zhangmeng916 opened a new pull request #695: Modify participant manager to add 
cluster auto registration logic
URL: https://github.com/apache/helix/pull/695
 
 
   ### Issues
   
   - [X] My PR addresses the following Helix issues and references them in the 
PR description:
   
   (#694 )
   
   ### Description
   
   - [X] Here are some details about my PR, including screenshots of any UI 
changes:
   
   Helix is adding a new feature in which a participant may auto register 
itself to the cluster after connects. Different from current auto join 
function, auto registration will not only set up all the config information for 
the instance, but also retrieve the fault domain information for the 
participant, and register all this information to the cluster. This PR changes 
the logic in ParticipantManager by adding the auto registration logic. Two 
flags are used to denote auto join and auto registration. AutoJoin flag must be 
true if we would like to allow autoRegstration. 
   
   ### Tests
   
   - [X] The following is the result of the "mvn test" command on the 
appropriate module:
   
   
   ### 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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