Github user sryza commented on the pull request:
https://github.com/apache/spark/pull/86#issuecomment-36828689
Thanks for taking a look, Matei. If we use system properties instead of
env variables, the remaining reason we'd want to start a second JVM is to be
able to have a --driver-memory property. The only way around this I can think
of would be to require users to set this with an environment variable instead
of a command line option. One small weird thing about this is that the client
would still be given the max heap specified in driver SPARK_DRIVER_MEMORY even
when the driver is being run on the cluster.
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