MapReduce.LanguageCount.java Source code

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Here is the source code for MapReduce.LanguageCount.java

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/*
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package MapReduce;

import Helper.KeyValueTuple;
import Utils.TweetUtils;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.SortedSet;
import java.util.TreeSet;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.hadoop.hbase.mapreduce.TableMapReduceUtil;
import org.apache.hadoop.hbase.mapreduce.TableMapper;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
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.output.FileOutputFormat;

/**
 *
 * @author kedarvdm
 */
public class LanguageCount {

    public static class MapClass extends TableMapper<Text, LongWritable> {

        private final static LongWritable one = new LongWritable(1);
        private KeyValueTuple kvt = new KeyValueTuple();

        public void map(ImmutableBytesWritable rowKey, Result columns, Mapper.Context context)
                throws IOException, InterruptedException {
            try {
                String languagecode = new String(
                        columns.getValue(Bytes.toBytes("info"), Bytes.toBytes("languagecode")), "UTF-8").trim();
                context.write(new Text(languagecode), one);
            } catch (Exception ex) {
            }
        }
    }

    public static class ReducerClass extends Reducer<Text, LongWritable, Text, LongWritable> {

        private SortedSet<KeyValueTuple> languages = new TreeSet<>();

        public void reduce(Text key, Iterable<LongWritable> values, Context context)
                throws IOException, InterruptedException {
            long total = 0;
            for (LongWritable value : values) {
                total += value.get();
            }
            context.write(key, new LongWritable(total));
            KeyValueTuple kvt = new KeyValueTuple();
            kvt.setKey(key.toString());
            kvt.setValue(total);
            languages.add(kvt);
        }

        @Override
        protected void cleanup(Context context) throws IOException, InterruptedException {
            int i = 0;
            String filename = TweetUtils.OUTPUT_PREFIX + "LanguageCount/LanguageCount.csv";
            ArrayList<KeyValueTuple> popularlanguages = new ArrayList<>();
            for (KeyValueTuple kvt : languages) {
                popularlanguages.add(kvt);

            }
            CSVUtils.CSVUtils.createCSVLanguageAsterPlot(popularlanguages, "label,order,score,weight,color,count",
                    filename);
        }
    }

    public static void main(String[] args) throws Exception {
        Configuration conf = new HBaseConfiguration();
        conf.addResource(TweetUtils.HBASE_CONF);
        Job job = Job.getInstance(conf, "Language Count");
        job.setJarByClass(LanguageCount.class);

        Scan sc = new Scan();
        sc.setCaching(500);
        sc.setCacheBlocks(false);

        TableMapReduceUtil.initTableMapperJob("twitteruser", // input table
                sc, // Scan instance to control CF and attribute selection
                MapClass.class, // mapper class
                Text.class, // mapper output key
                LongWritable.class, // mapper output value
                job);

        job.setMapperClass(MapClass.class);
        job.setReducerClass(ReducerClass.class);
        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(LongWritable.class);

        String dest = TweetUtils.OUTPUT_PREFIX + "LanguageCount";
        if (args.length > 0) {
            dest = args[0];
        }
        File destination = new File(dest);
        FileUtil.fullyDelete(destination);
        FileOutputFormat.setOutputPath(job, new Path(dest));
        System.exit(job.waitForCompletion(true) ? 0 : 1);
    }
}