Github user liorchaga commented on the pull request:
https://github.com/apache/spark/pull/4998#issuecomment-78502617
The problem is having both log4j-over-slf4j and slf4j-log4j12 in the
classpath. To get it working with log4j 1.2 we need to exclude slf4j-log4j12.
Also, having both log4j-1.2.x and log4j-core-2.x in the classpath is a
problem because both have class org.apache.log4j.Logger.
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