exceptionfactory opened a new pull request, #7235: URL: https://github.com/apache/nifi/pull/7235
# Summary [NIFI-10976](https://issues.apache.org/jira/browse/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 `StateProvider` interface 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 Please complete the following tracking steps prior to pull request creation. ### Issue Tracking - [X] [Apache NiFi Jira](https://issues.apache.org/jira/browse/NIFI) issue created ### Pull Request Tracking - [X] Pull Request title starts with Apache NiFi Jira issue number, such as `NIFI-00000` - [X] Pull Request commit message starts with Apache NiFi Jira issue number, as such `NIFI-00000` ### Pull Request Formatting - [X] Pull Request based on current revision of the `main` branch - [X] Pull Request refers to a feature branch with one commit containing changes # Verification Please indicate the verification steps performed prior to pull request creation. ### Build - [X] Build completed using `mvn clean install -P contrib-check` - [X] JDK 11 - [ ] JDK 17 ### Licensing - [ ] New dependencies are compatible with the [Apache License 2.0](https://apache.org/licenses/LICENSE-2.0) according to the [License Policy](https://www.apache.org/legal/resolved.html) - [ ] New dependencies are documented in applicable `LICENSE` and `NOTICE` files ### Documentation - [ ] Documentation formatting appears as expected in rendered files -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
