DL1231 commented on code in PR #19577:
URL: https://github.com/apache/kafka/pull/19577#discussion_r2447014064


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/CommitRequestManager.java:
##########
@@ -732,7 +740,9 @@ public NetworkClientDelegate.UnsentRequest 
toUnsentRequest() {
                 lastEpochSentOnCommit = Optional.empty();
             }
 
-            OffsetCommitRequest.Builder builder = 
OffsetCommitRequest.Builder.forTopicNames(data);
+            OffsetCommitRequest.Builder builder = canUseTopicIds
+                    ? OffsetCommitRequest.Builder.forTopicIdsOrNames(data, 
true)
+                    : OffsetCommitRequest.Builder.forTopicNames(data);

Review Comment:
    > I'm afraid we cannot simply move on and generate a request forTopicNames 
using the last stable version.
   
   The `forTopicNames` uses version 9 to create the request, so it will not 
fail.
   
https://github.com/apache/kafka/blob/92d9dc19b22529895c430bf2551b551cbfbcaad1/clients/src/main/java/org/apache/kafka/common/requests/OffsetCommitRequest.java#L58-L60
   
   > So, should we just request metadata and return? 
   
   If no topic ID is available and only a metadata request is generated without 
producing the actual commit request, this could result in permanent failure of 
OffsetCommit requests for older servers (e.g., version 2.7) that do not support 
topic IDs.
   



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