Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/750#issuecomment-138569872
The `cancel` in the SourceFunction interface? As I said, I think it should
be non-blocking. The cancel only sets an internal variable. The source must
then respond by exiting from it's main loop and doing any cleanup in close or
after the main-loop in `invoke`.
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