Han Yin created FLINK-23563:
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             Summary: Sometimes ‘Stop’ cannot stop the job
                 Key: FLINK-23563
                 URL: https://issues.apache.org/jira/browse/FLINK-23563
             Project: Flink
          Issue Type: Bug
          Components: Runtime / Checkpointing
            Reporter: Han Yin


Sometimes the 'Stop' command do not stop the job after the savepoint is 
finished.

This is because currently we set _syncSavepointId_ to null whenever we 
abort/complete a checkpoint, even if the aborted/completed checkpoint is not 
the latest one.

In some rare cases, it is possible that during a 'Stop' process, we trigger a 
savepoint, and then the _syncSavepointId_ is set to null due to the abortion of 
a previous checkpoint. As a result,  the subtasks are not stopped after 
completing the savepoint.



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