Art DeCarlo created NIFI-8012:
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Summary: ControllerServiceDefintions getting lost on dynamic
properties referencing services
Key: NIFI-8012
URL: https://issues.apache.org/jira/browse/NIFI-8012
Project: Apache NiFi
Issue Type: Bug
Components: Core Framework
Affects Versions: 1.12.1
Reporter: Art DeCarlo
When changing processor versions, controllerServiceDefintions can be
intermittently lost for dynamic control service properties because of the
random order that properties are looped through and set in
AbstractComponentNode.refreshProperties().
On a custom processor, where a static property value influences the
PropertyDescriptor definitions of dynamic properties, the processor needs to
set the values of the static properties before
getSupportedDynamicPropertyDescriptor() is called.
In my specific case, I have a custom processor similar to JoltTransformJSON,
where the user-provided specification can trigger creation of multiple
RecordLookupService or StringLookupService dynamic properties.
This works well, except when doing an upgrade and changing the processor
version. Because of the issue outlined above, the service definitions can be
lost for the dynamic service properties. Once lost, when viewing the
configuration of the processor, the values of the dynamic service definitions
simply appear as the GUID identifiers of those services, and the Controller
Services Settings tab no longer shows the processor as being a Referencing
Component.
Similarly, the loop in AbstractComponentNode.setProperties() should be updated
to loop through the non-dynamic properties first, followed by the dynamic
properties.
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