jolshan commented on code in PR #17402:
URL: https://github.com/apache/kafka/pull/17402#discussion_r1795920224
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clients/src/main/java/org/apache/kafka/clients/producer/internals/TransactionManager.java:
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@@ -1568,6 +1571,17 @@ public void handleResponse(AbstractResponse response) {
Errors error = endTxnResponse.error();
if (error == Errors.NONE) {
+ // For transaction version 5+, the broker includes the
producerId and producerEpoch in the EndTxnResponse.
+ // KIP-890 Part 2 mandates bumping the epoch after every
transaction. If the epoch overflows,
+ // a new producerId is returned with epoch set to 0.
+ if (isTransactionV2Enabled) {
Review Comment:
For this part
> The client sends the EndTxn version 4
Do we not force sending version 5? I think we may want to do that and get
UnsupportedVersionException rather than switch the protocol mid transaction.
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