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KAFKA-20395: Support unregistering controllers#22191

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kevin-wu24 wants to merge 6 commits intoapache:trunkfrom
kevin-wu24:KAFKA-20395
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KAFKA-20395: Support unregistering controllers#22191
kevin-wu24 wants to merge 6 commits intoapache:trunkfrom
kevin-wu24:KAFKA-20395

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@kevin-wu24 kevin-wu24 commented May 1, 2026 •
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What Changed

  • Introduce UnregisterControllerRequest and UnregisterControllerResponse RPC schemas
  • Introduce Admin#unregisterController interface, which the kafka-cluster and kafka-metadata-quorum tools call via the AdminClient to unregister a controller
  • Add controller-side handling for UnregisterControllerRequest
  • Introduce UnregisterControllerRecord metadata record schema + new MetadataVersion IBP_4_4_IV1 to support this feature
  • Add handling for replaying the UnregisterControllerRecord on the active controller and in the Cluster/MetadataDelta to remove unregistered controllers from the MetadataImage
  • Add the kafka-cluster unregister-controller CLI command
  • Add the --unregister flag to the kafka-metadata-quorum remove-controller command

@github-actions github-actions Bot added triage PRs from the community streams core Kafka Broker tools kraft clients labels May 1, 2026
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