NIFI-10976 Add Previous Cluster State Provider configuration#7235
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- Added methods to enumerate Stored Component Identifiers on State Provider interface and implementations - Added nifi.state.management.provider.cluster.previous to nifi.properties - Updated State Manager Provider to restore Cluster State from Previous Cluster Provider - Updated Configuring State Providers documentation for new property
bbende
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May 10, 2023
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Code looks good and was able to verify using this new property to migrate state from a previous ZK to a new ZK, and everything worked as described.
iadamcsik
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Oct 22, 2025
- CDPDFX-6285: Passing through flow designer id during component creation (apache#106) - CDPDFX-7171 Correcting resolution of VCI for scheduled state changes (apache#108) - CDPDFX-7192 Add lastModifier field to FlowChangeEvent, set lastModifier when publishing state change events (apache#109) - CDPDFX-6285 Use flow designer id in flow control event handler - NIFI-10976 Added Previous Cluster State Provider configuration (apache#7235) - Added methods to enumerate Stored Component Identifiers on State Provider interface and implementations - Added nifi.state.management.provider.cluster.previous to nifi.properties - Updated State Manager Provider to restore Cluster State from Previous Cluster Provider - Updated Configuring State Providers documentation for new property
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Summary
NIFI-10976 Adds a Previous Cluster State Provider to support migrating from one Cluster State Provider implementation to another.
The new Previous Cluster Provider property enables conditional transfer of Cluster State from a previous Cluster State Provider to the configured Cluster State Provider. This approaches supports migration scenarios such as moving from ZooKeeper to Kubernetes ConfigMaps or Redis. The implementation is a one-way operation that copies from the Previous Provider to the Current Provider when the Current Provider does not have any state information. After the initial state transfer, the framework ignores the Previous Provider when the Current Provider contains stored informaiton.
Changes include new methods on the
StateProviderinterface to support enumeration of stored Component Identifiers. The default interface methods indicate that enumeration is not supported, so State Provider implementations must implement both new methods to support transferring state from a previous provider.Tracking
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