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https://issues.apache.org/jira/browse/KAFKA-5756?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17689450#comment-17689450
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Chris Egerton commented on KAFKA-5756:
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I've merged Greg's fix and updated the fix version to 3.5.0, since this issue
was not fully addressed before that fix.
> 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
> Assignee: Greg Harris
> Priority: Major
> Fix For: 3.5.0
>
>
> 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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