Github user jinxing64 commented on the issue:

    https://github.com/apache/spark/pull/20781
  
    @vanzin
    Thanks for review~ 
    1. I spent some time but didn't  find the reason why same executor is 
killed multiple times and I cannot reproduce either.
    2. I found that same completed container can be processed multiple times. 
It happens now and then. Seems yarn doesn't promise that same completed 
container only returned in one response 
(https://github.com/apache/spark/blob/master/resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnAllocator.scala#L268)


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