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Status

Current state:  Under Discussion

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

Motivation

Currently AdminClient supports describeTopics(Collection<String> topicNames) method for describing topics and listTopics() for topic name listing.
To describe all topics, users currently use listTopics() to get all topic names and pass the name list to describeTopics.
Since "describe all topics" is a common operation, We propose to add describeTopics() method to get all topic descriptions in single call.
This will be simple to use and avoids additional metadata requests.

Public Interfaces

API Changes

We will introduce new API methods to AdminClient to describe all topics. 

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/**
 * The result of the {@link KafkaAdminClient#describeTopics()} call.
 */
public class DescribeAllTopicsResult {
    private final KafkaFuture<Collection<TopicDescription>> future;

    DescribeAllTopicsResult(KafkaFuture<Collection<TopicDescription>> future) {
        this.future = future;
    }

    public KafkaFuture<Collection<TopicDescription>> value() {
        return future;
    }
}

Compatibility, Deprecation, and Migration Plan

• There won’t be any compatibility issues