jiajunwang commented on a change in pull request #381: Implement the POC work 
greedy constraint based algorithm
URL: https://github.com/apache/helix/pull/381#discussion_r314508031

 File path: 
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+package org.apache.helix.controller.rebalancer.waged.model;
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import org.apache.helix.controller.rebalancer.waged.constraints.HardConstraint;
+import org.apache.helix.model.ResourceAssignment;
+import javafx.util.Pair;
+ * The data model represents the optimal assignment of N replicas assigned to 
M instances;
+ * It's mostly used as the return parameter of an assignment calculation 
algorithm; If the algorithm
+ * failed to find
+ * optimal assignment given the endeavor, the user could check the failure 
+ */
+public class OptimalAssignment {
+  private Map<AssignableNode, List<AssignableReplica>> _optimalAssignment = 
new HashMap<>();
+  private Map<Pair<AssignableNode, AssignableReplica>, List<HardConstraint>> 
_failedAssignments = new HashMap<>();
+  private ClusterContext _clusterContext;
 Review comment:
   As mentioned above, why not using ClusterModel here?
   Or, if you prefer this style, another option would be splitting 
ClusterModel. Meaning you make the current ClusterModel readonly. And move the 
assign/release methods to OptimalAssignment.
   I'm fine with either solution.

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