DL1231 commented on code in PR #19577:
URL: https://github.com/apache/kafka/pull/19577#discussion_r2122399155


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/CommitRequestManager.java:
##########
@@ -698,15 +699,22 @@ class OffsetCommitRequestState extends 
RetriableRequestState {
         }
 
         public NetworkClientDelegate.UnsentRequest toUnsentRequest() {
+            Map<String, Uuid> topicIds = metadata.topicIds();
+            boolean canUseTopicIds = true;
             Map<String, OffsetCommitRequestData.OffsetCommitRequestTopic> 
requestTopicDataMap = new HashMap<>();
             for (Map.Entry<TopicPartition, OffsetAndMetadata> entry : 
offsets.entrySet()) {
                 TopicPartition topicPartition = entry.getKey();
                 OffsetAndMetadata offsetAndMetadata = entry.getValue();
+                Uuid topicId = topicIds.getOrDefault(topicPartition.topic(), 
Uuid.ZERO_UUID);
+                if (topicId.equals(Uuid.ZERO_UUID)) {
+                    canUseTopicIds = false;
+                }
 
                 OffsetCommitRequestData.OffsetCommitRequestTopic topic = 
requestTopicDataMap
                     .getOrDefault(topicPartition.topic(),
                         new OffsetCommitRequestData.OffsetCommitRequestTopic()
                             .setName(topicPartition.topic())
+                            .setTopicId(topicId)

Review Comment:
   Thanks for explaining, I get it now.



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