Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/3029#issuecomment-62454596
This is a very nifty feature. However, it's not great to have modifications
to the TaskSetManager and other scheduler internals for this
presentation-related logic. It would be good if this could instead use our new
progress reporting api (/cc @JoshRosen) and if we need to modify one or two
things about that API we can do it. /cc @kayousterhout who maintains the
scheduler code. My suggestion was to move a lot of this logic outside of the
scheduler.
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