junrao commented on code in PR #19964:
URL: https://github.com/apache/kafka/pull/19964#discussion_r2154081661


##########
clients/src/main/java/org/apache/kafka/clients/producer/internals/Sender.java:
##########
@@ -855,7 +860,7 @@ private void sendProduceRequest(long now, int destination, 
short acks, int timeo
         if (batches.isEmpty())
             return;
 
-        final Map<TopicPartition, ProducerBatch> recordsByPartition = new 
HashMap<>(batches.size());
+        final Map<TopicIdPartition, ProducerBatch> recordsByPartition = new 
HashMap<>(batches.size());
         Map<String, Uuid> topicIds = topicIdsForBatches(batches);

Review Comment:
   It's true that `Sender::topicIdsForBatches` could return zero topicId in 
rare cases. It seems that we could just pass along the mapping to zero topicId 
when handling the produce response. 



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