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https://issues.apache.org/jira/browse/NIFI-1408?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15105717#comment-15105717
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Matt Gilman commented on NIFI-1408:
-----------------------------------
FlowFile's are present in a queue until the follow-on component transfers them
to a downstream queue. I believe what is happening in this example is that
MergeContent is actively working the FlowFiles which explains why they are not
being dropped. MergeContent has not received enough FlowFiles to trigger the
merge and transfer downstream. Could you attempt to replicate the issue with
MergeContent stopped or a different Processor that doesn't 'hold' FlowFiles
until reaching some condition.
> 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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