frankmu commented on code in PR #2846:
URL: https://github.com/apache/helix/pull/2846#discussion_r1690582066


##########
helix-core/src/main/java/org/apache/helix/controller/rebalancer/condition/RebalanceConditionBuilder.java:
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@@ -0,0 +1,49 @@
+package org.apache.helix.controller.rebalancer.condition;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.function.BooleanSupplier;
+
+public class RebalanceConditionBuilder {

Review Comment:
   Sure, can you share some code pointers on how to detect the config change or 
topology change?
   e.g. for config change, is it something like the following:
   ```
   event.getEventType() ==  ClusterEventType.ClusterConfigChange
   ```



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