Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/1472#issuecomment-49689468
I have tested this on a standalone cluster, purposefully changing the
directory structure of the driver to be different from that of the executors. I
was able to confirm that the the workers now use their own local directory to
launch the executors. I also tested changing `spark.executor.home` to both the
valid path and a bogus path, and, as expected, an application with the former
runs successfully while the latter fails the application.
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