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https://issues.apache.org/jira/browse/NIFI-1408?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15106875#comment-15106875
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Matt Gilman commented on NIFI-1408:
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I've created the JIRA for adding the distinction between being processed and
waiting while being queued [1].
Also, stopping the follow-on processor (and waiting for the active threads to
complete) should allow the FlowFiles to be purged successfully. I'm not sure we
can safely delete a FlowFile that is actively being processed by the downstream
component.
[1] https://issues.apache.org/jira/browse/NIFI-1410
> Unable to purge message from queue
> ----------------------------------
>
> Key: NIFI-1408
> URL: https://issues.apache.org/jira/browse/NIFI-1408
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Affects Versions: 0.4.0
> Reporter: Louis-Etienne Dorval
> Attachments: nifi_empty_queue_1.png, nifi_empty_queue_2.png
>
>
> Recently, I tried purging a queue that has 2 different relationships
> associated to it. It was able to purge some FlowFile but not all of them.
> I'll upload screenshot to explain what was the 2 processors.
> I havent seen any stacktrace in the logs.
> I was not able to reproduce it since then, but I could try again if that's of
> any help
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