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On the broker, we can achieve this by providing a mechanism to to force up-convert all the record batches on disk. For example, we introduce a new config log.record.version.force.upgrade with two possible values: null (default) and 2. If the value is set to 2, the broker ensures all segments have records with format v2 after log recovery has completed during start-up. This can be extended to support newer message format versions if and when they are introduced. This config is only allowed to be non-null if the if the inter.broker.protocol.version is 3.0 or higher. In a subsequent major release, we would drop support for reading v0 and v1 records from disk.

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