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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.compress.Compression.Algorithm;
28  import org.apache.hadoop.hbase.util.Bytes;
29  import org.apache.hadoop.io.compress.Compressor;
30  
31  /**
32   * Action that changes the compression algorithm on a column family from a list of tables.
33   */
34  public class ChangeCompressionAction extends Action {
35    private final byte[] tableName;
36    private final String tableNameString;
37  
38    private HBaseAdmin admin;
39    private Random random;
40  
41    public ChangeCompressionAction(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      // Possible compression algorithms. If an algorithm is not supported,
63      // modifyTable will fail, so there is no harm.
64      Algorithm[] possibleAlgos = Algorithm.values();
65  
66      // Since not every compression algorithm is supported,
67      // let's use the same algorithm for all column families.
68  
69      // If an unsupported compression algorithm is chosen, pick a different one.
70      // This is to work around the issue that modifyTable() does not throw remote
71      // exception.
72      Algorithm algo;
73      do {
74        algo = possibleAlgos[random.nextInt(possibleAlgos.length)];
75  
76        try {
77          Compressor c = algo.getCompressor();
78  
79          // call returnCompressor() to release the Compressor
80          algo.returnCompressor(c);
81          break;
82        } catch (Throwable t) {
83          LOG.info("Performing action: Changing compression algorithms to " + algo +
84                  " is not supported, pick another one");
85        }
86      } while (true);
87  
88      LOG.debug("Performing action: Changing compression algorithms on "
89        + tableNameString + " to " + algo);
90      for (HColumnDescriptor descriptor : columnDescriptors) {
91        if (random.nextBoolean()) {
92          descriptor.setCompactionCompressionType(algo);
93        } else {
94          descriptor.setCompressionType(algo);
95        }
96      }
97  
98      admin.modifyTable(tableName, tableDescriptor);
99    }
100 }