CalvinConfluent commented on code in PR #17698:
URL: https://github.com/apache/kafka/pull/17698#discussion_r1854568831
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core/src/main/scala/kafka/coordinator/transaction/TransactionCoordinator.scala:
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@@ -498,6 +498,45 @@ class TransactionCoordinator(txnConfig: TransactionConfig,
requestLocal)
}
+ /*
+ The state transition for Empty, CompleteAbort, CompleteCommit is
complicated, so here is a table to make it clear.
+ Note:
+ PF = PRODUCER_FENCED
+ ITS = INVALID_TXN_STATE
+ NONE = No error and no epoch bump
+ EB = No error and epoch bump
+
+ Retry => producerEpoch = txnState.ProducerEpoch - 1
+ Current => producerEpoch = txnState.ProducerEpoch
+ ------------------------------------------------------
+ With transaction V1.
+ +----------------+-----------------+-----------------+
+ | | Abort | Commit |
+ +----------------+-------+---------+-------+---------+
+ | | Retry | Current | Retry | Current |
+ +----------------+-------+---------+-------+---------+
+ | Empty | PF | ITS | PF | ITS |
+ +----------------+-------+---------+-------+---------+
+ | CompleteAbort | PF | NONE | PF | ITS |
+ +----------------+-------+---------+-------+---------+
+ | CompleteCommit | PF | ITS | PF | NONE |
+ +----------------+-------+---------+-------+---------+
+
+ With transaction V2.
+ +----------------+-----------------+-----------------+
+ | | Abort | Commit |
+ +----------------+-------+---------+-------+---------+
+ | | Retry | Current | Retry | Current |
+ +----------------+-------+---------+-------+---------+
+ | Empty | PF | EB | ITS | ITS |
Review Comment:
Retry is a very special type of epoch not match which is current epoch - 1.
I guess it can happen if the client does not receive the response.
> For commit, the "retry" case is "PF".
Why is that? I think the client may just resend a commit request, so the
server can respond with the current epoch.
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