jiajunwang commented on a change in pull request #690: Reset the WAGED 
rebalancer once the controller newly acquires leadership.
URL: https://github.com/apache/helix/pull/690#discussion_r370336341
 
 

 ##########
 File path: 
helix-core/src/main/java/org/apache/helix/controller/GenericHelixController.java
 ##########
 @@ -187,6 +187,11 @@
 
   private HelixManager _helixManager;
 
+  // Since the WAGED rebalancer needs to be lazily constructed, the 
GenericHelixController will not
+  // be constructed with a WAGED rebalancer. This wrapper is to avoid the 
complexity of handling a
+  // nullable value in the GenericHelixController logic.
+  private final WagedRebalancerRef _wagedRebalancerRef = new 
WagedRebalancerRef();
 
 Review comment:
   I've tried to make the class more generic. Now it is an abstract class. But 
the configuration part seems to be overdesign for now. Let's consider that part 
once we have multiple ones.

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