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Posted to jira@kafka.apache.org by "David Arthur (Jira)" <ji...@apache.org> on 2023/06/20 16:01:00 UTC

[jira] [Created] (KAFKA-15109) ISR not expanding on ZK brokers during migration

David Arthur created KAFKA-15109:
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             Summary: ISR not expanding on ZK brokers during migration
                 Key: KAFKA-15109
                 URL: https://issues.apache.org/jira/browse/KAFKA-15109
             Project: Kafka
          Issue Type: Bug
          Components: kraft, replication
    Affects Versions: 3.5.0
            Reporter: David Arthur


KAFKA-15021 introduced a new controller behavior that avoids increasing the leader epoch during the controlled shutdown scenario. This prevents some unnecessary thrashing of metadata and threads on the brokers and clients. 

While a cluster is in a KIP-866 migration and has a KRaft controller with ZK brokers, we cannot employ this leader epoch bump avoidance. The ZK brokers must have the leader epoch bump in order for the ISR expansion to complete.



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