Github user andrewor14 commented on the pull request:

    https://github.com/apache/spark/pull/7716#issuecomment-129544962
  
    @KaiXinXiaoLei I think this patch is good to have, however. It does guard 
against the scenario I discussed earlier, where the user calls 
`sc.killExecutor` twice on the same executor. There are many places where we do 
this and currently we do double count. I even suspect this may be the cause of 
[SPARK-9745](https://issues.apache.org/jira/browse/SPARK-9745).
    
    I would like to merge a patch with this change + a regression test. Would 
you mind re-opening this? If not I can also do it myself.


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