[jira] [Commented] (NIFI-5464) Local Ports are able to be started without incoming connections, then use a lot of CPU

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    [ https://issues.apache.org/jira/browse/NIFI-5464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16813478#comment-16813478 ] 

ASF subversion and git services commented on NIFI-5464:
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Commit 38db4e97cd619b3a3c46e2e6a2e71e25df98ad0b in nifi's branch refs/heads/master from Mark Payne
[ https://gitbox.apache.org/repos/asf?p=nifi.git;h=38db4e9 ]

NIFI-5464: Consider ports invalid unless they have both incoming and outgoing connections

This closes #3417.

Signed-off-by: Bryan Bende <bb...@apache.org>


> Local Ports are able to be started without incoming connections, then use a lot of CPU
> --------------------------------------------------------------------------------------
>
>                 Key: NIFI-5464
>                 URL: https://issues.apache.org/jira/browse/NIFI-5464
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Core Framework
>            Reporter: Mark Payne
>            Assignee: Mark Payne
>            Priority: Major
>             Fix For: 1.10.0
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> Currently, validation of a LocalPort simply checks that it has an outgoing connection. This means that it's possible to create an outgoing connection for a port but not have any incoming connections. When this happens, if the Port is started, the framework determines that it is a "source component" because it has no incoming connections. As such, it is never yielded via the "bored yield duration". This results in high CPU usage.
> The fix in this case, I believe, is to address the validation. We should not allow a Local Port to be enabled if it has no incoming connections.



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