Github user pwendell commented on the pull request:
https://github.com/apache/incubator-spark/pull/615#issuecomment-35581371
It looks like there is a separate variable called `amMemory` that deals
with this in YARN. The command for launching that JVM gets set-up in:
common/src/main/scala/org/apache/spark/deploy/yarn/ClientBase.scala
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