Jason Gustafson created KAFKA-7959:
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Summary: Clear/delete epoch cache if old message format is in use
Key: KAFKA-7959
URL: https://issues.apache.org/jira/browse/KAFKA-7959
Project: Kafka
Issue Type: Bug
Reporter: Jason Gustafson
Because of KAFKA-7897, it is possible to have a sparse epoch cache when using
the old message format. The fix for that issue addresses the problem of
improper use of that cache while the message format remains on an older
version. However, it leaves the possibility of misuse during a message format
upgrade, which can cause unexpected truncation and re-replication. To fix the
problem, we should delete or at least clear the cache whenever the old message
format is used.
Note that this problem was fixed unintentionally in 2.1 with the patch for
KAFKA-7897. This issue applies specifically to the 2.0 branch.
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