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https://issues.apache.org/jira/browse/KAFKA-18389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18078197#comment-18078197
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Yunseop Eom commented on KAFKA-18389:
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Hi,
I opened a PR for this issue:
https://github.com/apache/kafka/pull/22203
The patch preserves the candidate `votedKey` when transitioning to
`LeaderState`. Previously, `LeaderState.election()` returned an elected-leader
state with an empty `votedKey`, so the candidate's self-vote could be dropped
when `QuorumState.transitionToLeader` wrote the leader election state.
The change also keeps the same `votedKey` across the soft `ResignedState`
representation so the election state remains consistent after a leader resigns.
Testing:
./gradlew :raft:unitTest
> Do not lose votedKey on transition to LeaderState
> -------------------------------------------------
>
> Key: KAFKA-18389
> URL: https://issues.apache.org/jira/browse/KAFKA-18389
> Project: Kafka
> Issue Type: Improvement
> Components: kraft
> Reporter: Alyssa Huang
> Priority: Minor
>
> After KAFKA-17642 is merged in, all epoch state transitions (other than the
> transition to Leader) will preserve votedKey and leaderId state. We should
> make the transition to LeaderState consistent with this.
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