Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/5432#issuecomment-91362958
Note that the YARN code is not resolving `JAVA_HOME` locally, it's adding a
reference to `$JAVA_HOME` to the command that will be executed by YARN. That
will be resolved on the node where the command is run. The NM generally sets
`JAVA_HOME` for child processes.
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