Yishun Guan created KAFKA-7206:
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             Summary: Enable batching in FindCoordinator
                 Key: KAFKA-7206
                 URL: https://issues.apache.org/jira/browse/KAFKA-7206
             Project: Kafka
          Issue Type: Improvement
          Components: admin
            Reporter: Yishun Guan


To quote [~guozhang]

"The proposal is that, we extend FindCoordinatorRequest to have multiple 
consumer ids: today each FindCoordinatorRequest only contains a single consumer 
id, so in our scenario we need to send N request for N consumer groups still. 
If we can request for coordinators in a single request, then the workflow could 
be simplified to:
 # send a single FindCoordinatorRequest to a broker asking for coordinators of 
all consumer groups.
1.a) note that the response may still succeed in finding some coordinators 
while error on others, and we need to handle them on that granularity (see 
below).
 # and then for the collected coordinator, group them by coordinator id and 
send one request per coordinator destination.

Note that this change would require the version to be bumped up, to 
{{FIND_COORDINATOR_REQUEST_V3}}for such protocol changes, also the RESPONSE 
version should be bumped up in order to include multiple coordinators."



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