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  • Upgrade case: Y > X and Y falls in the  [min_version, max_version] range advertised by each live broker in the cluster.

             [OR]

  • Downgrade case: Y < X, and Y falls in the  [min_version, max_version] range advertised by each live broker, and allowDowngrade flag is set in the request.

             [OR]

  • Deletion case: Y < 1 is special and indicates feature deletion, deletion of a finalized feature from the '/features' ZK node. It is allowed only if allowDowngrade flag is also set in the request.

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