Anna Povzner created KAFKA-6859:
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Summary: Follower should not send OffsetForLeaderEpoch for
undefined leader epochs
Key: KAFKA-6859
URL: https://issues.apache.org/jira/browse/KAFKA-6859
Project: Kafka
Issue Type: Bug
Affects Versions: 0.11.0.0
Reporter: Anna Povzner
This is more of an optimization, rather than correctness.
Currently, if the follower on inter broker protocol version 0.11 and higher,
but on older message format, it does not track leader epochs. However, will
still send OffsetForLeaderEpoch request to the leader with undefined epoch
which is guaranteed to return undefined offset, so that the follower truncated
to high watermark. Another example is a bootstrapping follower that does not
have any leader epochs recorded,
It is cleaner and more efficient to not send OffsetForLeaderEpoch requests to
the follower with undefined leader epochs, since we already know the answer.
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