Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/2401#issuecomment-57697590
I guess it depends on what "--executor-memory" means on Mesos. On Yarn, it
means the "-Xmx" value for the JVM. So it doesn't include the memory used by
any python processes included in the process group. So `--executor-memory +
overheadMemory` should be able to cover the JVM heap + JVM overhead + RSS of
all the python processes. At that point, a fraction doesn't make sense,
because, as I mentioned above, the memory of the python processes is unrelated
to the JVM heap size.
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