/*
 * 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;

import java.io.File;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.yarn.api.records.NodeId;
import org.apache.hadoop.yarn.api.records.NodeLabel;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

import org.apache.hadoop.thirdparty.com.google.common.collect.ImmutableSet;

public class TestRMHAForNodeLabels extends RMHATestBase {
  public static final Logger LOG = LoggerFactory
      .getLogger(TestRMHAForNodeLabels.class);

  @Before
  @Override
  public void setup() throws Exception {
    super.setup();
    
    // Create directory for node label store 
    File tempDir = File.createTempFile("nlb", ".tmp");
    tempDir.delete();
    tempDir.mkdirs();
    tempDir.deleteOnExit();
    
    confForRM1.setBoolean(YarnConfiguration.NODE_LABELS_ENABLED, true);
    confForRM1.set(YarnConfiguration.FS_NODE_LABELS_STORE_ROOT_DIR,
        tempDir.getAbsolutePath());
    
    confForRM2.setBoolean(YarnConfiguration.NODE_LABELS_ENABLED, true);
    confForRM2.set(YarnConfiguration.FS_NODE_LABELS_STORE_ROOT_DIR,
        tempDir.getAbsolutePath());
  }
  
  @Test
  public void testRMHARecoverNodeLabels() throws Exception {
    // start two RMs, and transit rm1 to active, rm2 to standby
    startRMs();
    
    // Add labels to rm1
    rm1.getRMContext()
        .getNodeLabelManager()
        .addToCluserNodeLabels(
            Arrays.asList(NodeLabel.newInstance("a"),
                NodeLabel.newInstance("b"), NodeLabel.newInstance("c")));
   
    Map<NodeId, Set<String>> nodeToLabels = new HashMap<>();
    nodeToLabels.put(NodeId.newInstance("host1", 0), ImmutableSet.of("a"));
    nodeToLabels.put(NodeId.newInstance("host2", 0), ImmutableSet.of("b"));
    
    rm1.getRMContext().getNodeLabelManager().replaceLabelsOnNode(nodeToLabels);

    // Do the failover
    explicitFailover();

    // Check labels in rm2
    Assert
        .assertTrue(rm2.getRMContext().getNodeLabelManager()
            .getClusterNodeLabelNames()
            .containsAll(ImmutableSet.of("a", "b", "c")));
    Assert.assertTrue(rm2.getRMContext().getNodeLabelManager()
        .getNodeLabels().get(NodeId.newInstance("host1", 0)).contains("a"));
    Assert.assertTrue(rm2.getRMContext().getNodeLabelManager()
        .getNodeLabels().get(NodeId.newInstance("host2", 0)).contains("b"));
  }
}