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https://issues.apache.org/jira/browse/NIFI-10823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17634583#comment-17634583
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Ryan Hendrickson commented on NIFI-10823:
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I have lots of backpressure wishes :)
Aren't the holidays coming soon? We need a holiday edition of NiFi!
> Backpressure Queue - Properties file vs. Canvas update, Properties file not
> respected.
> --------------------------------------------------------------------------------------
>
> Key: NIFI-10823
> URL: https://issues.apache.org/jira/browse/NIFI-10823
> Project: Apache NiFi
> Issue Type: Bug
> Affects Versions: 1.14.0, 1.15.0, 1.16.0, 1.16.3
> Reporter: Ryan Hendrickson
> Assignee: Mark Payne
> Priority: Major
>
> I assigned this to Mark so he'd take notice since we were chatting about this
> on the Apache NiFi Slack Channel:
> [https://apachenifi.slack.com/archives/C0L9VCD47/p1668546036757219]
> We have been setting the following two nifi.properties for quite some time...
> * nifi.queue.backpressure.count=20000
> * nifi.queue.swap.threshold=20000
> Today we updated the dataflow on with a NiFi that can have a huge amount of
> FlowFiles queue up if backpressure isn't set correctly. We realized that the
> new relationships drawn on the canvas did not inherit the
> nifi.queue.backpressure.count set in nifi.properties. (Discussion on Slack)
> Hunting back, it looks like NIFI-8195 in NiFi 1.14.0 attempted to Migrate
> backpressure settings from nifi.properties to the Process Groups in the UI.
>
> # It looks like in the Pull Request, it was intended to read the
> nifi.properties file value and set that to the root process group value.
> ## [https://github.com/apache/nifi/pull/5192,]
> ## "verified the default values of the added elements are “0 sec” for
> FlowFile Expiration, and obtained from nifi.properties for back pressure
> settings" and
> ## "The backpressure defaults from nifi.properties should only be used when
> at the root level"
> ## Still in the code:
> [https://github.com/apache/nifi/blob/main/nifi-commons/nifi-properties/src/main/java/org/apache/nifi/util/NiFiProperties.java#L90]
> # The Migration Guidance from 1.14.0 doesn't say anything about the
> nifi.properties `nifi.queue.backpressure.count` no longer being used.
> [https://cwiki.apache.org/confluence/display/NIFI/Migration+Guidance]
> # The core properties still have it listed:
> [https://nifi.apache.org/docs/nifi-docs/html/administration-guide.html#core-properties]
>
>
> Version: Apache NiFi 1.16.3 Stanealone and Cluster
> *We observed that when the nifi.properties value is set, the UI sets the
> value to 0 (unlimited), and every process group underneath there.*
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