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https://issues.apache.org/jira/browse/KAFKA-14509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17748614#comment-17748614
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David Jacot commented on KAFKA-14509:
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[~riedelmax] I left a few comments in your comment.
> Add ConsumerGroupDescribe API
> -----------------------------
>
> Key: KAFKA-14509
> URL: https://issues.apache.org/jira/browse/KAFKA-14509
> Project: Kafka
> Issue Type: Sub-task
> Reporter: David Jacot
> Assignee: Max Riedel
> Priority: Major
>
> The goal of this task is to implement the ConsumerGroupDescribe API as
> described
> [here|https://cwiki.apache.org/confluence/display/KAFKA/KIP-848%3A+The+Next+Generation+of+the+Consumer+Rebalance+Protocol#KIP848:TheNextGenerationoftheConsumerRebalanceProtocol-ConsumerGroupDescribeAPI];
> and to implement the related changes in the admin client as described
> [here|https://cwiki.apache.org/confluence/display/KAFKA/KIP-848%3A+The+Next+Generation+of+the+Consumer+Rebalance+Protocol#KIP848:TheNextGenerationoftheConsumerRebalanceProtocol-Admin#describeConsumerGroups].
> On the server side, this mainly requires the following steps:
> # The request/response schemas must be defined (see
> ListGroupsRequest/Response.json for an example);
> # Request/response classes must be defined (see
> ListGroupsRequest/Response.java for an example);
> # The API must be defined in KafkaApis (see
> KafkaApis#handleDescribeGroupsRequest for an example);
> # The GroupCoordinator interface (java file) must be extended for the new
> operations.
> # The new operation must be implemented in GroupCoordinatorService (new
> coordinator in Java) whereas the GroupCoordinatorAdapter (old coordinator in
> Scala) should just reject the request.
> We could probably do 1) and 2) in one pull request and the remaining ones in
> another.
> On the admin client side, this mainly requires the followings steps:
> * Define all the new java classes as defined in the KIP.
> * Add the new API to KafkaAdminClient class.
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