Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/2401#issuecomment-56123690
Yes @willb I have the same concern. I think in other contexts "overhead"
refers to the additional space, not the total space, so an "overhead fraction"
of 0.15 means we use extra space that is equal to 15% of the original memory.
It will be confusing if we expose a "fraction" config that has a value of 1.15.
However, even with the latest changes this is still inconsistent with what
we do for yarn. I think there is value in having an equivalent config for Mesos
rather than one that is semantically different.
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