Github user mridulm commented on the pull request: https://github.com/apache/spark/pull/148#issuecomment-37764448 Unless you are a spark developer, including at Yahoo, the person building the assembly jar is not the same as the person using spark : so depending on assembled jar containing the logging config is not a practical solution. Which is why, atleast in yarn case, I had added the ability to specify the log4j config from cli : and I know this is working till 0.9 (I am yet to move to trunk).
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