Vivek1106-04 commented on issue #12441:
URL: https://github.com/apache/seatunnel/issues/12441#issuecomment-5982000984

   @SEZ9 sorry for the slow answer on bug 2. In #12511, when 
`cleanPendingCheckpoint` cuts a draining savepoint short, the request always 
fails with `CHECKPOINT_COORDINATOR_SHUTDOWN`, whatever the close reason:
   
   | Close reason | Caller | Savepoint request fails with |
   |---|---|---|
   | `CHECKPOINT_COORDINATOR_RESET` | `restoreCoordinator()` (master failover) 
| `CHECKPOINT_COORDINATOR_SHUTDOWN` |
   | `PIPELINE_END` | `cancelCheckpoint()` | `CHECKPOINT_COORDINATOR_SHUTDOWN` |
   | `CHECKPOINT_COORDINATOR_COMPLETED` | completion of the final checkpoint | 
`CHECKPOINT_COORDINATOR_SHUTDOWN` |
   | reason passed to `handleCoordinatorError` | coordinator error | 
`CHECKPOINT_COORDINATOR_SHUTDOWN` |
   
   None of them should surface as a real savepoint failure. A draining request 
has not created its savepoint checkpoint yet, so nothing was started, and 
`JobMaster.isSavepointStartPreconditionException` is the contract for exactly 
that case. It is also what `dev` returned when its drain loop noticed 
`shutdown`.
   
   What does still surface as a real failure is a savepoint whose checkpoint 
was created and then aborted. Its `PendingCheckpoint` fails with the abort 
reason, and that reaches the shared request unchanged.
   
   As of `a691fb195`, 
`CheckpointCoordinatorTest#testCoordinatorResetDuringSavepointDrainFailsTheRequestAndResumesTriggering`
 is parameterized over all four reasons (with `CHECKPOINT_INSIDE_ERROR` 
standing in for the error case) and asserts `CHECKPOINT_COORDINATOR_SHUTDOWN` 
for each.
   
   The branch is rebased onto current `dev`, and both red-to-green regressions 
are still on it. The round answering DanielLeens's review is pushed, and CI is 
running on the new head.
   


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