Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/2725#issuecomment-59125060
Funny. Seems to be a feature of the JVM itself, but I can't find any
documentation about it.
$ _JAVA_OPTIONS=-Dfoo=bar java -version
Picked up _JAVA_OPTIONS: -Dfoo=bar
java version "1.6.0_37"
Java(TM) SE Runtime Environment (build 1.6.0_37-b06)
Java HotSpot(TM) 64-Bit Server VM (build 20.12-b01, mixed mode)
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