/*
    * 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.hbase.chaos.actions;
  
  import org.apache.hadoop.hbase.ClusterStatus;
  import org.apache.hadoop.hbase.ServerName;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
  * Action that tries to restart the HRegionServer holding Meta.
  */
  public class RestartRsHoldingMetaAction extends RestartActionBaseAction {
    private static final Logger LOG =
        LoggerFactory.getLogger(RestartRsHoldingMetaAction.class);
  
    public RestartRsHoldingMetaAction(long sleepTime) {
      super(sleepTime);
    }
  
    @Override protected Logger getLogger() {
      return LOG;
    }
  
    @Override
    public void perform() throws Exception {
      getLogger().info("Performing action: Restart region server holding META");
      ServerName server = cluster.getServerHoldingMeta();
      if (server == null) {
        getLogger().warn("No server is holding hbase:meta right now.");
        return;
      }
      ClusterStatus clusterStatus = cluster.getClusterStatus();
      if (server.equals(clusterStatus.getMaster())) {
        // Master holds the meta, so restart the master.
        restartMaster(server, sleepTime);
      } else {
        restartRs(server, sleepTime);
      }
    }
  }