Github user bien commented on the pull request:
https://github.com/apache/spark/pull/5351#issuecomment-112839205
Hi, I think we can close it. I took another look at my job and I found
that AWS/EMR had set up spark to use the CMS garbage collector. By simply
removing the flag and going back to the default GC I got much better throughput
improvement than I got from this proposed patch.
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