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 * <p>
010 * http://www.apache.org/licenses/LICENSE-2.0
011 * <p>
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 */
018
019package org.apache.hadoop.hbase.chaos.actions;
020
021import java.io.IOException;
022import java.util.LinkedList;
023import java.util.List;
024
025import org.apache.hadoop.hbase.ServerName;
026import org.apache.hadoop.hbase.chaos.monkies.PolicyBasedChaosMonkey;
027import org.apache.hadoop.hbase.util.FSUtils;
028import org.apache.hadoop.hdfs.DFSClient;
029import org.apache.hadoop.hdfs.DistributedFileSystem;
030import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
031import org.apache.hadoop.hdfs.protocol.HdfsConstants;
032import org.slf4j.Logger;
033import org.slf4j.LoggerFactory;
034
035/**
036 * Action that restarts a random datanode.
037 */
038public class RestartRandomDataNodeAction extends RestartActionBaseAction {
039  private static final Logger LOG = LoggerFactory.getLogger(RestartRandomDataNodeAction.class);
040
041  public RestartRandomDataNodeAction(long sleepTime) {
042    super(sleepTime);
043  }
044
045  @Override
046  public void perform() throws Exception {
047    LOG.info("Performing action: Restart random data node");
048    ServerName server = PolicyBasedChaosMonkey.selectRandomItem(getDataNodes());
049    restartDataNode(server, sleepTime);
050  }
051
052  public ServerName[] getDataNodes() throws IOException {
053    DistributedFileSystem fs = (DistributedFileSystem) FSUtils.getRootDir(getConf())
054        .getFileSystem(getConf());
055    DFSClient dfsClient = fs.getClient();
056    List<ServerName> hosts = new LinkedList<>();
057    for (DatanodeInfo dataNode: dfsClient.datanodeReport(HdfsConstants.DatanodeReportType.LIVE)) {
058      hosts.add(ServerName.valueOf(dataNode.getHostName(), -1, -1));
059    }
060    return hosts.toArray(new ServerName[hosts.size()]);
061  }
062}