1 /**
2  * Licensed to the Apache Software Foundation (ASF) under one
3  * or more contributor license agreements.  See the NOTICE file
4  * distributed with this work for additional information
5  * regarding copyright ownership.  The ASF licenses this file
6  * to you under the Apache License, Version 2.0 (the
7  * "License"); you may not use this file except in compliance
8  * with the License.  You may obtain a copy of the License at
9  *
10  *     http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18 
19 package org.apache.hadoop.hbase.chaos.actions;
20 
21 import java.io.IOException;
22 import java.util.Collection;
23 
24 import org.apache.commons.lang.math.RandomUtils;
25 import org.apache.hadoop.conf.Configuration;
26 import org.apache.hadoop.hbase.ServerName;
27 import org.apache.hadoop.hbase.TableName;
28 import org.apache.hadoop.hbase.client.HTable;
29 
30 /**
31 * Action that restarts an HRegionServer holding one of the regions of the table.
32 */
33 public class RestartRsHoldingTableAction extends RestartActionBaseAction {
34 
35   private final String tableName;
36 
RestartRsHoldingTableAction(long sleepTime, String tableName)37   public RestartRsHoldingTableAction(long sleepTime, String tableName) {
38     super(sleepTime);
39     this.tableName = tableName;
40   }
41 
42   @Override
perform()43   public void perform() throws Exception {
44     HTable table = null;
45     try {
46       LOG.info("Performing action: Restart random RS holding table " + this.tableName);
47       Configuration conf = context.getHBaseIntegrationTestingUtility().getConfiguration();
48       table = new HTable(conf, TableName.valueOf(tableName));
49     } catch (IOException e) {
50       LOG.debug("Error creating HTable used to get list of region locations.", e);
51       return;
52     }
53 
54     Collection<ServerName> serverNames = table.getRegionLocations().values();
55     ServerName[] nameArray = serverNames.toArray(new ServerName[serverNames.size()]);
56 
57     restartRs(nameArray[RandomUtils.nextInt(nameArray.length)], sleepTime);
58   }
59 }
60