Github user pwendell commented on the pull request: https://github.com/apache/spark/pull/148#issuecomment-37761875 @sryza when a user builds an application assembly jar, they are allowed to bundle their own log4j.properties file in the jar. Is this not working for you on YARN? Spark's own build intentionally ignores the Hadoop log4j.properties file so that it won't be detected: https://github.com/apache/spark/blob/master/assembly/pom.xml#L130 If a user is building their own assembly jar they would need to similarly exclude other `log4j.properties` files that might get pulled in and put their own one in `src/main/resources` so it gets bundled in the jar.
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