Github user aarondav commented on the pull request:
https://github.com/apache/spark/pull/640#issuecomment-42161131
Oops, this is actually due to a bug in my reimplementation of Python
cancellation. onCompleteCallback doesn't get called if the iterator is stuck
reading from Python. I can just revert that part of the patch to continue to
use a separate thread, or I can add an "onInterruptCallback" to TaskContext. I
will look more into it tomorrow morning.
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