Github user jerryshao commented on the pull request:

    https://github.com/apache/spark/pull/7786#issuecomment-142764190
  
    Hi @vanzin , I just updated the code and added unit test. Would you please 
help to review again? Thanks a lot.
    
    Also I discussed with Yarn guys about how to use 
`PreemptionResourceRequests` to give Spark a hint to release some idle 
executors in advance, looks like currently Yarn not well supports this feature, 
and the behavior is different between schedulers, so I think it would be better 
to remain as a open question to think about. Besides introducing this mechanism 
still requires more design and implementation, I'd like to address this in a 
separate PR if there's a good design thought.


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