Simon Bence created NIFI-13030:
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             Summary: Provide endpoint for comparing different versions of 
registered flows
                 Key: NIFI-13030
                 URL: https://issues.apache.org/jira/browse/NIFI-13030
             Project: Apache NiFi
          Issue Type: New Feature
          Components: Core Framework
            Reporter: Simon Bence
            Assignee: Simon Bence


A new API endpoind will be added which expects a bucket and a flow id with two 
existing  (and different) version identifier. When the call is successfull, the 
response contains a list of changed components with the differences similar to 
the result used by Show Local Changes.

+Notes:+
- Having the same version for both sides of the comparison will result an empty 
list
- Non-existing bucket or flow ids will result error response.
- Compared to the "show local changes" we need to prepare for bigger data sets. 
As the main purpose of this future is to compare relatively close versions when 
updating the flow, we can consider longer results as "non useful". Because of 
this, the results might be limited to a size, just like in case of Provenance 
Event listing
- This initial effort only focuses on providing the endpoint.



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