Github user shivaram commented on the pull request:

    https://github.com/apache/spark/pull/27#issuecomment-36271766
  
    IMHO it would be better to try the simpler solution first and see how it 
works -- With a large enough number of executors I think the probability of 
seeing the same executors repeatedly should be pretty small 
    
    P.S: (It looks like an instance of balls-bins problem to me, so the 
imbalance should be at worst log N ?).  


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