Xinyu Wang created NIFI-15746:
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Summary: Inherited parameter contexts unconditionally overwritten
during versioned flow deployment with KEEP_EXISTING strategy
Key: NIFI-15746
URL: https://issues.apache.org/jira/browse/NIFI-15746
Project: Apache NiFi
Issue Type: Bug
Components: Flow Versioning
Affects Versions: 2.5.0
Reporter: Xinyu Wang
When deploying a versioned flow from NiFi Registry using
parameterContextHandlingStrategy=KEEP_EXISTING, if a parameter context with the
same name already exists on the target NiFi instance, its parameter values are
correctly preserved, but its inherited parameter context list is
unconditionally replaced with the one from the versioned flow snapshot.
This is problematic in multi-environment deployment scenarios (e.g., DEV →
PROD) where the same-named parameter context is intentionally configured with
different inheritance chains on each environment. The KEEP_EXISTING strategy
should preserve the existing parameter context as-is — including its
inheritance — but currently only preserves parameter values while silently
overwriting the inheritance chain.
The root cause is in
StandardVersionedComponentSynchronizer.addMissingConfiguration(), which calls
currentParameterContext.setInheritedParameterContexts(...) without checking
whether the current parameter context already has inherited context configured.
Steps to Reproduce:
1. Set up two NiFi instances (Instance A and Instance B), both connected to
the same NiFi Registry.
2. On Instance B (target), create the following parameter context hierarchy:
- target-system-params — a top-level parameter context with
environment-specific parameters
- shared-service-params — inheriting from target-system-params
3. On Instance A (source), create the following parameter context hierarchy:
- source-system-params — a top-level parameter context
- shared-service-params — inheriting from source-system-params
4. On Instance A, create a Process Group MyWorkflow containing a nested
Process Group MyService:
- MyWorkflow uses parameter context workflow-params
- MyService uses parameter context shared-service-params
5. Save MyWorkflow to NiFi Registry as Version 1.
6. Verify the state on Instance B before deployment:
- Confirm shared-service-params inherits from target-system-params.
7. On Instance B, deploy Version 1 from Registry:
POST
/process-groups/\{id}/process-groups?parameterContextHandlingStrategy=KEEP_EXISTING
8. Check shared-service-params on Instance B after deployment.
Expected Result:
shared-service-params on Instance B retains its existing inheritance from
target-system-params. The KEEP_EXISTING strategy should preserve the existing
parameter context entirely — both its parameters and its inheritance chain.
Actual Result:
shared-service-params on Instance B now inherits from source-system-params
(resolved by name on Instance B). The inheritance chain configured for the
target environment has been silently overwritten by the source environment's
definition.
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