gaurav-narula opened a new pull request, #15836: URL: https://github.com/apache/kafka/pull/15836
KIP-227 introduced in-memory caching of FetchSessions. Brokers with a large number of Fetch requests suffer from contention on trying to acquire a lock on FetchSessionCache. This change aims to reduce lock contention for FetchSessionCache by sharding the cache into multiple segments, each responsible for an equal range of sessionIds. Assuming Fetch requests have a uniform distribution of sessionIds, the probability of contention on a segment is reduced by a factor of the number of segments. We ensure backwards compatibility by ensuring total number of cache entries remain the same as configured and sessionIds are randomly allocated. ### 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
