jiajunwang opened a new pull request #514: The WAGED rebalancer returns the previously calculated assignment on calculation failure URL: https://github.com/apache/helix/pull/514 ### Issues - [ ] My PR addresses the following Helix issues and references them in the PR description: #507 ### Description - [ ] Here are some details about my PR, including screenshots of any UI changes: The WAGED rebalancer returns the previously calculated assignment on calculation failure This is to protect the cluster assignment on a rebalancing algorithm failure. For example, the cluster is out of capacity. In this case, the rebalancer will keep using the previously calculated mapping. Also, add the RebalanceFailureCount metric for recording the failures. ### Tests - [ ] The following tests are written for this issue: New test cases to TestWagedRebalancer - [ ] 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: NA ### Code Quality - [ ] My diff has been formatted using helix-style.xml
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