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1   /**
2    *
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *     http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing, software
14   * distributed under the License is distributed on an "AS IS" BASIS,
15   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16   * See the License for the specific language governing permissions and
17   * limitations under the License.
18   */
19  package org.apache.hadoop.hbase.regionserver.wal;
20  
21  import java.io.IOException;
22  
23  import org.apache.hadoop.hbase.util.Bytes;
24  import org.apache.hadoop.hbase.wal.WAL.Entry;
25  
26  public class InstrumentedLogWriter extends ProtobufLogWriter {
27  
28    public InstrumentedLogWriter() {
29      super();
30    }
31  
32    public static boolean activateFailure = false;
33    @Override
34      public void append(Entry entry) throws IOException {
35        super.append(entry);
36        if (activateFailure &&
37            Bytes.equals(entry.getKey().getEncodedRegionName(), "break".getBytes())) {
38          System.out.println(getClass().getName() + ": I will throw an exception now...");
39          throw(new IOException("This exception is instrumented and should only be thrown for testing"
40              ));
41        }
42      }
43  }