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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.TableName;
27  import org.apache.hadoop.hbase.client.Admin;
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 TableName tableName;
36  
37    private Admin admin;
38    private Random random;
39  
40    public ChangeVersionsAction(TableName tableName) {
41      this.tableName = tableName;
42      this.random = new Random();
43    }
44  
45    @Override
46    public void init(ActionContext context) throws IOException {
47      super.init(context);
48      this.admin = context.getHBaseIntegrationTestingUtility().getHBaseAdmin();
49    }
50  
51    @Override
52    public void perform() throws Exception {
53      HTableDescriptor tableDescriptor = admin.getTableDescriptor(tableName);
54      HColumnDescriptor[] columnDescriptors = tableDescriptor.getColumnFamilies();
55  
56      if ( columnDescriptors == null || columnDescriptors.length == 0) {
57        return;
58      }
59  
60      int versions =  random.nextInt(3) + 1;
61      for(HColumnDescriptor descriptor:columnDescriptors) {
62        descriptor.setVersions(versions, versions);
63      }
64      // Don't try the modify if we're stopping
65      if (context.isStopping()) {
66        return;
67      }
68      LOG.debug("Performing action: Changing versions on " + tableName.getNameAsString());
69      admin.modifyTable(tableName, tableDescriptor);
70    }
71  }