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