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https://issues.apache.org/jira/browse/NIFI-4280?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mark Payne resolved NIFI-4280.
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Resolution: Fixed
> UI - Support configuring variables at a Process Group level
> -----------------------------------------------------------
>
> Key: NIFI-4280
> URL: https://issues.apache.org/jira/browse/NIFI-4280
> Project: Apache NiFi
> Issue Type: New Feature
> Components: Core UI
> Reporter: Matt Gilman
> Assignee: Matt Gilman
> Fix For: 1.4.0
>
>
> Add support for configuring variables at a Process Group level. Variables,
> like Controller Services, are scoped by the group they are defined in and are
> available to any Processor defined there and below (ie and descendant
> Processors). Variables in a descendant group can override the value in a
> parent group. Variable permissions will be based solely on the corresponding
> Process Group.
> Because variables are specified in EL, there is no controlling access to them
> like Controller Services which can be restricted using the combo selector.
> Because of this, variables should not be used for sensitive values.
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