Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/852#issuecomment-44227353
It's likely we already have many users scripting around this default
behavior of sending spark logs to stderr. If this was something where we
clearly got it wrong, we could consider changing it, but here it seems like
more of a preference than a bug.
So I think we probably shouldn't change this at this point, even though I
see the reason why sending all logs to stdout could be preferable.
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