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Current state: "Under Discussion"

Discussion thread: here-tbd2 and here-1 

JIRA: KAFKA-19026 

Please keep the discussion on the mailing list rather than commenting on the wiki (wiki discussions get unwieldy fast).

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Also OpType.APPEND behaves inconsistently in this regard.

The behaviour shown in the ZK case makes it impossible to write a policy that fully protects topics from being left with an empty cleanup policy
(when that happens, no retention is applied and partitions can grow indefinitely).

As discussed on the dev mailing list, to avoid introducing a potentially breaking change in 3.9.2, this KIP proposes to fix the the adoption of a flag to control the policy behavior.

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