zhangmeng916 opened a new pull request #729: Implement Helix API for updating 
customized state
URL: https://github.com/apache/helix/pull/729
 
 
   ### Issues
   
   - [X] My PR addresses the following Helix issues and references them in the 
PR description:
   
   (#728 )
   
   ### Description
   
   - [X] Here are some details about my PR, including screenshots of any UI 
changes:
   
   Currently, Helix only supports a single state for every partition. There're 
increasing requests from customers to have more than one state, which is 
defined in Helix state model, for their practical use. For example, they may 
want to have read/write state, quota state, version state, etc. Helix will 
introduce the concept of customized state, which allows customer to define the 
states they are interested. 
   This PR is to implement Helix API for customers to import their customized 
state. The customized state is adjacent to CURRENT_STATE as a separate znode. 
Under this znode, there are children znodes representing each individual 
customized state. And each customized state is categorized by resources.
   
   ### Tests
   
   - [X] The following tests are written for this issue:
   
   TestCustomizedStateUpdate.java
   
   - [X] The following is the result of the "mvn test" command on the 
appropriate module:
   
   (Copy & paste the result of "mvn test")
   
   ### 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"
   
   ### Code Quality
   
   - [X] My diff has been formatted using helix-style.xml

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