Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/3557#issuecomment-69634420
@vanzin I'm not sure if it's on our roadmap to deprecate the environment
variables altogether, since there are many others for other modes that are
being actively used. That said I would also prefer to remove them eventually,
but until then we should keep the semantics in YARN consistent with other modes
(i.e. system properties should override env variables). Unfortunately we can't
do anything about the app name but to special case it.
@sryza @tgravescs any thoughts?
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