Pyspark worker memory

[Jim Blomo]

Hello, I'm using the Github snapshot of PySpark and having trouble setting
the worker memory correctly. I've set spark.executor.memory to 5g, but
somewhere along the way Xmx is getting capped to 512M. This was not
occurring with the same setup and 0.9.0. How many places do I need to
configure the memory? Thank you!