/**
* 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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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.ServerName;
import org.apache.hadoop.hbase.chaos.monkies.PolicyBasedChaosMonkey;
import org.apache.hadoop.hbase.util.FSUtils;
import org.apache.hadoop.hdfs.DFSClient;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.hdfs.protocol.HdfsConstants;
import java.io.IOException;
import java.util.LinkedList;
import java.util.List;
/**
* Action that restarts a random datanode.
*/
public class RestartRandomDataNodeAction extends RestartActionBaseAction {
public RestartRandomDataNodeAction(long sleepTime) {
super(sleepTime);
}
@Override
public void perform() throws Exception {
LOG.info("Performing action: Restart random data node");
ServerName server = PolicyBasedChaosMonkey.selectRandomItem(getDataNodes());
restartDataNode(server, sleepTime);
}
public ServerName[] getDataNodes() throws IOException {
DistributedFileSystem fs = (DistributedFileSystem) FSUtils.getRootDir(getConf())
.getFileSystem(getConf());
DFSClient dfsClient = fs.getClient();
List<ServerName> hosts = new LinkedList<>();
for (DatanodeInfo dataNode: dfsClient.datanodeReport(HdfsConstants.DatanodeReportType.LIVE)) {
hosts.add(ServerName.valueOf(dataNode.getHostName(), -1, -1));
}
return hosts.toArray(new ServerName[hosts.size()]);
}
}