hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/TestClusterNodeTracker.java

/**
 * 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 "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.
 */
package org.apache.hadoop.yarn.server.resourcemanager.scheduler;

import org.apache.hadoop.yarn.api.records.Resource;
import org.apache.hadoop.yarn.api.records.ResourceRequest;
import org.apache.hadoop.yarn.server.resourcemanager.MockNodes;
import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNode;
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSSchedulerNode;
import org.junit.Before;
import org.junit.Test;

import java.util.List;

import static org.junit.Assert.assertEquals;

/**
 * Test class to verify ClusterNodeTracker. Using FSSchedulerNode without
 * loss of generality.
 */
public class TestClusterNodeTracker {
  private ClusterNodeTracker<FSSchedulerNode> nodeTracker =
      new ClusterNodeTracker<>();

  @Before
  public void setup() {
    List<RMNode> rmNodes =
        MockNodes.newNodes(2, 4, Resource.newInstance(4096, 4));
    for (RMNode rmNode : rmNodes) {
      nodeTracker.addNode(new FSSchedulerNode(rmNode, false));
    }
  }

  @Test
  public void testGetNodeCount() {
    assertEquals("Incorrect number of nodes in the cluster",
        8, nodeTracker.nodeCount());

    assertEquals("Incorrect number of nodes in each rack",
        4, nodeTracker.nodeCount("rack0"));
  }

  @Test
  public void testGetNodesForResourceName() throws Exception {
    assertEquals("Incorrect number of nodes matching ANY",
        8, nodeTracker.getNodesByResourceName(ResourceRequest.ANY).size());

    assertEquals("Incorrect number of nodes matching rack",
        4, nodeTracker.getNodesByResourceName("rack0").size());

    assertEquals("Incorrect number of nodes matching node",
        1, nodeTracker.getNodesByResourceName("host0").size());
  }
}