[jira] [Created] (KAFKA-6556) allow to attach callbacks in kafka streams, to be triggered when a window is expired

["igor mazor (JIRA)" <ji...@apache.org>]

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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