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https://issues.apache.org/jira/browse/NIFI-810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14908618#comment-14908618
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Rob Moran commented on NIFI-810:
--------------------------------
{quote}
if a Processor has no incoming connections but is started, it will continually
without ever accomplishing anything.
{quote}
In the UI I believe it would make sense to a user to flag that processor as
invalid and display the alert icon (yellow triangle). The tooltip could state
something like:
_A required upstream connection to this processor is not present._
I’ll make additional comments relating to NIFI-891 in that ticket.
> Create Annotation that indicates that a Processor cannot be scheduled to run
> without an incoming connection
> -----------------------------------------------------------------------------------------------------------
>
> Key: NIFI-810
> URL: https://issues.apache.org/jira/browse/NIFI-810
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Extensions
> Reporter: Mark Payne
>
> Currently, if a Processor has no incoming connections but is started, it will
> continually without ever accomplishing anything. We should have an
> annotation, perhaps @RequiresInput, that indicates that the Processor should
> not be scheduled to run unless it has an incoming connection.
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