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https://issues.apache.org/jira/browse/NIFI-16494?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mark Payne resolved NIFI-16494.
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Fix Version/s: 2.13.0
Resolution: Fixed
> Implement Partial Component State Updates in Framework
> ------------------------------------------------------
>
> Key: NIFI-16494
> URL: https://issues.apache.org/jira/browse/NIFI-16494
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Core Framework
> Reporter: Mark Payne
> Assignee: Mark Payne
> Priority: Major
> Fix For: 2.13.0
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> Implement the {{patchState}} methods added to {{StateManager}} and
> {{ProcessSession}} in the NiFi API, so that a patch reaches the State
> Provider as a patch instead of as a whole state map.
> {{StandardProcessSession}} should hold patches separately from whole-map
> updates and, on commit, send only the patched keys to the State Manager.
> Because a patch changes only its own keys, it is applied on commit even if
> the stored state changed after the session read it. Each State Manager and
> session wrapper must pass the call through, and {{StateProvider}} should gain
> a {{patchState}} method with a default implementation.
> {{WriteAheadLocalStateProvider}} should write only the patched keys to its
> journal, which avoids writing a large map on every small change. This
> requires a new journal format version, so a journal written by this version
> cannot be read by an older version of NiFi.
> This implements NIP-50.
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