Github user andrewor14 commented on the pull request:

    https://github.com/apache/spark/pull/6817#issuecomment-128922519
  
    @XuTingjun The fix here is not correct because after all tasks have been 
scheduled we keep asking for executors even though we don't need them. I would 
just add back the entire code block you deleted in L602-610 and call 
`onSchedulerBacklogged` on task end if the task is not successful.
    
    Does that make sense?


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