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Please keep the discussion on the mailing list rather than commenting on the wiki (wiki discussions get unwieldy fast).

Motivation

Describe the problems you are trying to solve.

Public Interfaces

Briefly list any new interfaces that will be introduced as part of this proposal or any existing interfaces that will be removed or changed. The purpose of this section is to concisely call out the public contract that will come along with this feature.

A public interface is any change to the following:

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Binary log format

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The network protocol and api behavior

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Any class in the public packages under clientsConfiguration, especially client configuration

• org/apache/kafka/common/serialization

• org/apache/kafka/common

• org/apache/kafka/common/errors

• org/apache/kafka/clients/producer

• org/apache/kafka/clients/consumer (eventually, once stable)

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Monitoring

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Command line tools and arguments

Kafka Streams was added before the Java AdminClient was introduced (KIP-117), and hence an internal StreamsKafkaClient is added for 1) managing the internal topics and 2) check compatibility between clients and brokers.

After 1.0.0 release, there are increasing number of requests to add more functionalities to the Streams client, such as purging internal data, list consumer groups etc. In addition, we also want to consolidate such duplicated code for the same functionality. So in this KIP we are proposing to add the Java AdminClient to Kafka Streams, with the goal to eventually replace StreamsKafkaClient for administrative functionalities.

Note that the scope of this KIP is only for the user facing public APIs that are needed for adding this client. We are not going to replace the whole StreamsKafkaClient completely within this KIP.

Public Interfaces

Add a new function in the org.apache.kafka.streams.KafkaClientSupplier, as the following:

import org.apache.kafka.clients.admin.AdminClient;
 
public interface KafkaClientSupplier {
    // other existing APIs

    /**
     * Create a {@link AdminClient} which is used to read records to restore {@link StateStore}s.
     *
     * @param config {@link StreamsConfig#getRestoreConsumerConfigs(String) restore consumer config} which is supplied
     *               by the {@link StreamsConfig} given to the {@link KafkaStreams}
     * @return an instance of Kafka consumer
     */
    AdminClient getAdminCLient(final Map<String, Object> config);
}

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Proposed Changes

Describe the new thing you want to do in appropriate detail. This may be fairly extensive and have large subsections of its own. Or it may be a few sentences. Use judgement based on the scope of the change.

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