dajac commented on code in PR #13231:
URL: https://github.com/apache/kafka/pull/13231#discussion_r1122921475


##########
clients/src/main/java/org/apache/kafka/clients/producer/internals/TransactionManager.java:
##########
@@ -1328,7 +1328,7 @@ Priority priority() {
         @Override
         public void handleResponse(AbstractResponse response) {
             AddPartitionsToTxnResponse addPartitionsToTxnResponse = 
(AddPartitionsToTxnResponse) response;
-            Map<TopicPartition, Errors> errors = 
addPartitionsToTxnResponse.errors();
+            Map<TopicPartition, Errors> errors = 
addPartitionsToTxnResponse.errors().get(AddPartitionsToTxnResponse.V3_AND_BELOW_TXN_ID);

Review Comment:
   Yeah, the check is probably not necessary. By the way, I find the idea of 
having `V3_AND_BELOW_TXN_ID` for old version a bit confusing. I was wondering 
if using `addPartitionsToTxnResponse.data().resultsByTopicV3AndBelow()` would 
be a better alternative here. We only iterate over the Map so the Map is not 
strictly required here. Have you considered something like this?



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