Status

Current state: VotingAccepted

Discussion thread: https://lists.apache.org/thread/kc87jkgyvf9x7nwmgwrhx6fs6w0tqymj

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• an UNSUPPORTED_VERSION  error if the cluster's MetadataVersion does not support UnregisterControllerRecord 
• a CONTROLLER_ID_NOT_REGISTERED  error if no registration exists for the requested controller ID. This is similar to the BROKER_ID_NOT_REGISTERED error in the case of brokers.
• a NOT_CONTROLLER  error if the request does not arrive at the active controller
• a an INVALID_REQUEST error if the request arrives at the active controller. This is known to be a "mistaken" request, as it is expected controllers are not running when they are unregistered. See the User Experience for more details.

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