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https://issues.apache.org/jira/browse/NIFI-4372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16191947#comment-16191947
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Mark Payne commented on NIFI-4372:
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[~pvillard] after looking into this more, I appear to have misunderstood how
the Wait processor was working. Based on the design of it, adding a
FirstInFirstOut prioritizer is definitely necessary, regardless of the issue
that I mentioned above.
> Wait processor - recommend prioritizer in documentation
> -------------------------------------------------------
>
> Key: NIFI-4372
> URL: https://issues.apache.org/jira/browse/NIFI-4372
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Documentation & Website, Extensions
> Reporter: Pierre Villard
> Assignee: Pierre Villard
> Priority: Trivial
> Labels: documentation
>
> When using the Wait processor, the use of a connection prioritizer (FIFO for
> instance) on the wait relationship should be recommended in the processor
> documentation. When having tens of thousands of flow files in the wait
> relationship, not using a prioritizer could lead to flow files not being
> released when signal is notified and generate expired flow files.
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