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A --delete switch for the consumer group command tool (kafka-consumer-groups.sh) will by supported for Kafka stored group offsets (new consumer) too, which behaves similar to its old consumer counterpart. For example, if group has active consumers the deletion will fail. In other words, a group can be deleted only when its state is Empty.

Similar to how the consumer group command line tool supports describing a single group at a time, the deletion functionality will be implemented the same way (deleting one group at a time). The protocol, however, support deleting multiple groups in one request.

Compatibility, Deprecation, and Migration Plan

The changes proposed by this KIP apply to the new Java-based consumer only, and are backward compatible because the suggested API does not already exist. New clients that work with older brokers will not be able to make use of this new API.

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