David Arthur created KAFKA-20117:
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Summary: Improve ClusterControlManager error message
Key: KAFKA-20117
URL: https://issues.apache.org/jira/browse/KAFKA-20117
Project: Kafka
Issue Type: Improvement
Reporter: David Arthur
Fix For: 3.9.2, 4.3.0, 4.0.2, 4.1.2
During the ZK to KRaft migration, if the broker and controller are not on the
same IBP/MetadataVersion, we will get registration errors on the controller
like:
{code:java}
[ERROR] 2025-11-24 06:20:42,779 [quorum-controller-9992-event-handler]
org.apache.kafka.controller.ClusterControlManager
throwUnsupportedVersionDueToIncompatibleFeature -
[ControllerServer id=9992] Unable to register broker 2 because it does not
support finalized version 14
of confluent.metadata.version. The broker wants a version between 11 and 11,
inclusive.
{code}
This can be a bit confusing for operators since they do not normally deal with
the feature level numbers, but rather the IBP strings (e.g., "3.6-IV2").
We should enhance this error message to include the corresponding release
string for the feature levels.
Since this impacts migration, I've marked the fix version for 3.9.x.
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