content: /*
   * 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.ambari.server.checks;
  
  import java.util.Collection;
  
  import org.apache.ambari.annotations.UpgradeCheckInfo;
  import org.apache.ambari.server.AmbariException;
  import org.apache.ambari.server.state.Cluster;
  import org.apache.ambari.server.state.Host;
  import org.apache.ambari.server.state.HostHealthStatus.HealthStatus;
  import org.apache.ambari.server.state.MaintenanceState;
  import org.apache.ambari.spi.upgrade.UpgradeCheckDescription;
  import org.apache.ambari.spi.upgrade.UpgradeCheckGroup;
  import org.apache.ambari.spi.upgrade.UpgradeCheckRequest;
  import org.apache.ambari.spi.upgrade.UpgradeCheckResult;
  import org.apache.ambari.spi.upgrade.UpgradeCheckStatus;
  import org.apache.ambari.spi.upgrade.UpgradeCheckType;
  import org.apache.ambari.spi.upgrade.UpgradeType;
  
  import com.google.common.collect.ImmutableMap;
  import com.google.inject.Singleton;
  
  /**
   * Checks that all hosts are heartbeating with the Ambari Server. If there is a
   * host which is not heartbeating, then it must be in maintenance mode to
   * prevent a failure of this check.
   * <p/>
   * This check will return {@link UpgradeCheckStatus#FAIL} if there are hosts not
   * heartbeating and not in maintenance mode.
   *
   * @see HostMaintenanceModeCheck
   */
  @Singleton
  @UpgradeCheckInfo(
      group = UpgradeCheckGroup.LIVELINESS,
      order = 1.0f,
      required = { UpgradeType.ROLLING, UpgradeType.NON_ROLLING, UpgradeType.HOST_ORDERED })
  public class HostsHeartbeatCheck extends ClusterCheck {
  
    static final UpgradeCheckDescription HOSTS_HEARTBEAT = new UpgradeCheckDescription("HOSTS_HEARTBEAT",
        UpgradeCheckType.HOST,
        "All hosts must be communicating with Ambari. Hosts which are not reachable should be placed in Maintenance Mode.",
        new ImmutableMap.Builder<String, String>()
          .put(UpgradeCheckDescription.DEFAULT,
              "There are hosts which are not communicating with Ambari.").build());
  
    /**
     * Constructor.
     */
    public HostsHeartbeatCheck() {
      super(HOSTS_HEARTBEAT);
    }
  
    /**
     * {@inheritDoc}
     */
    @Override
    public UpgradeCheckResult perform(UpgradeCheckRequest request)
        throws AmbariException {
      UpgradeCheckResult result = new UpgradeCheckResult(this);
  
      final String clusterName = request.getClusterName();
      final Cluster cluster = clustersProvider.get().getCluster(clusterName);
      Collection<Host> hosts = cluster.getHosts();
  
      for (Host host : hosts) {
        HealthStatus hostHealth = host.getHealthStatus().getHealthStatus();
        MaintenanceState maintenanceState = host.getMaintenanceState(cluster.getClusterId());
        switch (hostHealth) {
          case UNHEALTHY:
          case UNKNOWN:
            if (maintenanceState == MaintenanceState.OFF) {
              result.getFailedOn().add(host.getHostName());
  
              result.getFailedDetail().add(
                  new HostDetail(host.getHostId(), host.getHostName()));
            }
            break;
          default:
            break;
  
        }
      }
  
      // for any hosts unhealthy and NOT in MM mode, fail this check
      if (!result.getFailedOn().isEmpty()) {
        result.setStatus(UpgradeCheckStatus.FAIL);
        result.setFailReason(getFailReason(result, request));
      }
  
      return result;
    }
  }
  