dongnuo123 commented on code in PR #15798:
URL: https://github.com/apache/kafka/pull/15798#discussion_r1583634669
##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java:
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@@ -1288,25 +1353,15 @@ private
CoordinatorResult<ConsumerGroupHeartbeatResponseData, Record> consumerGr
.maybeUpdateSubscribedTopicNames(Optional.ofNullable(subscribedTopicNames))
.setClientId(clientId)
.setClientHost(clientHost)
+ .setClassicMemberMetadata(null)
Review Comment:
Our default value is already null. This is necessary as
`updatedMemberBuilder = new ConsumerGroupMember.Builder(member)` can have
non-null classicMemberMetadata and we need it to update the members that have
changed from the classic protocol to the consumer protocol.
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