narendly opened a new pull request #908: Make Helix REST realm-aware
URL: https://github.com/apache/helix/pull/908
 
 
   ### Issues
   
   - [x] My PR addresses the following Helix issues and references them in the 
PR description:
   
   Fixes #907 
   
   ### Description
   
   - [x] Here are some details about my PR, including screenshots of any UI 
changes:
   
   Helix REST needs to start using a realm-aware ZkClient on multi-zk mode. 
Also it needs to become a listener on routing data because we don't want to 
restart the HelixRestServer every time we update the routing data.
   
   Changelist:
   1. Make ServerContext listen on routing data paths if run on multi-zk mode
   2. Make HelixRestServer use RealmAwareZkClient (FederatedZkClient) on 
multi-zk mode
   
   ### Tests
   
   - [x] The following tests are written for this issue:
   
   TestRoutingDataUpdate
   
   - [x] The following is the result of the "mvn test" command on the 
appropriate module:
   
   on helix-rest module:
   
   > [INFO] Results:
   > [INFO] 
   > [ERROR] Failures: 
   > [ERROR]   TestResourceAccessor.testResourceHealth:289 expected:<HEALTHY> 
but was:<UNHEALTHY>
   > [INFO] 
   > [ERROR] Tests run: 144, Failures: 1, Errors: 0, Skipped: 7
   > [INFO] 
   > [INFO] 
------------------------------------------------------------------------
   > [INFO] BUILD FAILURE
   > [INFO] 
------------------------------------------------------------------------
   > [INFO] Total time:  37.847 s
   > [INFO] Finished at: 2020-03-23T22:02:47-07:00
   > [INFO] 
------------------------------------------------------------------------
   
   TestResourceAccessor is an unrelated failure that will be fixed in future 
iterations.
   
   ### Commits
   
   - [x] My commits all reference appropriate Apache Helix GitHub issues in 
their subject lines. 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 
   (helix-style-intellij.xml if IntelliJ IDE is used)
   
   

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