Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/8269#issuecomment-137806304
On second thought I don't think the optimization here is worth the extra
complexity. How much time do you actually save? Even in something like ALS you
only have say 20 stages or something. The new signature is actually somewhat
confusing: what does it mean to pass in both a stage and its missing stages?
What if we accidentally pass in the wrong missing stages?
I would recommend we close this PR since the scheduling delay it saves is
negligible.
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