jolshan commented on code in PR #18604:
URL: https://github.com/apache/kafka/pull/18604#discussion_r1925801892
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core/src/main/scala/kafka/log/UnifiedLog.scala:
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@@ -600,6 +600,11 @@ class UnifiedLog(@volatile var logStartOffset: Long,
*/
def hasOngoingTransaction(producerId: Long, producerEpoch: Short): Boolean =
lock synchronized {
val entry = producerStateManager.activeProducers.get(producerId)
+ // With transactions V2, if we see a future epoch, we are likely in the
process of completing the previous transaction.
Review Comment:
Hmmm. We can see a future epoch in the case where the next transaction has
started while the previous one is completing. For V2 this can happen due to the
reordering of handling the produce and add partitions
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