[jira] [Created] (NIFI-764) Add support for global variables

["Matt Gilman (JIRA)" <ji...@apache.org>]

Matt Gilman created NIFI-764:
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             Summary: Add support for global variables
                 Key: NIFI-764
                 URL: https://issues.apache.org/jira/browse/NIFI-764
             Project: Apache NiFi
          Issue Type: Improvement
          Components: Core Framework, Core UI
            Reporter: Matt Gilman
            Priority: Minor
             Fix For: 0.3.0


Add support for global variables (possibly scoped at a group level). These could be used within NiFi expression language providing support for more portable templates and bulk configuration changes.

The general idea is that the user will be able to define a variable name and value and then use it within expression language. At this point they would be able to export a template with components referencing the variables. When imported into another NiFi instance with the same variables defined, it provides an easy way to move a flow between different environment and update it's configuration in a single action (like when values for development and production differ per instance).

Another benefit of an approach like this, it that it could allow for bunk edits. If multiple components reference the same variable (e.g. xxxx.post.uri), it allows the user to make that change in a single location rather than having to identify each instance of that value. Will obviously need to consider the mechanics when modifying a variable as it will require all referencing components to be stopped.
 



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