[jira] [Created] (KAFKA-15533) Ensure HeartbeatRequestManager only send out some fields once

[Philip Nee (Jira)]

Philip Nee created KAFKA-15533:
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             Summary: Ensure HeartbeatRequestManager only send out some fields 
once
                 Key: KAFKA-15533
                 URL: https://issues.apache.org/jira/browse/KAFKA-15533
             Project: Kafka
          Issue Type: Bug
            Reporter: Philip Nee
            Assignee: Philip Nee


We want to ensure ConsumerGroupHeartbeatRequest is as lightweight as possible, 
so a lot of fields in it don't need to be resend. An example would be the 
rebalanceTimeoutMs, currently we have the following code:

 

 
{code:java}
ConsumerGroupHeartbeatRequestData data = new ConsumerGroupHeartbeatRequestData()
    .setGroupId(membershipManager.groupId())
    .setMemberEpoch(membershipManager.memberEpoch())
    .setMemberId(membershipManager.memberId())
    .setRebalanceTimeoutMs(rebalanceTimeoutMs); {code}
 

 

We should encapsulate these once-used fields into a class such as 
HeartbeatMetdataBuilder, and it should maintain a state of whether a certain 
field needs to be sent or not.

 

Note that, currently only 3 fields are mandatory in the request:
 * groupId
 * memberEpoch
 * memberId



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