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https://issues.apache.org/jira/browse/NIFI-1271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15046255#comment-15046255
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Mark Payne commented on NIFI-1271:
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[~aldrin] - I can replicate the issue. I have an idea of what the problem
likely is and will try to address in the morning. I think it is similar to the
problem that we had a while back where Funnels did something similar.
> Output Port of an inner process group has high CPU utilization when there is
> backpressure
> -----------------------------------------------------------------------------------------
>
> Key: NIFI-1271
> URL: https://issues.apache.org/jira/browse/NIFI-1271
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Core Framework
> Affects Versions: 0.3.0
> Reporter: Aldrin Piri
> Priority: Minor
> Attachments: NIFI-1271_-_Output_Port_CPU_Usage.xml
>
>
> Related to the template that drew out the issue with DistributeLoad in
> NIFI-1269, noticed that the computer was working fairly hard despite
> backpressure throughout the system effectively stopping processing/ingest.
> After going through the system, it seemed this was related solely to the
> output port of the process group. Toggling this directly went from near zero
> cpu usage to a much higher level of consumption.
> Will attach a template. To recreate, have the entirety of the processing
> path get backpressure to the point of ingest with GetFile. At this point,
> all components can be stopped. Toggling the Ingest File Stream output port
> will show the high level CPU usage.
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