Github user mbalassi commented on the pull request:
https://github.com/apache/flink/pull/659#issuecomment-99984916
@aljoscha I think we have two options:
* Those sources with return constant false in reachedEnd() and killed
externally when the user desires to do so.
* They do data-driven close, where the next() can set reachedEnd() true
upon a trigger.
Storm has an interface similar to this and seems to work. :) Task killing
is quite graceful there however, we need to be more careful there then.
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