[jira] [Created] (KAFKA-16192) Introduce usage of flexible records to coordinators

["Justine Olshan (Jira)" <ji...@apache.org>]

Justine Olshan created KAFKA-16192:
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             Summary: Introduce usage of flexible records to coordinators
                 Key: KAFKA-16192
                 URL: https://issues.apache.org/jira/browse/KAFKA-16192
             Project: Kafka
          Issue Type: Task
            Reporter: Justine Olshan
            Assignee: Justine Olshan


[KIP-915| https://cwiki.apache.org/confluence/display/KAFKA/KIP-915%3A+Txn+and+Group+Coordinator+Downgrade+Foundation] introduced flexible versions to the records used for the group and transaction coordinators.
However, the KIP did not update the record version used.

For [KIP-890|https://cwiki.apache.org/confluence/display/KAFKA/KIP-890%3A+Transactions+Server-Side+Defense] we intend to use flexible fields in the transaction state records. This requires a safe way to upgrade from non-flexible version records to flexible version records.

Typically this is done as a message format bump. There may be an option to make this change using MV since if the readers of the records are internal and not external consumers.



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