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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  
23  import org.apache.commons.lang.RandomStringUtils;
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 the adds a column family to a table.
31   */
32  public class AddColumnAction extends Action {
33    private final byte[] tableName;
34    private final String tableNameString;
35    private HBaseAdmin admin;
36  
37    public AddColumnAction(String tableName) {
38      tableNameString = tableName;
39      this.tableName = Bytes.toBytes(tableName);
40    }
41  
42    @Override
43    public void init(ActionContext context) throws IOException {
44      super.init(context);
45      this.admin = context.getHBaseIntegrationTestingUtility().getHBaseAdmin();
46    }
47  
48    @Override
49    public void perform() throws Exception {
50      HTableDescriptor tableDescriptor = admin.getTableDescriptor(tableName);
51      HColumnDescriptor columnDescriptor = null;
52  
53      while(columnDescriptor == null ||
54          tableDescriptor.getFamily(columnDescriptor.getName()) != null) {
55        columnDescriptor = new HColumnDescriptor(RandomStringUtils.randomAlphabetic(5));
56      }
57  
58      LOG.debug("Performing action: Adding " + columnDescriptor + " to " + tableNameString);
59  
60      tableDescriptor.addFamily(columnDescriptor);
61      admin.modifyTable(tableName, tableDescriptor);
62    }
63  }