Github user squito commented on the issue:
https://github.com/apache/spark/pull/13677
everything proposed here makes sense to me, I think just needs the one
minor reordering I mentioned.
about creating extra stages, I looked into this some here:
https://issues.apache.org/jira/browse/SPARK-10193. Actually seems fairly
straight-forward, though I never followed up on profiling the extra memory
involved. (happy to let someone else takeover, I doubt I'll get back to it
anytime soon ...)
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