		case <-ticker.C:
		}

		historyJob, err = d.getHistoryDDLJob(jobID)
		if err != nil {
			log.Errorf("[ddl] get history DDL job err %v, check again", err)
			continue
		} else if historyJob == nil {
			log.Warnf("[ddl] DDL job %d is not in history, maybe not run", jobID)
			continue
		}

		// if a job is a history table, the state must be JobDone or JobCancel.
		if historyJob.State == model.JobDone {
			return nil
		}

		return errors.Trace(historyJob.Error)
	}
}