apache/spark — pull request #1844 by JoshRosen (2014-08-08 00:21:55+00:00)
Title: [SPARK-2913] Place our log4j.properties at the head of the classpath.

This addresses SPARK-2913, an issue where changes to log4j.properties didn't take effect in our default Spark EC2 configuration because Hadoop's configuration directory would end up ahead of Spark's on the computed CLASSPATH.