mmatloka opened a new pull request, #21134: URL: https://github.com/apache/kafka/pull/21134
This is attempt of backport https://github.com/apache/kafka/pull/19590 specific for Kafka 3.9. Copying description from that PR: """ The current ElectionWasClean checks if the new leader is in the previous ISR. However, there is a corner case in the partition reassignment. The partition reassignment can change the partition replicas. If the new preferred leader (the first one in the new replicas) is the last one to join ISR, this preferred leader will be elected in the same partition change. For example: In the previous state, the partition is Leader: 0, Replicas (2,1,0), ISR (1,0), Adding(2), removing(0). Then replica 2 joins the ISR. The new partition would be like: Leader: 2, Replicas (2,1), ISR(1,2). The new leader 2 is not in the previous ISR (1,0) but it is still a clean election. """ The original fix depends on ELR, however, AFAIK ELR's are valid for Kafka 4.0 and 4.1, not for 3.9. I prepared a simpler fix for 3.9 (we have encountered such problem under 3.9, and Confluent confirmed it is an issue). Note: this is my first Apache contribution, I signed the ICLA, I read the contributing guidelines, sorry if I did something incorrectly :) Let me also mention author of the original fix for 4.x - @CalvinConfluent Thank you! -- 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: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
