[jira] [Created] (FLINK-20605) DeclarativeSlotManager crashes if slot allocation notification is processed after taskexecutor shutdown

[Shang Yuanchun (Jira)]

Chesnay Schepler created FLINK-20605:
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             Summary: DeclarativeSlotManager crashes if slot allocation notification is processed after taskexecutor shutdown
                 Key: FLINK-20605
                 URL: https://issues.apache.org/jira/browse/FLINK-20605
             Project: Flink
          Issue Type: Improvement
          Components: Runtime / Coordination
    Affects Versions: 1.13.0
            Reporter: Chesnay Schepler
            Assignee: Chesnay Schepler
             Fix For: 1.13.0


It appears to be possible that a notification from a task executor about a slot being allocated can be processed after that very task executor has unregistered itself from the resource manager.
As a result we run into an exception when trying to mark this slot as allocated, because it no longer exists and a precondition catches this case.

We could solve this by checking in {{DeclarativeResourceManager#allocateSlot}} whether the task executor we received the acknowledge from is still registered.



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