Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/710#issuecomment-42692803
Yes, for yarn-cluster, we're not replacing the `app.jar`, so there should
be no backward compatibility issues. The only question is whether adding it to
`spark.jar` additionally is redundant. From my digging through the code so far
I think it is, because `SparkContext` goes ahead and adds it to its HTTP
server, even though it's already pulled in as `app.jar` on all containers.
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