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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.io.encoding.DataBlockEncoding;
28  import org.apache.hadoop.hbase.util.Bytes;
29  
30  /**
31   * Action that changes the encoding on a column family from a list of tables.
32   */
33  public class ChangeEncodingAction extends Action {
34    private final byte[] tableName;
35    private final String tableNameString;
36  
37    private HBaseAdmin admin;
38    private Random random;
39  
40    public ChangeEncodingAction(String tableName) {
41      tableNameString = tableName;
42      this.tableName = Bytes.toBytes(tableName);
43      this.random = new Random();
44    }
45  
46    @Override
47    public void init(ActionContext context) throws IOException {
48      super.init(context);
49      this.admin = context.getHBaseIntegrationTestingUtility().getHBaseAdmin();
50    }
51  
52    @Override
53    public void perform() throws Exception {
54      HTableDescriptor tableDescriptor = admin.getTableDescriptor(tableName);
55      HColumnDescriptor[] columnDescriptors = tableDescriptor.getColumnFamilies();
56  
57      if (columnDescriptors == null || columnDescriptors.length == 0) {
58        return;
59      }
60  
61      LOG.debug("Performing action: Changing encodings on " + tableNameString);
62      // possible DataBlockEncoding id's
63      int[] possibleIds = {0, 2, 3, 4, 6};
64      for (HColumnDescriptor descriptor : columnDescriptors) {
65        short id = (short) possibleIds[random.nextInt(possibleIds.length)];
66        descriptor.setDataBlockEncoding(DataBlockEncoding.getEncodingById(id));
67        LOG.debug("Set encoding of column family " + descriptor.getNameAsString()
68          + " to: " + descriptor.getDataBlockEncoding());
69      }
70  
71      admin.modifyTable(tableName, tableDescriptor);
72    }
73  }