himanshukandwal commented on code in PR #2650:
URL: https://github.com/apache/helix/pull/2650#discussion_r1353076213


##########
helix-core/src/main/java/org/apache/helix/controller/rebalancer/waged/constraints/ConstraintBasedAlgorithm.java:
##########
@@ -100,7 +100,7 @@ public OptimalAssignment calculate(ClusterModel 
clusterModel) throws HelixRebala
           getNodeWithHighestPoints(replica, nodes, clusterModel.getContext(), 
busyInstances,
               optimalAssignment);
       // stop immediately if any replica cannot find best assignable node
-      if (maybeBestNode.isEmpty() || optimalAssignment.hasAnyFailure()) {
+      if (!maybeBestNode.isPresent() || optimalAssignment.hasAnyFailure()) {

Review Comment:
   Actually `isEmpty()` has been added in JDK 11. 
   https://bugs.openjdk.org/browse/JDK-8184693 
   
   We get compilation failure, with Java 9.
   ```
   [ERROR] 
/Users/hkandwal/Documents/workspaces/projects/helix_os_hk/helix-core/src/main/java/org/apache/helix/controller/rebalancer/waged/constraints/ConstraintBasedAlgorithm.java:[103,24]
 cannot find symbol
   [ERROR]   symbol:   method isEmpty()
   ```



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