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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.commons.lang.math.RandomUtils;
24  import org.apache.hadoop.hbase.HBaseTestingUtility;
25  import org.apache.hadoop.hbase.HRegionInfo;
26  import org.apache.hadoop.hbase.TableName;
27  import org.apache.hadoop.hbase.client.Admin;
28  
29  /**
30   * Action to merge regions of a table.
31   */
32  public class MergeRandomAdjacentRegionsOfTableAction extends Action {
33    private final TableName tableName;
34    private final long sleepTime;
35  
36    public MergeRandomAdjacentRegionsOfTableAction(TableName tableName) {
37      this(-1, tableName);
38    }
39  
40    public MergeRandomAdjacentRegionsOfTableAction(int sleepTime, TableName tableName) {
41      this.tableName = tableName;
42      this.sleepTime = sleepTime;
43    }
44  
45    @Override
46    public void perform() throws Exception {
47      HBaseTestingUtility util = context.getHBaseIntegrationTestingUtility();
48      Admin admin = util.getHBaseAdmin();
49  
50      LOG.info("Performing action: Merge random adjacent regions of table " + tableName);
51      List<HRegionInfo> regions = admin.getTableRegions(tableName);
52      if (regions == null || regions.size() < 2) {
53        LOG.info("Table " + tableName + " doesn't have enough regions to merge");
54        return;
55      }
56  
57      int i = RandomUtils.nextInt(regions.size() - 1);
58      HRegionInfo a = regions.get(i++);
59      HRegionInfo b = regions.get(i);
60      LOG.debug("Merging " + a.getRegionNameAsString() + " and " + b.getRegionNameAsString());
61      try {
62        admin.mergeRegions(a.getEncodedNameAsBytes(), b.getEncodedNameAsBytes(), false);
63      } catch (Exception ex) {
64        LOG.warn("Merge failed, might be caused by other chaos: " + ex.getMessage());
65      }
66      if (sleepTime > 0) {
67        Thread.sleep(sleepTime);
68      }
69    }
70  }