abbccdda commented on a change in pull request #8549:
URL: https://github.com/apache/kafka/pull/8549#discussion_r468694089
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File path:
core/src/main/scala/kafka/coordinator/transaction/TransactionCoordinator.scala
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@@ -539,7 +539,7 @@ class TransactionCoordinator(brokerId: Int,
s"${txnIdAndPidEpoch.transactionalId} due to timeout")
case error@(Errors.INVALID_PRODUCER_ID_MAPPING |
- Errors.INVALID_PRODUCER_EPOCH |
Review comment:
We do return `INVALID_PRODUCER_EPOCH` when the client is in old version,
as they don't recognize the new error code. See `KafkaApis`
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