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https://issues.apache.org/jira/browse/NIFI-4715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16299147#comment-16299147
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Milan Das commented on NIFI-4715:
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yes. Agree multi thread doesn't exist. Root cause is different.
> ListS3 list duplicate files when incoming file throughput to S3 is high
> ------------------------------------------------------------------------
>
> Key: NIFI-4715
> URL: https://issues.apache.org/jira/browse/NIFI-4715
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Affects Versions: 1.2.0, 1.3.0, 1.4.0
> Environment: All
> Reporter: Milan Das
> Attachments: List-S3-dup-issue.xml, screenshot-1.png
>
>
> ListS3 state is implemented using HashSet. HashSet is not thread safe. When
> ListS3 operates in multi threaded mode, sometimes it tries to list same
> file from S3 bucket. Seems like HashSet data is getting corrupted.
> currentKeys = new HashSet<>(); // need to be implemented Thread Safe like
> currentKeys = //ConcurrentHashMap.newKeySet();
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