zhangmeng916 commented on a change in pull request #851: Modify Helix generic 
controller to include new stage for customized view aggregation
URL: https://github.com/apache/helix/pull/851#discussion_r396867483
 
 

 ##########
 File path: helix-core/src/main/java/org/apache/helix/PropertyKey.java
 ##########
 @@ -474,6 +474,15 @@ public PropertyKey currentState(String instanceName, 
String sessionId, String re
       }
     }
 
+    /**
+     * Get a property key associated with the root of {@link CustomizedState} 
of an instance
+     * @param instanceName
+     * @return {@link PropertyKey}
+     */
+    public PropertyKey customizedStatesRoot(String instanceName) {
 
 Review comment:
   This might cause more confusion as there're many places that have 
customizedStates as variable name. I fear it actually makes the later 
modification (combine two layers) more difficult. Have a "root" name here can 
help us know exactly where need to be changed. 

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