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BspRecordWriter xref
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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.giraph.bsp;
20  
21  import java.io.IOException;
22  
23  import org.apache.hadoop.io.Text;
24  import org.apache.hadoop.mapreduce.RecordWriter;
25  import org.apache.hadoop.mapreduce.TaskAttemptContext;
26  
27  /**
28   * Used by {@link BspOutputFormat} since some versions of Hadoop
29   * require that a RecordWriter is returned from getRecordWriter.
30   * Does nothing, except insures that write is never called.
31   */
32  public class BspRecordWriter extends RecordWriter<Text, Text> {
33  
34    @Override
35    public void close(TaskAttemptContext context)
36      throws IOException, InterruptedException {
37      // Do nothing
38    }
39  
40    @Override
41    public void write(Text key, Text value)
42      throws IOException, InterruptedException {
43      throw new IOException("write: Cannot write with " +
44          getClass().getName() +
45          ".  Should never be called");
46    }
47  }