MapReduce jobs can be written in multiple ways, depending on what the desired outcome is. The fundamental structure of a MapReduce job is as follows:
import java.io.IOException;
import java.util.StringTokenizer;
import java.util.Map;
import java.util.HashMap;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.GenericOptionsParser;
import org.apache.commons.lang.StringEscapeUtils;
public class EnglishWordCounter {
public static class WordMapper
extends Mapper<Object, Text, Text, IntWritable>...