org.apache.hadoop.examples.Sort Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
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*/
package org.apache.hadoop.examples;
import java.io.IOException;
import java.net.URI;
import java.util.*;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.mapreduce.filecache.DistributedCache;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.mapred.ClusterStatus;
import org.apache.hadoop.mapred.JobClient;
import org.apache.hadoop.mapreduce.*;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.mapreduce.lib.output.SequenceFileOutputFormat;
import org.apache.hadoop.mapreduce.lib.partition.InputSampler;
import org.apache.hadoop.mapreduce.lib.partition.TotalOrderPartitioner;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
/**
* This is the trivial map/reduce program that does absolutely nothing
* other than use the framework to fragment and sort the input values.
*
* To run: bin/hadoop jar build/hadoop-examples.jar sort
* [-r reduces]
* [-inFormat input format class]
* [-outFormat output format class]
* [-outKey output key class]
* [-outValue output value class]
* [-totalOrder pcnt num samples max splits]
* in-dir out-dir
*/
public class Sort extends Configured implements Tool {
public static final String REDUCES_PER_HOST =
"mapreduce.sort.reducesperhost";
private Job job = null;
static int printUsage() {
System.out.println("sort [-r ] " +
"[-inFormat ] " +
"[-outFormat