Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/2401#issuecomment-55922361
Might want to take a look at #1391 also; that adds a similar thing for Yarn
(a multiplier for the JVM overhead), it might be worth to merge the two code
paths (or add this to some utility class) so that everybody benefits.
Another thing to maybe keep in mind is Patrick's comment in SPARK-1930
about pyspark requiring even more "overhead" to be assigned.
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