Github user wenlonglwl commented on the pull request:
https://github.com/apache/flink/pull/1542#issuecomment-190586930
@aljoscha @StephanEwen This would not work for finite stream, data of
in-flight window would lost, when the stream finished. Can this clear window
operator changed to be configurable. in our production environment, window is
used to do some aggregation, and no lost of data is acceptable.
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