Guozhang Wang created KAFKA-6791:

             Summary: Add a CoordinatorNodeProvider in KafkaAdminClient
                 Key: KAFKA-6791
             Project: Kafka
          Issue Type: Improvement
          Components: admin
            Reporter: Guozhang Wang

As we add more and more coordinator-related requests to the admin client, we 
can consider adding a CoordinatorNodeProvider to consolidate the common logic 
pattern of finding the coordinator first, then send the corresponding request.

Note that 1) with this provider interface it is almost not possible to batch 
multiple groupIds per coordinator; there has to be a little more refactoring to 
make it work. 2) for some requests like list consumers, group ids are not known 
beforehand and hence we cannot use this provider as well.

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