ASF GitHub Bot commented on KAFKA-6058:

guozhangwang opened a new pull request #4856: KAFKA-6058: Refactor consumer API 
result return types
URL: https://github.com/apache/kafka/pull/4856
   Refactored the return types in consumer group APIs the following way:
   Map<TopicPartition, KafkaFuture<Void>> 
   Map<TopicPartition, KafkaFuture<ConsumerGroupDescription>> 
   KafkaFuture<Map<TopicPartition, OffsetAndMetadata>> 
   1. For DeleteConsumerGroupsResult and DescribeConsumerGroupsResult, for each 
group id we have two round-trips to get the coordinator, and then send the 
delete / describe request; I leave the potential optimization of batching 
requests for future work.
   2. For ListConsumerGroupOffsetsResult, it is a simple single round-trip and 
hence the whole map is wrapped as a Future.
   3. ListConsumerGroupsResult, it is the most tricky one: we would only know 
how many futures we should wait for after the first listNode returns, and hence 
I constructed the flattened future in the middle wrapped with the underlying 
map of futures.
   3.a Another big change I made is, we do not return the exception in the 
flattened future if only a few of the nodes returns ERROR code, and instead 
just return the rest of the listings; to use that I added a new `anyOf` 
function in `KafkaFuture`.
   ### Committer Checklist (excluded from commit message)
   - [ ] Verify design and implementation 
   - [ ] Verify test coverage and CI build status
   - [ ] Verify documentation (including upgrade notes)

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> KIP-222: Add "describe consumer groups" and "list consumer groups" to 
> KafkaAdminClient
> --------------------------------------------------------------------------------------
>                 Key: KAFKA-6058
>                 URL: https://issues.apache.org/jira/browse/KAFKA-6058
>             Project: Kafka
>          Issue Type: Improvement
>          Components: clients
>            Reporter: Matthias J. Sax
>            Assignee: Jorge Quilcate
>            Priority: Major
>              Labels: kip-222
>             Fix For: 1.2.0
> {{KafkaAdminClient}} does not allow to get information about consumer groups. 
> This feature is supported by old {{kafka.admin.AdminClient}} though.
> We should add {{KafkaAdminClient#describeConsumerGroups()}} and 
> {{KafkaAdminClient#listConsumerGroup()}}.
> Associated KIP: KIP-222

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