Github user aarondav commented on the pull request:
https://github.com/apache/incubator-spark/pull/599#discussion_r9780175
It is perhaps unfortunate that SPARK_WORKER_MEMORY actually does exist, and
controls the total amount of memory that a worker can lease across all
executors on a machine. Since this is not the property we want, perhaps we'll
be relegated to "-em --executormem" (kinda ugly, maybe there's something
nicer-looking).
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