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From "Mark Bean (Jira)" <>
Subject [jira] [Created] (NIFI-7231) NiFi fails to start due to blocking controller service validation
Date Fri, 06 Mar 2020 13:29:00 GMT
Mark Bean created NIFI-7231:

             Summary: NiFi fails to start due to blocking controller service validation
                 Key: NIFI-7231
             Project: Apache NiFi
          Issue Type: Bug
          Components: Core Framework
    Affects Versions: 1.10.0
            Reporter: Mark Bean
            Assignee: Mark Bean

NiFi will not enable all controller services during startup when there are additional referenced
controller services within a controller service. Specifically, this was observed when the
referenced controller services were dynamic properties. 
The enabling process correctly enables referenced services first. However, during the enabling
process, all referencing components are validated. This creates a situation where the parent
controller service is repeatedly validated for every child controller service. And, part of
the validation of the parent is to validate the child. The circular validation will eventually
block; controller services are not properly enabled; NiFi does not complete the startup process.
The fix is to not validate the parent controller services unless or until all child controller
services are enabled. Any child service which is not enabled (regardless of validation) will
cause the parent to be invalid. Repeated validation is not required.

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