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https://issues.apache.org/jira/browse/KAFKA-5756?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Gustafson resolved KAFKA-5756.
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Resolution: Fixed
Fix Version/s: 0.11.0.1
1.0.0
Issue resolved by pull request 3702
[https://github.com/apache/kafka/pull/3702]
> Synchronization issue on flush
> ------------------------------
>
> Key: KAFKA-5756
> URL: https://issues.apache.org/jira/browse/KAFKA-5756
> Project: Kafka
> Issue Type: Bug
> Components: KafkaConnect
> Affects Versions: 0.10.2.0
> Reporter: Oleg Kuznetsov
> Fix For: 1.0.0, 0.11.0.1
>
>
> Access to *OffsetStorageWriter#toFlush* is not synchronized in *doFlush()*
> method, whereas this collection can be accessed from 2 different threads:
> - *WorkerSourceTask.execute()*, finally block
> - *SourceTaskOffsetCommitter*, from periodic flush task
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