JimmyWang6 commented on code in PR #19820:
URL: https://github.com/apache/kafka/pull/19820#discussion_r2220755722


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupCoordinatorService.java:
##########
@@ -709,15 +709,47 @@ CompletableFuture<AlterShareGroupOffsetsResponseData> 
persisterInitialize(
                         
handlePersisterInitializeResponse(request.groupTopicPartitionData().groupId(), 
result, new ShareGroupHeartbeatResponseData());
                         return response;
                     } else {
-                        //TODO build new AlterShareGroupOffsetsResponseData 
for error response
-                        return response;
+                        return buildErrorResponse(response, result);
                     }
                 } else {
                     return buildErrorResponse(request, response, exp);
                 }
 
             });
     }
+    
+    private AlterShareGroupOffsetsResponseData 
buildErrorResponse(AlterShareGroupOffsetsResponseData response, 
InitializeShareGroupStateResult result) {
+        AlterShareGroupOffsetsResponseData data = new 
AlterShareGroupOffsetsResponseData();
+        data.setResponses(
+            new 
AlterShareGroupOffsetsResponseData.AlterShareGroupOffsetsResponseTopicCollection(response.responses().stream()
+                .map(topic -> {
+                    
AlterShareGroupOffsetsResponseData.AlterShareGroupOffsetsResponseTopic 
topicData = new 
AlterShareGroupOffsetsResponseData.AlterShareGroupOffsetsResponseTopic()
+                        .setTopicName(topic.topicName());
+                    Map<Uuid, Map<Integer, PartitionErrorData>> 
topicPartitionErrorsMap = result.getErrors();
+                    topic.partitions().forEach(partition -> {
+                        if (partition.errorCode() != Errors.NONE.code()) {
+                            topicData.partitions().add(partition);
+                            return;
+                        }
+                        
AlterShareGroupOffsetsResponseData.AlterShareGroupOffsetsResponsePartition 
partitionData;
+                        PartitionErrorData error = 
topicPartitionErrorsMap.get(topic.topicId()).get(partition.partitionIndex());
+                        if (error == null) {
+                            partitionData = new 
AlterShareGroupOffsetsResponseData.AlterShareGroupOffsetsResponsePartition()

Review Comment:
   Good idea, I have change to use partition.duplicate() to build the response.



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