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For Kafka clusters where topics were configured with message format v0 or v1 at some point, we need a mechanism to ensure records are converted to the new version before the upgrade to Apache Kafka 4.0. We propose the introduction of the log.record.version.force.upgrade config for this purpose. The conversion would happen during start-up using a similar approach as log recovery after unclean shutdown.

Apache Kafka 4.0

As described above, we We will remove all support for message formats v0 and v1 in Apache Kafka 4.0.

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