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https://issues.apache.org/jira/browse/NIFI-810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14947666#comment-14947666
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ASF subversion and git services commented on NIFI-810:
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Commit 13edcfda2ef830e1b160b31f7cd3bea874ccd3f0 in nifi's branch 
refs/heads/NIFI-810-InputRequirement from [~mcgilman]
[ https://git-wip-us.apache.org/repos/asf?p=nifi.git;h=13edcfd ]

NIFI-810:
- Adding basic support for preventing connection when appropriate.
- Updating validation when [dis]connecting processors.


> 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
>            Assignee: 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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