Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/3557#issuecomment-69625652
Personally, since there have been 3 stable releases already that have the
current semantics, and we effectively treat env variables as deprecated, I'd
just not change anything, document that env variables are deprecated, and
remove them in a future release (1.4 or later).
But if you guys really think this is worth doing, the latest patch looks
ok, I guess.
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