DM: TestMaster is unstable.

[asddongmen]

Which jobs are flaking?

#4301

Which test(s) are flaking?

TestMaster

Jenkins logs or GitHub Actions link

2022/01/12 16:48:53.119 +08:00] [INFO] [logger.go:61] [Success] [component=openapi] [size=-1] [host=example.com] [status=204] [method=DELETE] [protocol=HTTP/1.1] [remote_ip=192.0.2.1:1234] [user_agent=] [duration=2.146357ms] [request="DELETE /api/v1/task/templates/test"]
[2022/01/12 16:48:53.122 +08:00] [INFO] [logger.go:61] [Success] [component=openapi] [size=34] [host=example.com] [status=200] [method=GET] [protocol=HTTP/1.1] [remote_ip=192.0.2.1:1234] [user_agent=] [duration=2.063581ms] [request="GET /api/v1/task/templates"]
[2022/01/12 16:48:53.122 +08:00] [INFO] [keepalive.go:194] ["watch keepalive worker quit due to context canceled"]
[2022/01/12 16:48:53.122 +08:00] [INFO] [election.go:335] ["retire from leader"] [component=election] ["current member"="{\"id\":\"dm-master-1\",\"addr\":\"127.0.0.1:43815\"}"]
[2022/01/12 16:48:53.122 +08:00] [INFO] [scheduler.go:1898] ["observeWorkerEvent will quit now"]
[2022/01/12 16:48:53.122 +08:00] [INFO] [scheduler.go:2353] ["observeLoadTask will quit now"]
[2022/01/12 16:48:53.122 +08:00] [INFO] [pessimist.go:123] ["pessimist will quit now"]
[2022/01/12 16:48:53.123 +08:00] [INFO] [server.go:264] ["closing server"]
[2022/01/12 16:48:53.122 +08:00] [WARN] [election.go:359] ["ignore notify the leader's information because context canceled"] [component=election] ["current member"="{\"id\":\"dm-master-1\",\"addr\":\"127.0.0.1:43815\"}"] [leader=null]
[2022/01/12 16:48:53.123 +08:00] [INFO] [election.go:190] ["election is closing"] [component=election] ["current member"="{\"id\":\"dm-master-1\",\"addr\":\"127.0.0.1:43815\"}"]
[2022/01/12 16:48:53.123 +08:00] [INFO] [election.go:240] ["break campaign loop, context is done"] [component=election] ["current member"="{\"id\":\"dm-master-1\",\"addr\":\"127.0.0.1:43815\"}"] [error="context canceled"]
[2022/01/12 16:48:53.126 +08:00] [INFO] [election.go:198] ["election is closed"] [component=election] ["current member"="{\"id\":\"dm-master-1\",\"addr\":\"127.0.0.1:43815\"}"]
[2022/01/12 16:48:53.130 +08:00] [INFO] [server.go:266] ["server closed"]
OOPS: 37 passed, 3 FAILED

https://ci.pingcap.net/blue/organizations/jenkins/atom-ut/detail/atom-ut/9157/tests/

Anything else we need to know

• Does this test exist for other branches as well?

• Has there been a high frequency of failure lately?

[asddongmen]

it never orrurs