José Armando García Sancio created KAFKA-18751:
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Summary: Complete delayed FETCH request when HWM is increased.
Key: KAFKA-18751
URL: https://issues.apache.org/jira/browse/KAFKA-18751
Project: Kafka
Issue Type: Improvement
Components: kraft
Reporter: José Armando García Sancio
Assignee: José Armando García Sancio
It is possible for HWM propagation to get delayed if the the HWM is increased
and there are no new data in the log.
One solution to this problem is for the leader to track the last HWM sent to
the replicas and immediately reply to FETCH request if the HWM is greater than
the previously sent HWM.
One issue with this solution is that the leader doesn't have a reliable way of
determining that an empty FETCH response made it to the remote replica. This
can be address if the FETCH request also include the remotes replica HWM.
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