jolshan commented on code in PR #20534:
URL: https://github.com/apache/kafka/pull/20534#discussion_r2379691821
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storage/src/main/java/org/apache/kafka/storage/internals/log/UnifiedLog.java:
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@@ -1385,10 +1385,19 @@ private AnalyzeAndValidateProducerStateResult
analyzeAndValidateProducerState(Lo
// transaction is completed or aborted. We can guarantee
the transaction coordinator knows about the transaction given step 1 and that
the transaction is still
// ongoing. If the transaction is expected to be ongoing,
we will not set a VerificationGuard. If the transaction is aborted,
hasOngoingTransaction is false and
// requestVerificationGuard is the sentinel, so we will
throw an error. A subsequent produce request (retry) should create verification
state and return to phase 1.
- if (batch.isTransactional()
- && !hasOngoingTransaction(batch.producerId(),
batch.producerEpoch())
- && batchMissingRequiredVerification(batch,
requestVerificationGuard)) {
- throw new InvalidTxnStateException("Record was not
part of an ongoing transaction");
+ if (batch.isTransactional() &&
!hasOngoingTransaction(batch.producerId(), batch.producerEpoch())) {
+ // Check epoch first: if producer epoch is stale,
throw recoverable InvalidProducerEpochException.
+ ProducerStateEntry entry =
producerStateManager.activeProducers().get(batch.producerId());
+ if (entry != null && batch.producerEpoch() <
entry.producerEpoch()) {
Review Comment:
That is not necessary true as the epoch can increase in the records compared
to the state that is stored locally. (Calling init producer id for transactions
bumps the producer epoch for example without updating the producer state)
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