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https://issues.apache.org/jira/browse/FLINK-8132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16264348#comment-16264348
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ASF GitHub Bot commented on FLINK-8132:
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Github user aljoscha commented on the issue:
https://github.com/apache/flink/pull/5053
Thanks a lot for fixing this! 👍
Could you please close the PR?
> FlinkKafkaProducer011 can commit incorrect transaction during recovery
> ----------------------------------------------------------------------
>
> Key: FLINK-8132
> URL: https://issues.apache.org/jira/browse/FLINK-8132
> Project: Flink
> Issue Type: Bug
> Components: Kafka Connector
> Reporter: Piotr Nowojski
> Assignee: Piotr Nowojski
> Priority: Blocker
> Fix For: 1.4.0
>
>
> Faulty scenario with producer pool of 2.
> 1. started transaction 1 with producerA, written record 42
> 2. checkpoint 1 triggered, pre committing txn1, started txn2 with producerB,
> written record 43
> 3. checkpoint 1 completed, committing txn1, returning producerA to the pool
> 4. checkpoint 2 triggered , committing txn2, started txn3 with producerA,
> written record 44
> 5. crash....
> 6. recover to checkpoint 1, txn1 from producerA found to
> "pendingCommitTransactions", attempting to recoverAndCommit(txn1)
> 7. unfortunately txn1 and txn3 from the same producers are identical from
> KafkaBroker perspective and thus txn3 is being committed
> result is that both records 42 and 44 are committed.
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