Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/5202#issuecomment-86495944
`stderr` is just a name; I read it as a side-channel for output that is
different from program output. It can be for error messages, but is not
inherently only for error messages. I don't think it's unusual to log to stderr
but it's not universal. You can always change it though, so, I don't know that
it's worth modifying the default in Spark. This may be behavior people are
expecting at this point.
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