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https://issues.apache.org/jira/browse/NIFI-6879?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marcio Sugar closed NIFI-6879.
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Thank you!

> Variable Update Error when trying to change outside variable used inside a 
> Process Group
> ----------------------------------------------------------------------------------------
>
>                 Key: NIFI-6879
>                 URL: https://issues.apache.org/jira/browse/NIFI-6879
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Core Framework
>    Affects Versions: 1.10.0
>         Environment: Host OS: Ubuntu 16.04
> Docker version 19.03.4, build 9013bf583a
> Docker Image: apache/nifi 1.10.0 4310dad3312f
>            Reporter: Marcio Sugar
>            Assignee: Mark Payne
>            Priority: Major
>             Fix For: 1.11.0
>
>         Attachments: 1_Variable_Update_Error.png, 2_Variables.png, 
> nifi-app.log
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> This works fine in NiFi 1.7.1 but fails in NiFi 1.10.1.
> Whenever I try to change the value of a variable that's defined outside a 
> Process Group where it's used, NiFi fails during the Applying Updates with 
> the following message (image also attached):
> {noformat}
> Variable Update Error
> Unable to complete variable update request: Failed to update Variable 
> Registry because failed while performing step: Applying updates to Variable 
> Registry.{noformat}
> To reproduce the problem:
>  # On the top-level canvas, create a variable named "myvar", and set it to 
> "{{blah}}".
>  # Create a Process Group named "mypg".  Enter the group. 
>  # Inside "mypg", add a GenerateFlowFile and set its "Run Schedule" to "1 
> day" to get just one flow file when it's started.
>  # Still inside "mypg", add a LogMessage. Set its "Log prefix" to "{{MYLOG:}} 
> " and its "Log message" to "{{My message is: '${myvar}'.}}"
>  # Start both processors and see a message like this appeared in the 
> application's log:  {{MYLOG: My message is: 'blah'.}}
>  # Now leave the "mypg" Process Group and go back to the top-level canvas. 
> Try to set the "myvar" variable to a different value, like "{{blah-blah}}", 
> and hit "Apply". NiFi starts the steps to make the change, but fails during 
> the "Applying Updates" step with the above error message. In the log, the 
> following error message appears:
> {noformat}
> ERROR [Variable Registry Update Thread] o.a.nifi.web.api.ProcessGroupResource 
> Failed to update variable registry for Process Group with ID 
> 7f16c8da-016e-1000-aeb0-e65ea5e5f889
> java.lang.IllegalStateException: Cannot update variable 'myvar' because it is 
> referenced by 1 components that are currently running. {noformat}
> Images and log file attached. The log file has the full exception trace.
>  



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