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https://issues.apache.org/jira/browse/NIFI-11388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17709034#comment-17709034
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Pierre Villard commented on NIFI-11388:
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I believe it would also highly depend on how your "(some processor)" is working.
I don't believe you can have the same observation just with a flow like GFF ->
UpdateAttribute -> UpdateAttribute -> UpdateAttribute.
> Backpressure queue settings loosely followed
> --------------------------------------------
>
> Key: NIFI-11388
> URL: https://issues.apache.org/jira/browse/NIFI-11388
> Project: Apache NiFi
> Issue Type: Improvement
> Reporter: Nissim Shiman
> Priority: Major
>
> The backpressure settings on connections between processors are only loosely
> followed. More flowfiles can end up on queues than configured via
> backpressure setting.
> For example, set up flow:
> GenerateFlowFile -> UpdateAttribute -> (some processor)
> where
> GenerateFlowFile has _Custom Text_ set to be _hello_
> and Run Schedule is set to be _0 min_
> and
> the connection following UpdateAttribute has _Back Pressure Object Threshold_
> set to be _100_
> Start GenerateFlowFile.
> Wait a few moments until outgoing connection fills up.
> Start UpdateAttribute
> OutGoing conection will have more than 100 flowfiles on it
> (I had over 1000 on mine when running these steps)
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