HD-trab1/Trab1.java at master · dfberg/HD-trab1 · GitHub

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package org.dfberg;

/* -------------------------------------------------------------------------------------------------
 *
 * Autores: Diego Felipe Berg Mauricio Pardin
 *
 *
 *
 *Compilação:
 *javac -Xlint -classpath `yarn classpath` -d trab1/ Trab1.java
 *
 *Criando JAR:
 *jar -cvf trab1.jar -C trab1/ .
 *
 *Execução:
 *hadoop jar trab1.jar org.dfberg.Trab1 <entrada> <saida>

-------------------------------------------------------------------------------------------------*/

import java.io.IOException;
import java.util.*;

import org.apache.hadoop.fs.Path;
import org.apache.hadoop.conf.*;
import org.apache.hadoop.io.*;
import org.apache.hadoop.mapreduce.*;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;

public class Trab1 {

 public static class Map extends Mapper<LongWritable, Text, Text, IntWritable> {
    private final static IntWritable one = new IntWritable(1);

    public void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
        String [] line = value.toString().split(":::"); // Campos separados por :::
        for (String a : line[1].split("::")) { // Autores separados por ::
            for (String p: line[2].replaceAll("[^a-zA-Z -]", "").toLowerCase().split("\\s+")) {
                // remove pontuação e números.
                if (p.length() > 2)
                context.write(new Text(a + "," + p), one);
            }
        }
    }
 }

 public static class Reduce extends Reducer<Text, IntWritable, Text, IntWritable> {

    public void reduce(Text key, Iterable<IntWritable> values, Context context)
      throws IOException, InterruptedException {
        int sum = 0;
        for (IntWritable val : values) {
            sum += val.get();
        }
        context.write(key, new IntWritable(sum));
    }
 }

 public static void main(String[] args) throws Exception {
    Configuration conf = new Configuration();

    Job job = new Job(conf, "Trab1");

    job.setJarByClass(Trab1.class);

    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(IntWritable.class);

    job.setMapperClass(Map.class);
    job.setReducerClass(Reduce.class);

    job.setInputFormatClass(TextInputFormat.class);
    job.setOutputFormatClass(TextOutputFormat.class);

    FileInputFormat.addInputPath(job, new Path(args[0]));
    FileOutputFormat.setOutputPath(job, new Path(args[1]));

    job.waitForCompletion(true);
 }

}