Hi all,

I have submitted KIP-261 to add a new API for window stores in order to
optimize our current windowed aggregation implementations inside Streams DSL


This change would require people who have customized window store
implementations to make code changes as part of their upgrade path. But I
think it is worth while given that the fraction of customized window store
should be very small.

Feedback and suggestions are welcome.

-- Guozhang

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