squah-confluent commented on code in PR #22510:
URL: https://github.com/apache/kafka/pull/22510#discussion_r3491526741


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java:
##########
@@ -3900,24 +3901,23 @@ private UpdateTargetAssignmentResult<Assignment> 
maybeUpdateTargetAssignment(
             updatedMember
         ).orElse(defaultConsumerGroupAssignor.name());
         try {
+            UpdatedMembersAndTargetAssignmentView<ConsumerGroupMember, 
Assignment> updatedMembersAndTargetAssignment =
+                new UpdatedMembersAndTargetAssignmentView<>(
+                    group.members(),
+                    group.staticMembers(),
+                    group.targetAssignment()
+                );
+            
updatedMembersAndTargetAssignment.addOrUpdateMember(updatedMember.memberId(), 
updatedMember.instanceId(), updatedMember);
+
             TargetAssignmentBuilder.ConsumerTargetAssignmentBuilder 
assignmentResultBuilder =
                 new 
TargetAssignmentBuilder.ConsumerTargetAssignmentBuilder(group.groupId(), 
groupEpoch, consumerGroupAssignors.get(preferredServerAssignor))
                     .withTime(time)
-                    .withMembers(group.members())
-                    .withStaticMembers(group.staticMembers())
+                    .withMembers(updatedMembersAndTargetAssignment.members())
                     .withSubscriptionType(subscriptionType)
-                    .withTargetAssignment(group.targetAssignment())
+                    
.withTargetAssignment(updatedMembersAndTargetAssignment.targetAssignment())

Review Comment:
   Thanks for the review. I filed https://github.com/apache/kafka/pull/22698 
for the new test



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