OmniaGM commented on code in PR #19964:
URL: https://github.com/apache/kafka/pull/19964#discussion_r2152281872


##########
clients/src/main/java/org/apache/kafka/clients/producer/internals/Sender.java:
##########
@@ -609,7 +607,22 @@ private void handleProduceResponse(ClientResponse 
response, Map<TopicPartition,
                                 .collect(Collectors.toList()),
                             p.errorMessage(),
                             p.currentLeader());
-                    ProducerBatch batch = batches.get(tp);
+                    ProducerBatch batch = null;
+                    // 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.
+                    List<ProducerBatch> matchedBatchesForTopicId = 
batches.entrySet().stream()
+                            .filter(entry -> entry.getKey().same(new 
TopicIdPartition(r.topicId(), p.index(), r.name())))
+                            .map(Map.Entry::getValue)
+                            .collect(Collectors.toList());
+
+                    if (matchedBatchesForTopicId.size() > 1) {
+                        matchedBatchesForTopicId.forEach(matchedBatch ->
+                                failBatch(matchedBatch, new 
RuntimeException("More than one batch with same topic id and partition."), 
false));

Review Comment:
   Removed this now in favour of using first find. I am just thinking should we 
in general return IllegalStateException if batch is null?



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