com.jbw.recommendsystem.filter.FilterMRD.java Source code

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Here is the source code for com.jbw.recommendsystem.filter.FilterMRD.java

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package com.jbw.recommendsystem.filter;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
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.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.MultipleInputs;
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 target/RecommendSystem-0.jar com.jbw.recommendsystem.filter.FilterMRD -Drin=/user/jiabw/out/rs/relation_1/part-r-00000 -Dain=/user/jiabw/out/rs/add_1/part-r-00000 -Dout=/user/jiabw/out/rs/out_1
/**
 *
 * @author alvin
 */
public class FilterMRD extends Configured implements Tool {

    static class RelationMapper extends Mapper<LongWritable, Text, Text, Text> {

        @Override
        protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
            String ss[] = value.toString().split("\t");
            if (ss != null && ss.length == 2) {
                context.write(new Text(ss[0]), new Text(ss[1]));
            }
        }

    }

    static class AddMapper extends Mapper<LongWritable, Text, Text, Text> {

        @Override
        protected void map(LongWritable key, Text value, Mapper.Context context)
                throws IOException, InterruptedException {
            String ss[] = value.toString().split("\t");
            if (ss != null && ss.length == 2) {
                context.write(new Text(ss[0]), new Text(ss[1]));
            }
        }

    }

    static class FilterReducer extends Reducer<Text, Text, Text, Text> {

        @Override
        protected void reduce(Text key, Iterable<Text> values, Context context)
                throws IOException, InterruptedException {
            Map<String, String> ll1 = new HashMap<>();

            List<String> ll2 = new ArrayList<>();
            for (Text t : values) {
                String s = t.toString().trim();
                if (s.startsWith("[")) {
                    s = s.substring(1, s.length() - 1);
                    String ss[] = s.split(",");
                    for (String st : ss) {
                        String sa[] = st.split(":");
                        ll1.put(sa[0].trim(), sa[1]);
                    }
                } else {
                    String ss[] = s.split(",");
                    ll2.addAll(Arrays.asList(ss));
                }
            }

            for (String ssl : ll2) {
                if (ll1.containsKey(ssl.trim())) {
                    ll1.remove(ssl.trim());
                }
            }
            for (String sr : ll1.keySet()) {
                context.write(key, new Text(sr + ":" + ll1.get(sr)));
            }
            // context.write(key, new Text(ll1.toString()));
        }

    }

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

        Job job = Job.getInstance(conf);
        job.setJobName("666");
        job.setJarByClass(FilterMRD.class);

        MultipleInputs.addInputPath(job, rPath, TextInputFormat.class, RelationMapper.class);
        MultipleInputs.addInputPath(job, aPath, TextInputFormat.class, AddMapper.class);
        job.setMapOutputKeyClass(Text.class);

        job.setReducerClass(FilterReducer.class);
        job.setOutputFormatClass(TextOutputFormat.class);
        TextOutputFormat.setOutputPath(job, out);

        job.setOutputKeyClass(Text.class);

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

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