[jira] [Created] (NIFI-14921) Decouple ZooKeeper to Separate NAR

["David Handermann (Jira)" <ji...@apache.org>]

David Handermann created NIFI-14921:
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             Summary: Decouple ZooKeeper to Separate NAR
                 Key: NIFI-14921
                 URL: https://issues.apache.org/jira/browse/NIFI-14921
             Project: Apache NiFi
          Issue Type: Improvement
          Components: Core Framework
            Reporter: David Handermann
            Assignee: David Handermann


NiFi 2 introduced the Leader Election Manager interface as a framework extension, with direct support for either Apache ZooKeeper or Kubernetes to implement clustering. The project packages the Kubernetes Leader Election Manager and State Provider in a separate NAR, and the ZooKeeper implementation should follow the same approach.

Historical support for an embedded ZooKeeper server involves more direct linkage to ZooKeeper components. The embedded ZooKeeper server component can be extracted and wrapped in a State Provider implementation to enable decoupled NAR packaging. This decoupling strategy can avoid any breaking changes to existing deployments, retaining support for current application properties.

Future work could consider alternative methods for decoupling embedded clustering, or a native clustering solution with minimal external dependencies.



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