Github user ash211 commented on the pull request:
https://github.com/apache/spark/pull/2410#issuecomment-55862389
One note about this setting is that I'm not sure it works in all settings
-- if you pass it to a driver as a parameter then it's too late to take effect
(the JVM has already started).
```./bin/spark-shell --driver-java-options "-Dspark.driver.memory=1576m"```
doesn't actually change driver memory.
Maybe the docs should mention where it does and doesn't work?
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