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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.TableName;
26  import org.apache.hadoop.hbase.chaos.monkies.PolicyBasedChaosMonkey;
27  import org.apache.hadoop.hbase.client.Admin;
28  import org.slf4j.Logger;
29  import org.slf4j.LoggerFactory;
30  
31  /**
32  * Action that tries to move a random region of a table.
33  */
34  public class MoveRandomRegionOfTableAction extends Action {
35    private static final Logger LOG =
36        LoggerFactory.getLogger(MoveRandomRegionOfTableAction.class);
37    private final long sleepTime;
38    private final TableName tableName;
39  
40    public MoveRandomRegionOfTableAction(TableName tableName) {
41      this(-1, tableName);
42    }
43  
44    public MoveRandomRegionOfTableAction(long sleepTime, TableName tableName) {
45      this.sleepTime = sleepTime;
46      this.tableName = tableName;
47    }
48  
49    @Override protected Logger getLogger() {
50      return LOG;
51    }
52  
53    @Override
54    public void perform() throws Exception {
55      if (sleepTime > 0) {
56        Thread.sleep(sleepTime);
57      }
58  
59      HBaseTestingUtility util = context.getHBaseIntegrationTestingUtility();
60      Admin admin = util.getHBaseAdmin();
61  
62      getLogger().info("Performing action: Move random region of table " + tableName);
63      List<HRegionInfo> regions = admin.getTableRegions(tableName);
64      if (regions == null || regions.isEmpty()) {
65        getLogger().info("Table " + tableName + " doesn't have regions to move");
66        return;
67      }
68  
69      HRegionInfo region = PolicyBasedChaosMonkey.selectRandomItem(
70        regions.toArray(new HRegionInfo[regions.size()]));
71      getLogger().debug("Unassigning region " + region.getRegionNameAsString());
72      admin.unassign(region.getRegionName(), false);
73      if (sleepTime > 0) {
74        Thread.sleep(sleepTime);
75      }
76    }
77  }