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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.commons.lang.RandomStringUtils;
25  import org.apache.hadoop.hbase.HColumnDescriptor;
26  import org.apache.hadoop.hbase.HTableDescriptor;
27  import org.apache.hadoop.hbase.client.HBaseAdmin;
28  import org.apache.hadoop.hbase.util.Bytes;
29  
30  /**
31   * Action the adds a column family to a table.
32   */
33  public class AddColumnAction extends Action {
34    private final Random random;
35    private final byte[] tableName;
36    private HBaseAdmin admin;
37  
38    public AddColumnAction(String tableName) {
39      this.tableName = Bytes.toBytes(tableName);
40      this.random = new Random();
41    }
42  
43    @Override
44    public void init(ActionContext context) throws IOException {
45      super.init(context);
46      this.admin = context.getHaseIntegrationTestingUtility().getHBaseAdmin();
47    }
48  
49    @Override
50    public void perform() throws Exception {
51      HTableDescriptor tableDescriptor = admin.getTableDescriptor(tableName);
52      HColumnDescriptor columnDescriptor = null;
53  
54      while(columnDescriptor == null ||
55          tableDescriptor.getFamily(columnDescriptor.getName()) != null) {
56        columnDescriptor = new HColumnDescriptor(RandomStringUtils.randomAlphabetic(5));
57      }
58  
59      tableDescriptor.addFamily(columnDescriptor);
60      admin.modifyTable(tableName, tableDescriptor);
61    }
62  }