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https://issues.apache.org/jira/browse/NIFI-11595?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Peter Turcsanyi updated NIFI-11595:
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Status: Patch Available (was: Open)
> StateProvider.replace() cannot create the initial state
> -------------------------------------------------------
>
> Key: NIFI-11595
> URL: https://issues.apache.org/jira/browse/NIFI-11595
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Reporter: Peter Turcsanyi
> Assignee: Peter Turcsanyi
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> {{StateProvider.replace()}} method properly works when the state already
> exists and persisted in the storage. However, it cannot create the state at
> first run.
> As a workaround, {{setState()}} needs to be used but it does not provide the
> same compare-and-swap mechanism as {{replace()}} so it is the caller
> responsibility to handle concurrency.
> To lift this responsibility from the clients and also to provide a more
> consistent API, {{replace()}} should support creating the initial state. It
> should be able to move the state "from nothing to X" not only "from X1 to X2"
> and also providing the same compare-and-swap logic.
> Affected {{StateProvider}} implementations:
> - {{ZooKeeperStateProvider}}
> - {{RedisStateProvider}}
> - {{KubernetesConfigMapStateProvider}}
> - {{WriteAheadLocalStateProvider}}
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