Github user StephanEwen commented on the pull request: https://github.com/apache/flink/pull/1527#issuecomment-177599020 Concerning the data management: @aljoscha and me are currently heavily reworking that. All window operations need to go onto the "state" interfaces. Before we merge this one, we should also do that, so please do not spend much time on optimizing how the buffers for the two inputs are implemented. The interfaces for that will go into the code in a few days (they are in this pull request: https://github.com/apache/flink/pull/1562) For now, I would focus on the API and we look into the buffers in a few days. BTW: how exactly the buffered data is held (managed memory, external databases, etc) depends on the "state backend" of the job. Memory behavior can be changed that way and the operators need not worry about that.
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