OmniaGM commented on code in PR #19964:
URL: https://github.com/apache/kafka/pull/19964#discussion_r2152650081


##########
clients/src/main/java/org/apache/kafka/clients/producer/internals/Sender.java:
##########
@@ -609,7 +607,14 @@ private void handleProduceResponse(ClientResponse 
response, Map<TopicPartition,
                                 .collect(Collectors.toList()),
                             p.errorMessage(),
                             p.currentLeader());
-                    ProducerBatch batch = batches.get(tp);
+                    // Version 13 drop topic name and add support to topic id.
+                    // We need to find batch based on topic id and partition 
index only as
+                    // topic name in the response might be empty.
+                    ProducerBatch batch = batches.entrySet().stream()
+                            .filter(entry ->
+                                    entry.getKey().same(new 
TopicIdPartition(r.topicId(), p.index(), r.name()))
+                            
).map(Map.Entry::getValue).findFirst().orElse(null);

Review Comment:
   We always had this potentail of batch is null this why I raised the comment 
here https://github.com/apache/kafka/pull/19964#discussion_r2152281872 that 
should we have IllegalStateException. I have throw IllegalStateException 
instead of leaving it like this 



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