com.yourcompany.hadoop.mapreduce.KoreanWordcountDriver.java Source code

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Here is the source code for com.yourcompany.hadoop.mapreduce.KoreanWordcountDriver.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 com.yourcompany.hadoop.mapreduce;

import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.ToolRunner;

import java.io.IOException;

/**
 *   ?  Wordcount MapReduce Job Driver.
 * <p/>
 * <pre>
 *     #hadoop jar JAR_FILE wordcount -input IN -output OUT -minSupport 0 -reducer 2 -exactMatch true
 *     -bigrammable false -hasOrigin false -originCNoun false
 * </pre>
 *
 * @author Edward KIM
 * @version 0.1
 * @see <a href="http://cafe.naver.com/korlucene.cafe?iframe_url=/MyCafeIntro.nhn%3Fclubid=17291730">Lucene   ?</a>
 */
public class KoreanWordcountDriver extends org.apache.hadoop.conf.Configured
        implements org.apache.hadoop.util.Tool {

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

    public int run(String[] args) throws Exception {
        Job job = new Job();
        parseArguements(args, job);

        job.setJarByClass(KoreanWordcountDriver.class);

        job.setMapperClass(KoreanWordcountMapper.class);
        job.setReducerClass(KoreanWordcountReducer.class);

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

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

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

    private void parseArguements(String[] args, Job job) throws IOException {
        for (int i = 0; i < args.length; ++i) {
            if ("-input".equals(args[i])) {
                FileInputFormat.addInputPaths(job, args[++i]);
            } else if ("-output".equals(args[i])) {
                FileOutputFormat.setOutputPath(job, new Path(args[++i]));
            } else if ("-exactMatch".equals(args[i])) {
                job.getConfiguration().set("exactMatch", args[++i]);
            } else if ("-bigrammable".equals(args[i])) {
                job.getConfiguration().set("bigrammable", args[++i]);
            } else if ("-hasOrigin".equals(args[i])) {
                job.getConfiguration().set("hasOrigin", args[++i]);
            } else if ("-originCNoun".equals(args[i])) {
                job.getConfiguration().set("originCNoun", args[++i]);
            } else if ("-reducer".equals(args[i])) {
                job.setNumReduceTasks(Integer.parseInt(args[++i]));
            } else if ("-minSupport".equals(args[i])) {
                job.getConfiguration().set("minSupport", args[++i]);
            }
        }
    }
}