[GitHub] [helix] desaikomal commented on a diff in pull request #2543: Add another test case for n-n+1 failure

["desaikomal (via GitHub)" <gi...@apache.org>]

desaikomal commented on code in PR #2543:
URL: https://github.com/apache/helix/pull/2543#discussion_r1240865354


##########
helix-core/src/test/java/org/apache/helix/integration/rebalancer/WagedRebalancer/TestWagedClusterExpansion.java:
##########
@@ -0,0 +1,362 @@
+package org.apache.helix.integration.rebalancer.WagedRebalancer;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional warnrmation
+ * 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
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * 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.Date;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import com.google.common.collect.ImmutableMap;
+import org.apache.helix.HelixDataAccessor;
+import org.apache.helix.NotificationContext;
+import org.apache.helix.common.ZkTestBase;
+import org.apache.helix.controller.rebalancer.waged.AssignmentMetadataStore;
+import org.apache.helix.integration.manager.ClusterControllerManager;
+import org.apache.helix.integration.manager.MockParticipantManager;
+import org.apache.helix.manager.zk.ZKHelixDataAccessor;
+import org.apache.helix.manager.zk.ZkBucketDataAccessor;
+import org.apache.helix.model.BuiltInStateModelDefinitions;
+import org.apache.helix.model.ClusterConfig;
+import org.apache.helix.model.CurrentState;
+import org.apache.helix.model.IdealState;
+import org.apache.helix.model.LiveInstance;
+import org.apache.helix.model.Message;
+import org.apache.helix.model.ResourceAssignment;
+import org.apache.helix.model.ResourceConfig;
+import org.apache.helix.participant.StateMachineEngine;
+import org.apache.helix.participant.statemachine.StateModel;
+import org.apache.helix.participant.statemachine.StateModelFactory;
+import org.apache.helix.participant.statemachine.StateModelInfo;
+import org.apache.helix.participant.statemachine.Transition;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.testng.annotations.AfterClass;
+import org.testng.annotations.BeforeClass;
+import org.testng.annotations.Test;
+
+/**
+ * This test case is specially targeting for n - n+1 issue.
+ * Waged is constraint-based algorithm. The end-state of calculated ideal-state will
+ * always satisfy hard-constraint.
+ * The issue is in order to reach the ideal-state, we need to do intermediate
+ * state-transitions.
+ * During this phase, hard-constraints are not satisfied.
+ * This test case is trying to mimic this by having a very tightly constraint
+ * cluster and increasing the weight for some resource and checking if
+ * intermediate state satisfies the need or not.
+ */
+public class TestWagedClusterExpansion extends ZkTestBase {

Review Comment:
   I am planning to get rid of TestWagedHardContraint in favor of this class. 



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