1   /**
2    * Copyright 2010 The Apache Software Foundation
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *     http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing, software
15   * distributed under the License is distributed on an "AS IS" BASIS,
16   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17   * See the License for the specific language governing permissions and
18   * limitations under the License.
19   */
20  package org.apache.hadoop.hbase.regionserver.wal;
21  
22  import java.io.IOException;
23  
24  import org.apache.hadoop.hbase.util.Bytes;
25  
26  public class InstrumentedSequenceFileLogWriter extends SequenceFileLogWriter {
27  
28    public InstrumentedSequenceFileLogWriter() {
29      super(HLogKey.class);
30    }
31    
32    public static boolean activateFailure = false;
33    @Override
34      public void append(HLog.Entry entry) throws IOException {
35        super.append(entry);
36        if (activateFailure && Bytes.equals(entry.getKey().getEncodedRegionName(), "break".getBytes())) {
37          System.out.println(getClass().getName() + ": I will throw an exception now...");
38          throw(new IOException("This exception is instrumented and should only be thrown for testing"));
39        }
40      }
41  }