com.jbw.recommendsystem.guiyihua.GYHMRD.java Source code

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Here is the source code for com.jbw.recommendsystem.guiyihua.GYHMRD.java

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package com.jbw.recommendsystem.guiyihua;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Partitioner;
import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;

// yarn jar com.jbw.recommendsystem.guiyihua.GYHMRD -Din= -Dout=

/**
 *
 * @author alvin
 */
public class GYHMRD extends Configured implements Tool {

    static class XXPartition extends Partitioner<LongWritable, Text> {

        @Override
        public int getPartition(LongWritable key, Text value, int i) {
            double dd = Math.random();
            if (dd > 0.8) {
                return 0;
            } else {
                return 1;
            }
        }
    }

    @Override
    public int run(String[] strings) throws Exception {
        Configuration conf = getConf();
        Path in = new Path(conf.get("in"));
        Path out = new Path(conf.get("out"));

        Job job = Job.getInstance(conf);
        job.setJarByClass(GYHMRD.class);
        job.setJobName("fdsjh");
        job.setMapOutputKeyClass(LongWritable.class);
        job.setMapOutputValueClass(Text.class);
        job.setInputFormatClass(TextInputFormat.class);

        job.setPartitionerClass(XXPartition.class);

        job.setOutputFormatClass(TextOutputFormat.class);
        job.setOutputKeyClass(LongWritable.class);
        job.setOutputValueClass(Text.class);

        job.setNumReduceTasks(2);

        TextInputFormat.addInputPath(job, in);
        TextOutputFormat.setOutputPath(job, out);
        return job.waitForCompletion(true) ? 0 : 1;
    }

    public static void main(String[] args) throws Exception {
        System.exit(ToolRunner.run(new GYHMRD(), args));
    }
}