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Posted to jira@kafka.apache.org by "David Arthur (Jira)" <ji...@apache.org> on 2023/01/26 15:44:00 UTC

[jira] [Created] (KAFKA-14656) Brokers rejecting LISR during ZK migration

David Arthur created KAFKA-14656:
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             Summary: Brokers rejecting LISR during ZK migration
                 Key: KAFKA-14656
                 URL: https://issues.apache.org/jira/browse/KAFKA-14656
             Project: Kafka
          Issue Type: Bug
    Affects Versions: 3.4.0
            Reporter: David Arthur
            Assignee: David Arthur
             Fix For: 3.4.0


During the ZK migration, the KRaft controller sends controller RPCs to the ZK brokers (LISR, UMR, etc). Since the migration can begin immediately after a ZK broker starts up with migration enabled, it is possible that this broker is not seen as alive by the rest of the brokers. This is due to the KRaft controller taking over before the ZK controller can send out UMR with the restarted broker.

 

The result is that the parts of the LISR sent by KRaft immediately after the metadata migration is rejected by brokers due the leader being offline. 

 

The fix for this is to send an UMR to all brokers after the migration with the set of alive brokers.



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