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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