Github user sryza commented on the pull request:
https://github.com/apache/spark/pull/3525#issuecomment-65021562
In Spark 1.2, the memory overhead defaults to 7% of the executor memory.
Have you noticed that you need larger than this fraction? In the change that
added that fraction, there was some concern about having two different params
(a constant overhead and a fraction) to control the same value.
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