guozhangwang commented on a change in pull request #8549:
URL: https://github.com/apache/kafka/pull/8549#discussion_r468900386



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File path: 
core/src/main/scala/kafka/coordinator/transaction/TransactionCoordinator.scala
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@@ -539,7 +539,7 @@ class TransactionCoordinator(brokerId: Int,
           s"${txnIdAndPidEpoch.transactionalId} due to timeout")
 
       case error@(Errors.INVALID_PRODUCER_ID_MAPPING |
-                  Errors.INVALID_PRODUCER_EPOCH |

Review comment:
       My confusion was that for new broker <-> new client communication, could 
we still return `INVALID_PRODUCER_EPOCH` as the error code? From KIP-588 my 
understanding is that, txn-coordinator -> producer would not return 
`INVALID_PRODUCER_EPOCH` anymore for all txn-related requests, and only broker 
-> producer ProduceResponse would return `INVALID_PRODUCER_EPOCH`. Now I get 
that you are maintaining the javadoc / handling for compatibility. So we are 
good :)




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