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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.client.HTable;
28  
29  /**
30  * Action that restarts an HRegionServer holding one of the regions of the table.
31  */
32  public class RestartRsHoldingTableAction extends RestartActionBaseAction {
33  
34    private final String tableName;
35  
36    public RestartRsHoldingTableAction(long sleepTime, String tableName) {
37      super(sleepTime);
38      this.tableName = tableName;
39    }
40  
41    @Override
42    public void perform() throws Exception {
43      HTable table = null;
44      try {
45        Configuration conf = context.getHBaseIntegrationTestingUtility().getConfiguration();
46        table = new HTable(conf, tableName);
47      } catch (IOException e) {
48        LOG.debug("Error creating HTable used to get list of region locations.", e);
49        return;
50      }
51  
52      Collection<ServerName> serverNames = table.getRegionLocations().values();
53      ServerName[] nameArray = serverNames.toArray(new ServerName[serverNames.size()]);
54  
55      restartRs(nameArray[RandomUtils.nextInt(nameArray.length)], sleepTime);
56    }
57  }