...

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

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

kafka-features.sh

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

• If nodeId is negative, the FeatureCommand throws IllegalArgumentException.

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

Rejected Alternatives

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

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.N/A