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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.mapred;
21  
22  import java.io.IOException;
23  import java.util.Iterator;
24  
25  import org.apache.commons.logging.Log;
26  import org.apache.commons.logging.LogFactory;
27  import org.apache.hadoop.hbase.client.Put;
28  import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
29  import org.apache.hadoop.mapred.MapReduceBase;
30  import org.apache.hadoop.mapred.OutputCollector;
31  import org.apache.hadoop.mapred.Reporter;
32  
33  /**
34   * Write to table each key, record pair
35   */
36  @Deprecated
37  public class IdentityTableReduce
38  extends MapReduceBase
39  implements TableReduce<ImmutableBytesWritable, Put> {
40    @SuppressWarnings("unused")
41    private static final Log LOG =
42      LogFactory.getLog(IdentityTableReduce.class.getName());
43  
44    /**
45     * No aggregation, output pairs of (key, record)
46     * @param key
47     * @param values
48     * @param output
49     * @param reporter
50     * @throws IOException
51     */
52    public void reduce(ImmutableBytesWritable key, Iterator<Put> values,
53        OutputCollector<ImmutableBytesWritable, Put> output,
54        Reporter reporter)
55        throws IOException {
56  
57      while(values.hasNext()) {
58        output.collect(key, values.next());
59      }
60    }
61  }