[jira] [Created] (NIFI-8040) Failed to update Flow on all nodes in cluster due to Cannot modify Processor configuration while the Processor is running

["Vasily Gudoshnikov (Jira)" <ji...@apache.org>]

Vasily Gudoshnikov created NIFI-8040:
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             Summary: Failed to update Flow on all nodes in cluster due to Cannot modify Processor configuration while the Processor is running
                 Key: NIFI-8040
                 URL: https://issues.apache.org/jira/browse/NIFI-8040
             Project: Apache NiFi
          Issue Type: Bug
          Components: Core Framework
            Reporter: Vasily Gudoshnikov
         Attachments: ProcessorNode.patch, image-2020-11-24-15-57-26-995.png

Relates to NIFI-5227

Steps to reproduce:
 # Create a simple flow: *GenerateFlowFile + UpdateAttribute*. Ensure both processors have valid state.
 # Commit flow to a registry.
 # Remove connection between processors or do something else to move *UpdateAttribute* in invalid state.
 # Commit flow to a registry.
 # Change flow version to "1". *UpdateAttribute* should be valid now.
 # Run *UpdateAttribute* 
 # Change flow version to "2". Ensure *UpdateAttribute* has invalid state now.
 # Change flow version back to "1".

You will see error message _"Failed to update Flow on all nodes in cluster due to Cannot modify Processor configuration while the Processor is running"._

_!image-2020-11-24-15-57-26-995.png!_

Error message for single node (non cluster) will be similar.

See attached patch. My solution is quite simple but I don't sure may be it is not good enough.



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