Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/2031#issuecomment-67898303
Hey @CrazyJvm I believe these options are intentionally left undocumented.
These are fairly advanced settings that are meant to provide a backdoor in case
the default value turns out to be erroneous, which doesn't seem to be the case.
There is also an equivalent `spark.storage.safetyFraction` that we do not
document for the same reason.
I would recommend that we close this issue.
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