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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