riedelmax commented on code in PR #14544:
URL: https://github.com/apache/kafka/pull/14544#discussion_r1367392319


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java:
##########
@@ -444,6 +445,43 @@ public List<ListGroupsResponseData.ListedGroup> 
listGroups(List<String> statesFi
         return groupStream.map(group -> 
group.asListedGroup(committedOffset)).collect(Collectors.toList());
     }
 
+
+    public List<ConsumerGroupDescribeResponseData.DescribedGroup> 
consumerGroupDescribe(
+        List<String> groupIds
+    ) {
+        List<ConsumerGroupDescribeResponseData.DescribedGroup> response = new 
ArrayList<>();
+
+        for (String groupId: groupIds) {
+            Group group = groups.get(groupId);
+
+            ConsumerGroupDescribeResponseData.DescribedGroup describedGroup = 
new ConsumerGroupDescribeResponseData.DescribedGroup()
+                .setGroupId(groupId);
+
+            if (group == null || !CONSUMER.equals(group.type())) {
+                // We don't support upgrading/downgrading between protocols at 
the moment so
+                // we set an error if a group exists with the wrong type.
+                
describedGroup.setErrorMessage(Errors.INVALID_GROUP_ID.message());
+                describedGroup.setErrorCode(Errors.INVALID_GROUP_ID.code());
+            } else {
+                ConsumerGroup consumerGroup = (ConsumerGroup) group;
+                describedGroup.setGroupState(consumerGroup.stateAsString())
+                    .setGroupEpoch(consumerGroup.groupEpoch())
+                    .setAssignmentEpoch(consumerGroup.assignmentEpoch())
+                    .setAssignorName(
+                        consumerGroup.preferredServerAssignor().isPresent() ?
+                            consumerGroup.preferredServerAssignor().get() : 
null

Review Comment:
   But it is still the preferredServerAssignor we set as assignorName?



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