TaiJuWu opened a new pull request, #21025:
URL: https://github.com/apache/kafka/pull/21025
1. Track Seen Voters (KRaftControlRecordStateMachine)
- Added seenReplicaKey: Set<ReplicaKey> to maintain a historical record
of all voters
- Populates this set when processing KRAFT_VOTERS control records
- Provides hasSeenReplicaKey() method for validation
2. Server-side Validation (AddVoterHandler)
- Check if the voter key has been seen before processing the request
- Return INVALID_VOTER_KEY error if the replica has already joined
previously
- Prevents duplicate auto-join attempts at the protocol level
3. Client-side Handling (KafkaRaftClient)
- Added hasJoined flag to track successful join state
- Set hasJoined = true when receiving INVALID_VOTER_KEY error
- Prevents further auto-join attempts after initial join or rejection
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