igor mazor created KAFKA-6556:
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Summary: allow to attach callbacks in kafka streams, to be
triggered when a window is expired
Key: KAFKA-6556
URL: https://issues.apache.org/jira/browse/KAFKA-6556
Project: Kafka
Issue Type: New Feature
Components: streams
Reporter: igor mazor
Allowing to attach callbacks in kafka streams, to be triggered when a window is
expired,
would help in use cases when the final state of the window is required.
It would be also useful if together with that functionally the user would be
able to control whether the callback would be triggered in addition to emitting
the normal change log down the stream, or only triggering the callback when the
window is expired. (for example in cases when only the final window state is
required, and any updates to the window state during the window time interval
are not important)
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