001/** 002 * Copyright (c) 2011, The University of Southampton and the individual contributors. 003 * All rights reserved. 004 * 005 * Redistribution and use in source and binary forms, with or without modification, 006 * are permitted provided that the following conditions are met: 007 * 008 * * Redistributions of source code must retain the above copyright notice, 009 * this list of conditions and the following disclaimer. 010 * 011 * * Redistributions in binary form must reproduce the above copyright notice, 012 * this list of conditions and the following disclaimer in the documentation 013 * and/or other materials provided with the distribution. 014 * 015 * * Neither the name of the University of Southampton nor the names of its 016 * contributors may be used to endorse or promote products derived from this 017 * software without specific prior written permission. 018 * 019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 020 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 021 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 022 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR 023 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 024 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 025 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 026 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 027 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 028 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 029 */ 030package org.openimaj.hadoop.mapreduce.stage.helper; 031 032import org.apache.hadoop.conf.Configuration; 033import org.apache.hadoop.fs.Path; 034import org.apache.hadoop.io.NullWritable; 035import org.apache.hadoop.io.Text; 036import org.apache.hadoop.mapreduce.Job; 037import org.apache.hadoop.mapreduce.lib.input.FileInputFormat; 038import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat; 039import org.apache.hadoop.mapreduce.lib.output.MultipleOutputs; 040import org.apache.hadoop.mapreduce.lib.output.NullOutputFormat; 041import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat; 042import org.openimaj.hadoop.mapreduce.stage.Stage; 043 044/** 045 * A helper class for a common stage type. In this case, a stage that goes from 046 * text to a sequence file of bytes indexed by longs 047 * 048 * @author Sina Samangooei (ss@ecs.soton.ac.uk) 049 * @param <INPUT_FORMAT> 050 * @param <INPUT_KEY> 051 * @param <INPUT_VALUE> 052 * @param <MAP_OUTPUT_KEY> 053 * @param <MAP_OUTPUT_VALUE> 054 * @param <OUTPUT_KEY> 055 * @param <OUTPUT_VALUE> 056 * 057 */ 058public abstract class MultipleOutputStage<INPUT_FORMAT extends FileInputFormat<INPUT_KEY, INPUT_VALUE>, INPUT_KEY, INPUT_VALUE, MAP_OUTPUT_KEY, MAP_OUTPUT_VALUE, OUTPUT_KEY, OUTPUT_VALUE> 059 extends 060 Stage< 061 INPUT_FORMAT, 062 FileOutputFormat<OUTPUT_KEY, OUTPUT_VALUE>, 063 INPUT_KEY, INPUT_VALUE, 064 MAP_OUTPUT_KEY, MAP_OUTPUT_VALUE, 065 OUTPUT_KEY, OUTPUT_VALUE 066 > 067{ 068 069 @Override 070 public abstract Class<? extends MultipleOutputReducer<MAP_OUTPUT_KEY, MAP_OUTPUT_VALUE, OUTPUT_KEY, OUTPUT_VALUE>> 071 reducer(); 072 073 @Override 074 public Job stage(Path[] inputs, Path output, Configuration conf) throws Exception { 075 076 final Job job = super.stage(inputs, output, conf); 077 job.setOutputFormatClass(NullOutputFormat.class); 078 MultipleOutputs.addNamedOutput(job, "text", TextOutputFormat.class, NullWritable.class, Text.class); 079 return job; 080 } 081}