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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.util.Collection;
22  import java.util.List;
23  
24  import org.apache.commons.lang.math.RandomUtils;
25  import org.apache.hadoop.hbase.HRegionInfo;
26  import org.apache.hadoop.hbase.ServerName;
27  import org.apache.hadoop.hbase.client.HBaseAdmin;
28  import org.apache.hadoop.hbase.util.Bytes;
29  
30  /**
31  * Action that tries to move every region of a table.
32  */
33  public class MoveRegionsOfTableAction extends Action {
34    private final long sleepTime;
35    private final byte[] tableNameBytes;
36    private final String tableName;
37  
38    public MoveRegionsOfTableAction(String tableName) {
39      this(-1, tableName);
40    }
41  
42    public MoveRegionsOfTableAction(long sleepTime, String tableName) {
43      this.sleepTime = sleepTime;
44      this.tableNameBytes = Bytes.toBytes(tableName);
45      this.tableName = tableName;
46    }
47  
48    @Override
49    public void perform() throws Exception {
50      HBaseAdmin admin = this.context.getHaseIntegrationTestingUtility().getHBaseAdmin();
51  
52      List<HRegionInfo> regions = admin.getTableRegions(tableNameBytes);
53      Collection<ServerName> serversList = admin.getClusterStatus().getServers();
54      ServerName[] servers = serversList.toArray(new ServerName[serversList.size()]);
55  
56      LOG.info("Performing action: Move regions of table " + tableName);
57      for (HRegionInfo regionInfo:regions) {
58        try {
59          String destServerName =
60            servers[RandomUtils.nextInt(servers.length)].getServerName();
61          LOG.debug("Moving " + regionInfo.getRegionNameAsString() + " to " + destServerName);
62          admin.move(regionInfo.getRegionName(), Bytes.toBytes(destServerName));
63        } catch (Exception e) {
64          LOG.debug("Error moving region", e);
65        }
66      }
67      if (sleepTime > 0) {
68        Thread.sleep(sleepTime);
69      }
70    }
71  }