Ed Berezitsky created NIFI-5856:
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             Summary: Add capability to assign available matching controller 
services to processors during import from registry
                 Key: NIFI-5856
                 URL: https://issues.apache.org/jira/browse/NIFI-5856
             Project: Apache NiFi
          Issue Type: Improvement
          Components: Extensions
    Affects Versions: 1.8.0
            Reporter: Ed Berezitsky


As a user I would like to reduce manual configuration of components after 
importing flows from NIFI registry.

Use cases:
 * a component uses controller service(s) defined in a scope of *parent* (or 
higher) level (e.g. record-based processors, DB pools, etc) can have 
controllers assigned by default, if ID registered is not available (versioned 
from another NIFI instance)
 * a controller service that is in a scope of imported flow uses another 
controller in a scope  of *parent* (or higher) level (e.g. Record 
readers/writer using schema registry).

Current state:
 * a lookup for a controller service is done by ID. If ID is not found, a 
controller won't be assigned and property of a processor/controller will stay 
blank and will require manual configuration/selection

Specifications/Requirements:
 * Change current behavior to enable default assignment of controller services 
to processor/controller property in case desired controller service cannot be 
found by ID.
 * in order to reduce wrong automatic assignments, both type and name of a 
controller service should be considered. 
 * Since names aren't unique, have a NIFI property to specify strict and 
nonstrict policy for multi-match:
 ** strict mode will restrict automatic assignment of controller service, and 
property in the processor/controller will stay blank (as per current 
specification).
 ** nonstrict mode will allow any of matching controllers to be assigned (first 
found).

 



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