CalvinConfluent commented on code in PR #17698:
URL: https://github.com/apache/kafka/pull/17698#discussion_r1847491788
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core/src/main/scala/kafka/coordinator/transaction/TransactionCoordinator.scala:
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@@ -610,7 +615,18 @@ class TransactionCoordinator(txnConfig: TransactionConfig,
else
logInvalidStateTransitionAndReturnError(transactionalId,
txnMetadata.state, txnMarkerResult)
case Empty =>
- logInvalidStateTransitionAndReturnError(transactionalId,
txnMetadata.state, txnMarkerResult)
+ if (txnMarkerResult == TransactionResult.ABORT &&
clientTransactionVersion.supportsEpochBump() &&
+ !txnMetadata.pendingState.contains(PrepareEpochFence)) {
+ // If the client and server both use transaction V2, the
client is allowed to abort
+ // transactions when the transaction state is Empty because
the client can't be sure about the
+ // current transaction state.
+ // Note that, we should not use txnMetadata info to check if
the client is using V2 because the
+ // only request received by server so far is InitProducerId
request which does not tell whether
Review Comment:
updated.
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