Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/987#issuecomment-45290220
There's no need to change Client.scala with my change; all you need to do
is set "spark.yarn.jar" somewhere - JVM system property, spark-defaults.conf,
of in the app's code (modifying the SparkConf instance), and it will be picked
up by the Yarn code.
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