jiajunwang opened a new pull request #639: Refine the WAGED rebalancer to minimize the partial rebalance workload. URL: https://github.com/apache/helix/pull/639 ### Issues - [x] My PR addresses the following Helix issues and references them in the PR description: #563 ### Description - [x] Here are some details about my PR, including screenshots of any UI changes: Prerequisite of #632 Split the cluster module calculation method so that different rebalance logic can have different rebalance scope calculation logic. Also, refine the WAGED rebalancer logic to reduce duplicate code. This PR depends on https://github.com/apache/helix/pull/635 ### Tests - [ ] The following tests are written for this issue: TestWagedRebalancer TestClusterModelProvider.java - [ ] The following is the result of the "mvn test" command on the appropriate module: Please refer to #632 's test result. ### Commits - [x] 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 - [x] In case of new functionality, my PR adds documentation in the following wiki page: NA ### Code Quality - [x] My diff has been formatted using helix-style.xml
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