Luke Chen created KAFKA-15911:
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Summary: KRaft quorum leader should make sure the follower fetch
is making progress
Key: KAFKA-15911
URL: https://issues.apache.org/jira/browse/KAFKA-15911
Project: Kafka
Issue Type: Bug
Components: kraft
Reporter: Luke Chen
Just because the leader returned a successful response to FETCH and
FETCH_SNAPSHOT doesn't mean that the followers were able to handle the response
correctly.
For example, imagine the case where the log end offset (LEO) is at 1000 and all
of the followers are continuously fetching at offset 0 without ever increasing
their fetch offset. This can happen if the followers encounter an error when
processing the FETCH or FETCH_SNAPSHOT response.
In this scenario the leader will never be able to increase the HWM. I think
that this scenario is specific to KRaft and doesn't exists in Raft because
KRaft is pull vs Raft which is push.
https://github.com/apache/kafka/pull/14428#pullrequestreview-1751408695
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