pkuwm opened a new issue #779: Implement FederatedZkClient to Support Multi-Realm CRUD and Callback URL: https://github.com/apache/helix/issues/779 FederatedZkClient (One FederatedZkClient, multiple Zookeeper sessions inside) - Some Helix Java APIs such as HelixAdmin can only perform CRUD operations. - In order to enable such Java APIs to operate against multiple Zookeeper realms, we will create FederatedZkClient, which is a new version of ZkClient that could replace the existing HelixZkClient used by CRUD-only Java APIs. - FederatedZkClient will internally maintain multiple ZooKeeper sessions connecting to different ZooKeeper realms on an as-needed basis. - By creating and maintaining multiple ZooKeeper sessions, FederatedZkClient will route incoming ZooKeeper requests to the appropriate ZooKeeper sessions based on the ZK path sharding key. FederatedZkClient (implements RealmAwareZkClient) - An implementation of RealmAwareZkClient that connects to multiple ZK realms. - Supports CRUD + change subscription.
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