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