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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