[KAFKA-13193] Replica manager doesn't update partition state when transitioning from leader to follower with unknown leader

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Component/s: kraft, replication
• Labels: kip-500
• Assignee: Jose Armando Garcia Sancio
• Reporter: Jose Armando Garcia Sancio
• Created: 11/Aug/21 18:37
• Updated: 04/Feb/22 19:13
• Resolved: 04/Feb/22 19:13

Description

This issue applies to both the ZK and KRaft implementation of the replica manager. In the rare case when a replica transition from leader to follower with no leader the partition state is not updated.

This is because when handling makeFollowers the ReplicaManager only updates the partition state if the leader is alive. The solution is to always transition to follower but not start the fetcher thread if the leader is unknown or not alive.