001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.chaos.actions;
019
020import java.io.IOException;
021import java.util.ArrayList;
022import java.util.List;
023import org.apache.hadoop.hbase.ServerName;
024import org.apache.hadoop.hbase.chaos.monkies.PolicyBasedChaosMonkey;
025import org.apache.hadoop.hbase.util.CommonFSUtils;
026import org.apache.hadoop.hdfs.DFSClient;
027import org.apache.hadoop.hdfs.DistributedFileSystem;
028import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
029import org.apache.hadoop.hdfs.protocol.HdfsConstants;
030import org.slf4j.Logger;
031import org.slf4j.LoggerFactory;
032
033/**
034 * Action that restarts a random datanode.
035 */
036public class RestartRandomDataNodeAction extends RestartActionBaseAction {
037  private static final Logger LOG = LoggerFactory.getLogger(RestartRandomDataNodeAction.class);
038
039  public RestartRandomDataNodeAction(long sleepTime) {
040    super(sleepTime);
041  }
042
043  @Override
044  protected Logger getLogger() {
045    return LOG;
046  }
047
048  @Override
049  public void perform() throws Exception {
050    getLogger().info("Performing action: Restart random data node");
051    ServerName server = PolicyBasedChaosMonkey.selectRandomItem(getDataNodes());
052    restartDataNode(server, sleepTime);
053  }
054
055  public ServerName[] getDataNodes() throws IOException {
056    DistributedFileSystem fs =
057      (DistributedFileSystem) CommonFSUtils.getRootDir(getConf()).getFileSystem(getConf());
058    DFSClient dfsClient = fs.getClient();
059    List<ServerName> hosts = new ArrayList<>();
060    for (DatanodeInfo dataNode : dfsClient.datanodeReport(HdfsConstants.DatanodeReportType.LIVE)) {
061      hosts.add(ServerName.valueOf(dataNode.getHostName(), -1, -1));
062    }
063    return hosts.toArray(new ServerName[0]);
064  }
065}