[GitHub] [helix] jiajunwang opened a new pull request #413: Add cluster level default instance config.

[GitBox <gi...@apache.org>]

jiajunwang opened a new pull request #413: Add cluster level default instance config.
URL: https://github.com/apache/helix/pull/413
 
 
   ### Issues
   
   - [ ] My PR addresses the following Helix issues and references them in the PR title:
   
   #412
   
   ### Description
   
   - [ ] Here are some details about my PR, including screenshots of any UI changes:
   
   Add cluster level default instance config.
   This config will be applied to the instance when there is no (or empty) capacity configuration in the Instance Config.
   Also add unit tests.
   
   ### Tests
   
   - [ ] The following tests are written for this issue:
   
   TestAssignableNode
   TestClusterModel
   
   - [ ] The following is the result of the "mvn test" command on the appropriate module:
   
   NA since the WAGED rebalancer has not been integrated yet.
   
   ### 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:
   
   https://github.com/apache/helix/wiki/Weight-aware-Globally-Evenly-distributed-Rebalancer
   
   ### Code Quality
   
   - [ ] My diff has been formatted using helix-style.xml

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