Github user Victsm commented on the pull request:
https://github.com/apache/spark/pull/2449#issuecomment-56105298
@vanzin The --jars will still work in YARN cluster mode through the
distributed cache. Removing the spark.jars system property only prevents the
HttpFileServer mechanism to also take effect. Having both in YARN cluster mode
will cause problems because of how YARN set the permissions of the files in
distributed cache.
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