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From "Kostas Kloudas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-8132) FlinkKafkaProducer011 can commit incorrect transaction during recovery
Date Wed, 22 Nov 2017 14:06:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-8132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16262565#comment-16262565
] 

Kostas Kloudas commented on FLINK-8132:
---------------------------------------

This is a bug or a blocker?

> 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. 
> Proposed solution is to postpone returning producers to the pool until we are sure that
previous checkpoint (for which given producer was used) will not be used for recovery (at
least one more checkpoint was completed).



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