pkuwm opened a new pull request #789: [WIP] Add FederatedZkClient URL: https://github.com/apache/helix/pull/789 ### Issues - [ ] My PR addresses the following Helix issues and references them in the PR description: Implements #779 ### Description - [ ] Here are some details about my PR, including screenshots of any UI changes: 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. ### Tests - [ ] The following tests are written for this issue: (List the names of added unit/integration tests) - [ ] The following is the result of the "mvn test" command on the appropriate module: (Copy & paste the result of "mvn test") ### Commits - [ ] My commits all reference appropriate Apache Helix GitHub issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)": 1. Subject is separated from body by a blank line 1. Subject is limited to 50 characters (not including Jira issue reference) 1. Subject does not end with a period 1. Subject uses the imperative mood ("add", not "adding") 1. Body wraps at 72 characters 1. Body explains "what" and "why", not "how" ### Documentation - [ ] In case of new functionality, my PR adds documentation in the following wiki page: (Link the GitHub wiki you added) ### Code Quality - [ ] My diff has been formatted using helix-style.xml
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