Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/2401#issuecomment-56122505
@willb in the case of Yarn, the parameter is called "overhead" because it
actually sets the amount of overhead you want to add to the requested heap
memory. The PR being referenced just uses a multiplier to set the default
overhead value; the user-visible parameter doesn't set the multiplier.
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