com.jbw.recommendsystem.cooc.CoocMRD.java Source code

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Here is the source code for com.jbw.recommendsystem.cooc.CoocMRD.java

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package com.jbw.recommendsystem.cooc;

import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
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.lib.input.TextInputFormat;
import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;
import org.apache.hadoop.mapreduce.lib.reduce.IntSumReducer;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;

//yarn jar target/RecommendSystem-0.jar com.jbw.recommendsystem.cooc.CoocMRD -Dinput=/user/jiabw/out/rs/relation_1/part-r-00000 -Doutput=/user/jiabw/out/rs/cooc_1

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

    static class CoocMapper extends Mapper<LongWritable, Text, Text, IntWritable> {

        private final IntWritable v = new IntWritable(1);
        private final Text k = new Text();

        @Override
        protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
            String[] ss = value.toString().split("\t");
            if (ss.length == 2) {
                String[] vv = ss[1].split(",");
                for (String vv1 : vv) {
                    for (String vv2 : vv) {
                        k.set(getPair(vv1, vv2));
                        context.write(k, v);
                    }
                }
            }
        }

        public String getPair(String a, String b) {
            //            if (a.compareTo(b) < 0) {
            //                return "[" + a + "," + b + "] ";
            //            } else {
            //                return "[" + b + "," + a + "] ";
            //            }

            return a + "," + b;
        }
    }

    //    static class CoocReducer extends Reducer<Text, IntWritable, Text, IntWritable> {
    //
    //        @Override
    //        protected void reduce(Text key, Iterable<IntWritable> values, Context context) throws IOException, InterruptedException {
    //            int num = 0;
    //            for (IntWritable i : values) {
    //                num += i.get();
    //            }
    //            context.write(key, new IntWritable(num));
    //        }
    //
    //    }
    @Override
    public int run(String[] strings) throws Exception {
        Configuration conf = getConf();
        Path in = new Path(conf.get("input"));
        Path out = new Path(conf.get("output"));

        Job surJob = Job.getInstance(conf);
        surJob.setJarByClass(CoocMRD.class);
        surJob.setJobName("Coor");

        surJob.setMapperClass(CoocMapper.class);
        surJob.setReducerClass(IntSumReducer.class);

        surJob.setMapOutputKeyClass(Text.class);
        surJob.setMapOutputValueClass(IntWritable.class);

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

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

        TextInputFormat.addInputPath(surJob, in);
        TextOutputFormat.setOutputPath(surJob, out);

        return surJob.waitForCompletion(true) ? 0 : 1;
    }

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