edu.cuhk.hccl.hadoop.HadoopApp.java Source code

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Here is the source code for edu.cuhk.hccl.hadoop.HadoopApp.java

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/**
 * Copyright (C) 2014 Pengfei Liu <pfliu@se.cuhk.edu.hk>
 * The Chinese University of Hong Kong.
 *
 * This file is part of aspect-opinion.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package edu.cuhk.hccl.hadoop;

import java.net.URI;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.filecache.DistributedCache;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;

import edu.cuhk.hccl.data.NounPhrase;
import edu.cuhk.hccl.data.UserItemPair;
import edu.cuhk.hccl.util.Constant;

public class HadoopApp extends Configured implements Tool {

    public static void main(String[] args) throws Exception {
        int status = ToolRunner.run(new Configuration(), new HadoopApp(), args);
        System.exit(status);
    }

    @Override
    public int run(String[] args) throws Exception {

        if (args == null || args.length < 4) {
            System.out.println("Please specify parameters: input, output, domain, num-reducers!");
            System.exit(-1);
        }

        String input = args[0];
        String output = args[1];
        String domain = args[2];
        int numReducers = Integer.parseInt(args[3]);
        float similarity = Float.parseFloat(args[4]);
        int range = Integer.parseInt(args[5]);

        Job job = new Job(new Configuration(), this.getClass().getSimpleName());

        // Must below the line of job creation
        Configuration conf = job.getConfiguration();
        // Reuse the JVM
        conf.setInt("mapred.job.reuse.jvm.num.tasks", -1);
        conf.setFloat("SIM_THRESHOLD", similarity);
        conf.setInt("SEARCH_RANGE", range);

        if (domain.equalsIgnoreCase("restaurant")) {
            conf.setStrings("ASPECTS", Constant.RESTAURANT_ASPECTS);
            job.setMapperClass(YelpMapper.class);
            job.setInputFormatClass(TextInputFormat.class);

            // args[4] is the business file to select matching business_ids to restaurant
            String busiFile = args[6];
            DistributedCache.addCacheFile(new URI(busiFile), conf);
        } else if (domain.equalsIgnoreCase("hotel")) {
            conf.setStrings("ASPECTS", Constant.TRIPADVISOR_ASPECTS);
            job.setMapperClass(TripAdvisorMapper.class);
            job.setInputFormatClass(SequenceFileInputFormat.class);
        } else {
            System.out.println("Wrong domain type!");
            System.exit(-1);
        }

        job.setJarByClass(HadoopApp.class);
        job.setReducerClass(ReviewReducer.class);
        job.setNumReduceTasks(numReducers);

        job.setOutputFormatClass(TextOutputFormat.class);
        job.setOutputKeyClass(UserItemPair.class);
        job.setOutputValueClass(NounPhrase.class);

        // Delete output if exists
        Path outputDir = new Path(output);
        FileSystem hdfs = FileSystem.get(conf);
        if (hdfs.exists(outputDir))
            hdfs.delete(outputDir, true);

        FileInputFormat.setInputPaths(job, new Path(input));
        FileOutputFormat.setOutputPath(job, new Path(output));

        job.waitForCompletion(true);
        return 0;
    }
}