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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.client.HBaseAdmin;
27  import org.apache.hadoop.hbase.util.Bytes;
28  
29  /**
30   * Action to merge regions of a table.
31   */
32  public class MergeRandomAdjacentRegionsOfTableAction extends Action {
33    private final byte[] tableNameBytes;
34    private final String tableName;
35    private final long sleepTime;
36  
37    public MergeRandomAdjacentRegionsOfTableAction(String tableName) {
38      this(-1, tableName);
39    }
40  
41    public MergeRandomAdjacentRegionsOfTableAction(int sleepTime, String tableName) {
42      this.tableNameBytes = Bytes.toBytes(tableName);
43      this.tableName = tableName;
44      this.sleepTime = sleepTime;
45    }
46  
47    @Override
48    public void perform() throws Exception {
49      HBaseTestingUtility util = context.getHBaseIntegrationTestingUtility();
50      HBaseAdmin admin = util.getHBaseAdmin();
51  
52      LOG.info("Performing action: Merge random adjacent regions of table " + tableName);
53      List<HRegionInfo> regions = admin.getTableRegions(tableNameBytes);
54      if (regions == null || regions.size() < 2) {
55        LOG.info("Table " + tableName + " doesn't have enough regions to merge");
56        return;
57      }
58  
59      int i = RandomUtils.nextInt(regions.size() - 1);
60      HRegionInfo a = regions.get(i++);
61      HRegionInfo b = regions.get(i);
62      LOG.debug("Merging " + a.getRegionNameAsString() + " and " + b.getRegionNameAsString());
63      try {
64        admin.mergeRegions(a.getEncodedNameAsBytes(), b.getEncodedNameAsBytes(), false);
65      } catch (Exception ex) {
66        LOG.warn("Merge failed, might be caused by other chaos: " + ex.getMessage());
67      }
68      if (sleepTime > 0) {
69        Thread.sleep(sleepTime);
70      }
71    }
72  }