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.HashSet;
  import java.util.Map;
  import java.util.Set;
  
  import org.apache.ambari.annotations.UpgradeCheckInfo;
  import org.apache.ambari.server.AmbariException;
  import org.apache.ambari.server.stack.upgrade.UpgradePack;
  import org.apache.ambari.server.stack.upgrade.UpgradePack.ProcessingComponent;
  import org.apache.ambari.server.state.Cluster;
  import org.apache.ambari.server.state.Host;
  import org.apache.ambari.server.state.MaintenanceState;
  import org.apache.ambari.server.state.Service;
  import org.apache.ambari.server.state.ServiceComponent;
  import org.apache.ambari.server.state.StackId;
  import org.apache.ambari.spi.RepositoryVersion;
  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 in maintenance state do not have master components.
   */
  @Singleton
  @UpgradeCheckInfo(
      group = UpgradeCheckGroup.MAINTENANCE_MODE,
      order = 5.0f,
      required = { UpgradeType.ROLLING, UpgradeType.NON_ROLLING, UpgradeType.HOST_ORDERED })
  public class HostsMasterMaintenanceCheck extends ClusterCheck {
  
    static final String KEY_NO_UPGRADE_NAME = "no_upgrade_name";
    static final String KEY_NO_UPGRADE_PACK = "no_upgrade_pack";
  
    static final UpgradeCheckDescription HOSTS_MASTER_MAINTENANCE = new UpgradeCheckDescription("HOSTS_MASTER_MAINTENANCE",
        UpgradeCheckType.HOST,
        "Hosts in Maintenance Mode must not have any master components",
        new ImmutableMap.Builder<String, String>()
          .put(UpgradeCheckDescription.DEFAULT,
              "The following hosts must not be in in Maintenance Mode since they host Master components: {{fails}}.")
          .put(HostsMasterMaintenanceCheck.KEY_NO_UPGRADE_NAME,
              "Could not find suitable upgrade pack for %s %s to version {{version}}.")
          .put(HostsMasterMaintenanceCheck.KEY_NO_UPGRADE_PACK,
              "Could not find upgrade pack named %s.").build());
  
    /**
     * Constructor.
     */
    public HostsMasterMaintenanceCheck() {
      super(HOSTS_MASTER_MAINTENANCE);
    }
  
    @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);
      RepositoryVersion repositoryVersion = request.getTargetRepositoryVersion();
      final StackId stackId = new StackId(repositoryVersion.getStackId());
      final Set<String> hostsWithMasterComponent = new HashSet<>();
  
      final String upgradePackName = repositoryVersionHelper.get().getUpgradePackageName(
          stackId.getStackName(), stackId.getStackVersion(), repositoryVersion.getVersion(), null);
  
      if (upgradePackName == null) {
        result.setStatus(UpgradeCheckStatus.FAIL);
        String fail = getFailReason(KEY_NO_UPGRADE_NAME, result, request);
        result.setFailReason(String.format(fail, stackId.getStackName(), stackId.getStackVersion()));
        return result;
      }
  
      final UpgradePack upgradePack = ambariMetaInfo.get().getUpgradePacks(stackId.getStackName(), stackId.getStackVersion()).get(upgradePackName);
      if (upgradePack == null) {
        result.setStatus(UpgradeCheckStatus.FAIL);
        String fail = getFailReason(KEY_NO_UPGRADE_PACK, result, request);
        result.setFailReason(String.format(fail, upgradePackName));
        return result;
      }
  
      final Set<String> componentsFromUpgradePack = new HashSet<>();
      for (Map<String, ProcessingComponent> task: upgradePack.getTasks().values()) {
        componentsFromUpgradePack.addAll(task.keySet());
      }
  
      for (Service service: cluster.getServices().values()) {
        for (ServiceComponent serviceComponent: service.getServiceComponents().values()) {
          if (serviceComponent.isMasterComponent() && componentsFromUpgradePack.contains(serviceComponent.getName())) {
            hostsWithMasterComponent.addAll(serviceComponent.getServiceComponentHosts().keySet());
          }
        }
      }
  
      final Map<String, Host> clusterHosts = clustersProvider.get().getHostsForCluster(clusterName);
      for (Map.Entry<String, Host> hostEntry : clusterHosts.entrySet()) {
        final Host host = hostEntry.getValue();
        if (host.getMaintenanceState(cluster.getClusterId()) == MaintenanceState.ON && hostsWithMasterComponent.contains(host.getHostName())) {
          result.getFailedOn().add(host.getHostName());
  
          result.getFailedDetail().add(
              new HostDetail(host.getHostId(), host.getHostName()));
        }
      }
  
      if (!result.getFailedOn().isEmpty()) {
        result.setStatus(UpgradeCheckStatus.FAIL);
        result.setFailReason(getFailReason(result, request));
      }
  
      return result;
    }
  }
  