Skip the tiflash job. (#941)

[sre-bot]

cherry-pick #941 to release-3.1

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What problem does this PR solve?

Fix abort when there'a model.ActionUpdateTiFlashReplicaStatus job caused the job.Query is empty:

tidb-binlog/drainer/schema.go

Line 280 in cd9a4d1

return "", "", "", errors.Errorf("[ddl job sql miss]%+v", job)

[ddl job sql miss]ID:85, Type:update tiflash replica status, State:synced, SchemaState:public, SchemaID:45, TableID:62, RowCount:0, ArgLen:0, start time: 2020-04-01 10:52:07.845 +0800 CST, Err:<nil>, ErrCount:0, SnapshotVersion:0"] [errorVerbose="[ddl job sql miss]I      D:85, Type:update tiflash replica status, State:synced, SchemaState:public, SchemaID:45, TableID:62, RowCount:0, ArgLen:0, start time: 2020-04-01 10:52:07.845 +0800 CST, Err:<nil>, ErrCount:0, SnapshotVersion:0\ngithub.com/pingcap/tidb-binlog/drainer.(*Schema).handl      eDDL\n\t/home/jenkins/agent/workspace/release_tidb_4.0/go/src/github.com/pingcap/tidb-binlo

What is changed and how it works?

Skip the tiflash job.

Check List

Tests

• Manual test (add detailed scripts or steps below)
  test:

1. create table t(id int);
2. ALTER TABLE t SET TIFLASH REPLICA 3 LOCATION LABELS "rack", "host", "abc"; // model.ActionSetTiFlashReplica
3. curl -X POST -d '{"id":45,"region_count":3,"flash_region_count":3}' https://127.0.0.1:10080/tiflash/replica // model.ActionUpdateTiFlashReplicaStatus
4. performance write on table t and check can still replicate.

ref: pingcap/tidb#12453

• No code

Related changes

• Need to cherry-pick to the release branch

• Need to be included in the release note

  • Skip TiFlash relate DDL job to avoid replication abort.

[july2993]

/run-all-tests