Github user markhamstra commented on the pull request:
https://github.com/apache/spark/pull/156#issuecomment-38339261
Sure, these locally iterable results are useful even without async and the
ability to cancel part way through the iteration; but that functionality is
also very useful, so we shouldn't lose track of adding it to 1.1 or later.
The ability of https://github.com/apache/incubator-spark/pull/421 to batch
the iteration up into more than just one partition per run job is also very
useful and can provide significant performance benefits -- and that's not just
speculation....
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