zhengyd2014 commented on code in PR #14444:
URL: https://github.com/apache/kafka/pull/14444#discussion_r1336412576


##########
clients/src/main/java/org/apache/kafka/common/requests/FetchResponse.java:
##########
@@ -276,11 +289,16 @@ private static FetchResponseData toMessage(Errors error,
                     .setPartitions(partitionResponses));
             }
         }
-
-        return new FetchResponseData()
-            .setThrottleTimeMs(throttleTimeMs)
-            .setErrorCode(error.code())
-            .setSessionId(sessionId)
-            .setResponses(topicResponseList);
+        data.setThrottleTimeMs(throttleTimeMs)
+                .setErrorCode(error.code())
+                .setSessionId(sessionId)
+                .setResponses(topicResponseList);
+        nodeEndpoints.forEach(endpoint -> data.nodeEndpoints().add(

Review Comment:
   I don't think we need to populate nodeEndpoints field for all the 
Fetch/Produce response, which has certain overhead.  to my understanding, the 
info needed only for error condition.



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