lbradstreet commented on code in PR #20061:
URL: https://github.com/apache/kafka/pull/20061#discussion_r2188817416


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupCoordinatorService.java:
##########
@@ -1921,14 +1921,14 @@ private 
CompletableFuture<DeleteShareGroupOffsetsResponseData> handleDeleteShare
                 errorTopicResponses.add(
                     new 
DeleteShareGroupOffsetsResponseData.DeleteShareGroupOffsetsResponseTopic()
                         .setTopicId(topicData.topicId())
-                        
.setTopicName(metadataImage.topics().topicIdToNameView().get(topicData.topicId()))
+                        
.setTopicName(metadataImage.topicName(topicData.topicId()).orElse("<UNKNOWN>"))

Review Comment:
   Hmm, I was going to say that an error code should be set, but this is the 
error case anyway. I guess if the current behavior is to return null then I 
guess we should still return null.



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