FrankYang0529 commented on PR #18685:
URL: https://github.com/apache/kafka/pull/18685#issuecomment-2703450996

   @jsancio @MahsaSeifikar @ijuma Thanks for review. I put this PR in WIP cause 
of two reasons:
   
   1. With this fix, I observed that feature epoch keeps increasing. In trunk 
branch, if a cluster is stable, its feature epoch doesn't increase.
   2. Dynamic voter in test framework doesn't match real case. In 
`KafkaClusterTestKit` [0], it uses `BootstrapMetadata#featureLevel` [1] to 
check `kraft.version`. It goes through all `FeatureLevelRecord` and gets a 
value. In the real cluster, the `kraft.version` is stored in 
`KRaftVersionRecord`. I already addressed this in the second commit. I think 
`ReconfigurableQuorumIntegrationTest#testCreateAndDestroyReconfigurableCluster` 
can be used as the test case.
   
   [0]
   
https://github.com/apache/kafka/blob/041d8019d6f73a31a591ffba22b0fdfc3e56a9c5/test-common/test-common-runtime/src/main/java/org/apache/kafka/common/test/KafkaClusterTestKit.java#L445-L457
   
   [1]
   
https://github.com/apache/kafka/blob/041d8019d6f73a31a591ffba22b0fdfc3e56a9c5/metadata/src/main/java/org/apache/kafka/metadata/bootstrap/BootstrapMetadata.java#L128-L138


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