io.aos.t4f.hadoop.mapreduce.WordCountMapReduceTest3.java Source code

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package io.aos.t4f.hadoop.mapreduce;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.StringTokenizer;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.filecache.DistributedCache;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
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;

public class WordCountMapReduceTest3 {

    private static Map<Text, IntWritable> map = new HashMap<Text, IntWritable>();

    public void testMapReduce() throws Exception {

        String inputPath = "/docs/ChangesFancyStyle.css";
        String outputPath = "/out";

        Configuration configuration = new Configuration();
        configuration.set("fs.default.name", "hdfs://ppc006:54310");
        configuration.set("mapred.job.tracker", "ppc006:54311");
        configuration.set("mapred.job.tracker", "local");
        configuration.set("fs.default.name", "local");

        DistributedCache.addArchiveToClassPath(new Path("/jar/t4f-nosql-hadoop-1.0-SNAPSHOT.jar"), configuration);

        Job job = new Job(configuration);
        //        job.setJarByClass(Driver.class);
        job.setJobName("TestJob");
        job.setMapperClass(MapClass.class);
        job.setReducerClass(ReduceClass.class);
        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(IntWritable.class);

        FileInputFormat.addInputPath(job, new Path(inputPath));
        FileOutputFormat.setOutputPath(job, new Path(outputPath));

        job.waitForCompletion(true);

    }

    public static class MapClass extends Mapper<LongWritable, Text, Text, IntWritable> {

        private final static IntWritable one = new IntWritable(1);
        private Text word = new Text();

        @Override
        public void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
            String line = value.toString();
            StringTokenizer itr = new StringTokenizer(line);
            while (itr.hasMoreTokens()) {
                word.set(itr.nextToken());
                context.write(word, one);
            }
        }

    }

    /**
     * A reducer class that just emits the sum of the input values.
     */
    public static class ReduceClass extends Reducer<Text, IntWritable, Text, IntWritable> {

        private IntWritable result = new IntWritable();

        @Override
        public void reduce(Text key, Iterable<IntWritable> values, Context context)
                throws IOException, InterruptedException {
            int sum = 0;
            for (IntWritable val : values) {
                sum += val.get();
            }
            result.set(sum);
            context.write(key, result);
            map.put(key, result);
            System.out.println("===" + map.size());
        }

    }

}