Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/12571#issuecomment-215150523
re: perm gen, what Sean said. Spark just fails with the default value.
I don't feel strongly about adding this option or not. I have never seen
anyone explicitly set it, so if it helps get stuck jobs move faster (or fail
faster) I think it's a win.
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