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Posted to dev@kafka.apache.org by "Jason Gustafson (JIRA)" <ji...@apache.org> on 2018/10/30 17:27:00 UTC

[jira] [Created] (KAFKA-7570) Make internal offsets/transaction schemas forward compatible

Jason Gustafson created KAFKA-7570:
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             Summary: Make internal offsets/transaction schemas forward compatible
                 Key: KAFKA-7570
                 URL: https://issues.apache.org/jira/browse/KAFKA-7570
             Project: Kafka
          Issue Type: Improvement
            Reporter: Jason Gustafson


Currently changes to the data stored in the internal topics (__consumer_offsets and __transaction_state) are not forward compatible. This means that once users have upgraded to a Kafka version which includes a bumped schema, then it is no longer possible to downgrade. The changes to these schemas tend to be incremental, so we should consider options that at least allow new fields to be added without breaking downgrades.



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