[jira] [Commented] (NIFI-6879) Variable Update Error when trying to change outside variable used inside a Process Group

["Davide Sessi (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/NIFI-6879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17015903#comment-17015903 ] 

Davide Sessi commented on NIFI-6879:
------------------------------------

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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