Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/2401#issuecomment-57697092
A fraction wouldn't work well for pyspark on Yarn, because the memory used
by the python processes is not a fraction of the JVM heap. I don't know about
Mesos, but Yarn will kill your containers if they go over the allocated memory,
so that's an actual issue.
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