Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/987#issuecomment-45292958
Ok, in cluster mode you can't use SparkConf.set(), but the other two
options work fine. You can't do System.setProperty() in cluster mode to achieve
that either, so even with your patch, you'd have to use -DSPARK_JAR=foo in the
command line for it to work in yarn-cluster mode.
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