m1a2st opened a new pull request, #16855:
URL: https://github.com/apache/kafka/pull/16855

   Jira: https://issues.apache.org/jira/browse/KAFKA-17297
   In old code `leaderId` and `oldLeaderId` all use `randomReplicaId()`, thus 
it will be flaky when `leaderId` is equals `oldLeaderId`. When 
`KafkaRaftClient` initialize it will find `leaderId` and `oldLeaderId`, so the 
leaderEpoch will become to three
   
   ### Committer Checklist (excluded from commit message)
   - [ ] Verify design and implementation 
   - [ ] Verify test coverage and CI build status
   - [ ] Verify documentation (including upgrade notes)
   


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