Github user markhamstra commented on the pull request:
https://github.com/apache/spark/pull/8427#issuecomment-134721686
This is going to increase memory pressure. The very early code never
cleaned up the Stage-tracking data structures at all, which was clearly
unacceptable for long-running Applications. What we have now cleans up as soon
as possible, and thus has minimal memory pressure. What you have in this PR
lands somewhere in between, and could cause problems if a lot of Stages stick
around for a long time.
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