Github user SaintBacchus commented on the pull request:

    https://github.com/apache/spark/pull/3771#issuecomment-68617680
  
    @tgravescs your comment is much more clear than what I said, I have use it 
instead of mine.Thx.
    
    when Yarn HA event happens, the previous ApplicationMaster will throw a
    ```
    java.io.IOException: Failed on local exception: java.io.EOFException
    ``` 
    So the yarn cluster the catch the exception and change the final status.
    
    But the yarn client will directly go into the ShutDownHook and cause the 
problem.
    I think it haven't go into the  `DisassociatedEvent` yet, because the 
driver is still alive.


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