Github user aljoscha commented on the pull request: https://github.com/apache/flink/pull/659#issuecomment-102333346 Yes, I was aware of that new test. :smile: The PollingSourceFunction I didn't implement because I think this is orthogonal to this work. For the operators, I think it's not a problem because I think they refer to different concepts. The TwoInputOperator is a physical operator that happens to have two inputs. The CoStreamMap is a higher level concept that implements a Map over two connected streams. And it just so happens that this concept can be implemented using the "physical" two input operator.
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