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• If nodeId is valid, the Admin client sends ApiVersionRequest to a node with nodeId.

• If nodeId is not registered, the Admin client throws BrokerIdNotRegisteredExceptionTimeoutException.

kafka-features.sh

• The empty —-node-id can work as usual.

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• If nodeId is valid, the FeatureCommand gets ApiVersionResponse from a node with nodeId.

• If nodeId is not registered, the FeatureCommand throws BrokerIdNotRegisteredExceptionAdminCommandFailedException.

Alternatives

Use metrics to track finalized level and minimum / maximum supported level. The approach has been accepted in KIP-1180: Add generic feature level metrics.

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