CalvinConfluent commented on code in PR #17698:
URL: https://github.com/apache/kafka/pull/17698#discussion_r1843034902


##########
core/src/main/scala/kafka/coordinator/transaction/TransactionCoordinator.scala:
##########
@@ -610,7 +610,17 @@ class TransactionCoordinator(txnConfig: TransactionConfig,
                 else
                   logInvalidStateTransitionAndReturnError(transactionalId, 
txnMetadata.state, txnMarkerResult)
               case Empty =>
-                logInvalidStateTransitionAndReturnError(transactionalId, 
txnMetadata.state, txnMarkerResult)
+                if (clientTransactionVersion.supportsEpochBump() && 
!txnMetadata.pendingState.contains(PrepareEpochFence)) {

Review Comment:
   Abort on CompleteAbort is already supported. Added the abort on 
CompleteCommit



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