Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/148#issuecomment-37742890
@mridulm I think in YARN environments cluster operators can set a logging
file on all of the machines to be shared across applications (e.g. Spark,
MapReduce, etc). So the idea here is to point to that file.
That said @sryza one thing here is that even if a user bundles a log4j file
it will get ignored and replaced with the cluster default. That actually seems
not ideal and I'm not sure there is a good way to detect whether the user has
included their own file.
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