jolshan commented on code in PR #15486:
URL: https://github.com/apache/kafka/pull/15486#discussion_r1518064096


##########
core/src/main/scala/kafka/server/AddPartitionsToTxnManager.scala:
##########
@@ -228,11 +232,17 @@ class AddPartitionsToTxnManager(
                 val tp = new TopicPartition(topicResult.name, 
partitionResult.partitionIndex)
                 if (partitionResult.partitionErrorCode != Errors.NONE.code) {
                   // Producers expect to handle INVALID_PRODUCER_EPOCH in this 
scenario.
-                  val code =
+                  var code =
                     if (partitionResult.partitionErrorCode == 
Errors.PRODUCER_FENCED.code)
                       Errors.INVALID_PRODUCER_EPOCH.code
                     else
                       partitionResult.partitionErrorCode
+                  // For backward compatibility with clients.

Review Comment:
   nice 👍 



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