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https://issues.apache.org/jira/browse/NIFI-16493?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Handermann resolved NIFI-16493.
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Fix Version/s: nifi-api-2.14.0
Resolution: Fixed
> Partial Component State Updates
> -------------------------------
>
> Key: NIFI-16493
> URL: https://issues.apache.org/jira/browse/NIFI-16493
> Project: Apache NiFi
> Issue Type: Improvement
> Components: NiFi API
> Reporter: Mark Payne
> Assignee: Mark Payne
> Priority: Major
> Fix For: nifi-api-2.14.0
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> Add a {{patchState(Map<String, String> updatedState, Scope scope)}} method to
> {{StateManager}} and {{ProcessSession}} so that a component can change some
> of its state keys without replacing the whole state map.
> A key with a non-null value is created or overwritten, a key with a {{null}}
> value is removed, and keys that are not in the map are left as they are. An
> empty map does nothing, and a {{null}} map is not allowed.
> {{StateManager.patchState}} has a default implementation that retrieves the
> state, applies the changes, and calls {{replace}} until it succeeds.
> {{ProcessSession.patchState}} has no default, so that each session
> implementation must pass the patch through to the framework rather than
> turning it into a whole-map write. Any {{ProcessSession}} implementation
> outside of NiFi must add the method.
> This implements NIP-50.
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