jolshan commented on code in PR #15968:
URL: https://github.com/apache/kafka/pull/15968#discussion_r1643560273


##########
clients/src/main/java/org/apache/kafka/clients/producer/internals/Sender.java:
##########
@@ -891,11 +900,20 @@ private void sendProduceRequest(long now, int 
destination, short acks, int timeo
             // which is supporting the new magic version to one which doesn't, 
then we will need to convert.
             if (!records.hasMatchingMagic(minUsedMagic))
                 records = batch.records().downConvert(minUsedMagic, 0, 
time).records();
-            ProduceRequestData.TopicProduceData tpData = tpd.find(tp.topic());
+            ProduceRequestData.TopicProduceData tpData = canUseTopicId ?
+                    tpd.find(tp.topic(), topicIds.get(tp.topic())) :
+                    tpd.find(new 
ProduceRequestData.TopicProduceData().setName(tp.topic()));
+
             if (tpData == null) {
-                tpData = new 
ProduceRequestData.TopicProduceData().setName(tp.topic());
+                tpData = new ProduceRequestData.TopicProduceData();
                 tpd.add(tpData);
             }
+            if (canUseTopicId) {

Review Comment:
   nit: would we also want this in the above block so we don't set each time?



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