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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