Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/659#issuecomment-99901700
By the way, how should we deal with Sources that might not have new data at
the moment but still might emit new data in the future. The interface of
reachedEnd() next() is not sufficient for this because the calls would become
blocking. And then the Task cannot suspend execution at will anymore.
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