jolshan commented on code in PR #17402:
URL: https://github.com/apache/kafka/pull/17402#discussion_r1792359672
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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:
There is no reason to do this if we already received the response. I'd argue
we shouldn't do that especially if the response was no error.
My understanding is that we don't over optimize the downgrade path.
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