dajac opened a new pull request, #12674: URL: https://github.com/apache/kafka/pull/12674
There are clients out there that have implemented KIP-392 (Fetch From Follower) and thus use FetchRequest >= 11. However, they have not implemented KIP-320 which add the leader epoch to the FetchRequest in version 9. Without KIP-320, it is not safe to fetch from the follower. If a client does it by mistake – e.g. based on stale metadata – that could lead to offset out of range. This patch proposes to disable fetching from a follower when the cluster does not have a replica selector. If it does not, consumers are not expected to fetch from followers. ### Committer Checklist (excluded from commit message) - [ ] Verify design and implementation - [ ] Verify test coverage and CI build status - [ ] Verify documentation (including upgrade notes) -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: jira-unsubscr...@kafka.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
