Github user andrewor14 commented on the pull request:

    https://github.com/apache/spark/pull/8668#issuecomment-139029438
  
    @KaiXinXiaoLei if you delete this then `sc.killExecutor` will no longer 
lower the target, so new executors will always replace the old ones that we 
just killed. This is not the behavior that we want.


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