Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/2135#issuecomment-53454566
@sarutak These configs are internal to Spark and are only relevant because
of the way we do size estimation. They aren't intended to be documented and
exposed to the public, which might be confusing to the user because of all the
different fractions we have. If the user wishes, s/he can lower the relevant
`memoryFraction` instead.
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