Github user willb commented on the pull request:

    https://github.com/apache/spark/pull/2401#issuecomment-55902476
  
    Here's a somewhat-related concern:  it seems like JVM overhead is unlikely 
to scale linearly with requested heap size, so maybe a straight-up 15% isn't a 
great default?  (If you have hard data on how heap requirements grow with job 
size, I'd be interested in seeing it.)  Perhaps it would make more sense to 
reserve whichever is smaller of 15% or some fixed but reasonable amount.


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