Github user sryza commented on the pull request:
https://github.com/apache/spark/pull/710#issuecomment-42690143
Maybe you're already aware of this - in YARN cluster mode, the app jar is
renamed to "app.jar" on the cluster machine and addJar'd . So adding it to
spark.jars with its original name wouldn't work. It could make sense to not
rename it on the cluster machine, but there might be backwards compatibility
issues there with supporting YARN jobs outside spark-submit.
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