ddl: reduce the interval for checking "create table/schema" (#7608)

ddl/ddl.go

@@ -447,6 +447,9 @@ func checkJobMaxInterval(job *model.Job) time.Duration {
 	if job.Type == model.ActionAddIndex {
 		return 3 * time.Second
 	}
+	if job.Type == model.ActionCreateTable || job.Type == model.ActionCreateSchema {
+		return 500 * time.Millisecond
+	}
 	return 1 * time.Second
 }
 
@@ -484,7 +487,7 @@ func (d *ddl) doDDLJob(ctx sessionctx.Context, job *model.Job) error {
 	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.
-	// But we use etcd to speed up, normally it takes less than 1s now, so we use 1s or 3s as the max value.
+	// But we use etcd to speed up, normally it takes less than 0.5s now, so we use 0.5s or 1s or 3s as the max value.
 	ticker := time.NewTicker(chooseLeaseTime(10*d.lease, checkJobMaxInterval(job)))
 	startTime := time.Now()
 	metrics.JobsGauge.WithLabelValues(job.Type.String()).Inc()