Github user kanzhang commented on the pull request:
https://github.com/apache/spark/pull/6676#issuecomment-110500607
Since those child processes are run using the same user account, they will
be able to see each other's /proc, right? Also, /proc is more of a UNIX feature
(OS X and Windows don't have /proc?). I would think using pipe is more portable
as it is supported by Java.
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