Jason Gustafson created KAFKA-7897:
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Summary: Invalid use of epoch cache following message format
downgrade
Key: KAFKA-7897
URL: https://issues.apache.org/jira/browse/KAFKA-7897
Project: Kafka
Issue Type: Bug
Reporter: Jason Gustafson
Assignee: Jason Gustafson
Message format downgrades are not supported, but they generally work as long as
broker/clients at least can continue to parse both message formats. After a
downgrade, the truncation logic should revert to using the high watermark, but
currently we use the existence of any cached epoch as the requirement in order
to leverage OffsetsForLeaderEpoch. This has the effect of causing a massive
truncation after startup which causes re-replication.
I think our options to fix this are to either 1) clear the cache when we notice
a downgrade, or 2) forbid downgrades and raise an error.
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