001/**
002 *
003 * Licensed to the Apache Software Foundation (ASF) under one
004 * or more contributor license agreements.  See the NOTICE file
005 * distributed with this work for additional information
006 * regarding copyright ownership.  The ASF licenses this file
007 * to you under the Apache License, Version 2.0 (the
008 * "License"); you may not use this file except in compliance
009 * with the License.  You may obtain a copy of the License at
010 *
011 *     http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 */
019package org.apache.hadoop.hbase.mapred;
020
021import java.io.IOException;
022import java.util.Iterator;
023
024import org.apache.yetus.audience.InterfaceAudience;
025import org.slf4j.Logger;
026import org.slf4j.LoggerFactory;
027import org.apache.hadoop.hbase.client.Put;
028import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
029import org.apache.hadoop.mapred.MapReduceBase;
030import org.apache.hadoop.mapred.OutputCollector;
031import org.apache.hadoop.mapred.Reporter;
032
033/**
034 * Write to table each key, record pair
035 */
036@InterfaceAudience.Public
037public class IdentityTableReduce
038extends MapReduceBase
039implements TableReduce<ImmutableBytesWritable, Put> {
040  @SuppressWarnings("unused")
041  private static final Logger LOG =
042    LoggerFactory.getLogger(IdentityTableReduce.class.getName());
043
044  /**
045   * No aggregation, output pairs of (key, record)
046   * @param key
047   * @param values
048   * @param output
049   * @param reporter
050   * @throws IOException
051   */
052  public void reduce(ImmutableBytesWritable key, Iterator<Put> values,
053      OutputCollector<ImmutableBytesWritable, Put> output,
054      Reporter reporter)
055      throws IOException {
056
057    while(values.hasNext()) {
058      output.collect(key, values.next());
059    }
060  }
061}