Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/2337#issuecomment-57572402
I've given it some thought and I don't think that we should merge the more
general async. mechanism that I described in #2482. It had some confusing
semantics surrounding cancellation (see the discussion of Thread.interrupt) and
was probably more general than what most users need.
Given that we should probably keep the current async APIs, this PR's change
looks good. I'm going to merge this into `master`. Thanks for this commit and
sorry for the long review delay!
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