Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/4170#issuecomment-71770662
Right, as I said, it doesn't make sense to offer task memory twice. Each
executor is a *single* JVM, and JVMs cannot scale their memory up and down. The
executor's memory is set to the same value that we configure that JVM with,
with `-Xmx`. There's no way to make tasks use more memory than that, no matter
how many tasks are running on there.
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