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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.List;
22  
23  import org.apache.hadoop.hbase.HBaseTestingUtility;
24  import org.apache.hadoop.hbase.HRegionInfo;
25  import org.apache.hadoop.hbase.chaos.monkies.PolicyBasedChaosMonkey;
26  import org.apache.hadoop.hbase.client.HBaseAdmin;
27  import org.apache.hadoop.hbase.util.Bytes;
28  
29  /**
30  * Action that tries to move a random region of a table.
31  */
32  public class MoveRandomRegionOfTableAction extends Action {
33    private final long sleepTime;
34    private final byte[] tableNameBytes;
35    private final String tableName;
36  
37    public MoveRandomRegionOfTableAction(String tableName) {
38      this(-1, tableName);
39    }
40  
41    public MoveRandomRegionOfTableAction(long sleepTime, String tableName) {
42      this.sleepTime = sleepTime;
43      this.tableNameBytes = Bytes.toBytes(tableName);
44      this.tableName = tableName;
45    }
46  
47    @Override
48    public void perform() throws Exception {
49      if (sleepTime > 0) {
50        Thread.sleep(sleepTime);
51      }
52  
53      HBaseTestingUtility util = context.getHBaseIntegrationTestingUtility();
54      HBaseAdmin admin = util.getHBaseAdmin();
55  
56      LOG.info("Performing action: Move random region of table " + tableName);
57      List<HRegionInfo> regions = admin.getTableRegions(tableNameBytes);
58      if (regions == null || regions.isEmpty()) {
59        LOG.info("Table " + tableName + " doesn't have regions to move");
60        return;
61      }
62  
63      HRegionInfo region = PolicyBasedChaosMonkey.selectRandomItem(
64        regions.toArray(new HRegionInfo[regions.size()]));
65      LOG.debug("Unassigning region " + region.getRegionNameAsString());
66      admin.unassign(region.getRegionName(), false);
67      if (sleepTime > 0) {
68        Thread.sleep(sleepTime);
69      }
70    }
71  }