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  • KIP-328: Ability to suppress updates for KTables

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To resolve this conflict, we're adding a new concept to the window spec: grace period. This is an amount of time that the window should accept lateout-of-arriving order events after the window ends. After the grace period passes, the window is considered "closed" and will never be updated again. The grace period places a lower-bound constraint on the retention time, but otherwise has no implication on retention.