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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.io.IOException;
22  import java.util.Random;
23  
24  import org.apache.hadoop.hbase.HColumnDescriptor;
25  import org.apache.hadoop.hbase.HTableDescriptor;
26  import org.apache.hadoop.hbase.client.HBaseAdmin;
27  import org.apache.hadoop.hbase.util.Bytes;
28  
29  /**
30   * Action that changes the number of versions on a column family from a list of tables.
31   *
32   * Always keeps at least 1 as the number of versions.
33   */
34  public class ChangeVersionsAction extends Action {
35    private final byte[] tableName;
36    private final String tableNameString;
37  
38    private HBaseAdmin admin;
39    private Random random;
40  
41    public ChangeVersionsAction(String tableName) {
42      tableNameString = tableName;
43      this.tableName = Bytes.toBytes(tableName);
44      this.random = new Random();
45    }
46  
47    @Override
48    public void init(ActionContext context) throws IOException {
49      super.init(context);
50      this.admin = context.getHBaseIntegrationTestingUtility().getHBaseAdmin();
51    }
52  
53    @Override
54    public void perform() throws Exception {
55      HTableDescriptor tableDescriptor = admin.getTableDescriptor(tableName);
56      HColumnDescriptor[] columnDescriptors = tableDescriptor.getColumnFamilies();
57  
58      if ( columnDescriptors == null || columnDescriptors.length == 0) {
59        return;
60      }
61  
62      int versions =  random.nextInt(3) + 1;
63      for(HColumnDescriptor descriptor:columnDescriptors) {
64        descriptor.setMaxVersions(versions);
65        descriptor.setMinVersions(versions);
66      }
67      LOG.debug("Performing action: Changing versions on " + tableNameString);
68      admin.modifyTable(tableName, tableDescriptor);
69    }
70  }