Github user lianhuiwang commented on the pull request:
https://github.com/apache/spark/pull/3525#issuecomment-73535044
before i think that both of two configs can be existed. from @tgravescs i
think overhead is more necessary than OverheadFraction , because at some time
it has very large memory,we just use overhead to increase executor memory. now
memoryOverheadFraction is very large and inappropriate.
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