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https://issues.apache.org/jira/browse/NIFI-11388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17709041#comment-17709041
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Nissim Shiman commented on NIFI-11388:
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Thank you [~joewitt] and [~pvillard] for your responses.
I noticed this when testing the current 1.21.0 RC2, but the queue did always
stop after a moment ot two anyway so the basic idea of queues having
backpressure is certainly working.
Thank you for letting me know the current way it is working is by design. This
works for me.
Thank You!
> 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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