[FLINK-9389] Improve error message when cancelling job in state canceled via REST API

• Type: Improvement
• Status: Closed
• Priority: Not a Priority
• Resolution: Duplicate
• Affects Version/s: 1.5.0
• Component/s: Runtime / REST
• Labels: auto-deprioritized-minor starter
• Assignee: Unassigned
• Reporter: Ufuk Celebi
• Created: 17/May/18 08:43
• Updated: 07/Apr/22 13:05
• Resolved: 07/Apr/22 13:05

Description

• Request job that has been already cancelled

  $ curl http://localhost:8081/jobs/b577a914ecdf710d4b93a84105dea0c9
  {"jid":"b577a914ecdf710d4b93a84105dea0c9","name":"CarTopSpeedWindowingExample","isStoppable":false,"state":"CANCELED", ...omitted...}
  

• Cancel job again

  $ curl -XPATCH http://localhost:8081/jobs/b577a914ecdf710d4b93a84105dea0c9\?mode\=cancel
  {"errors":["Job could not be found."]} (HTTP 404)
  

Since the actual job resource still exists, I think status code 404 is confusing. I think a better message should indicate that the job is already in state CANCELED.

Issue Links

• duplicates: FLINK-24275 Allow idempotent job cancellation