David Arthur created KAFKA-15799:
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             Summary: ZK brokers incorrectly handle KRaft metadata snapshots
                 Key: KAFKA-15799
                 URL: https://issues.apache.org/jira/browse/KAFKA-15799
             Project: Kafka
          Issue Type: Bug
            Reporter: David Arthur
            Assignee: David Arthur
             Fix For: 3.6.1


While working on the fix for KAFKA-15605, I noticed that ZK brokers are 
unconditionally merging data from UpdateMetadataRequest with their existing 
MetadataCache. This is not the correct behavior when handling a metadata 
snapshot from the KRaft controller. 

For example, if a topic was deleted in KRaft and not transmitted as part of a 
delta update (e.g., during a failover) then the ZK brokers will never remove 
the topic from their cache (until they restart and rebuild their cache).



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