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https://issues.apache.org/jira/browse/NIFI-6879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17015903#comment-17015903
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Davide Sessi commented on NIFI-6879:
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This issue is pretty annoying.
The only workaround I've found out is to create a template, download it, edit
the xml, updload it again and re-instanziate it.
Do you know a simpler workaround?
Also, since it's already fixed, any chance to get a release 1.10.1 soon with
this fix instead of waiting for 1.11.0?
> 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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