com.yosanai.tutorial.hadoop.hellohadoop.WordCount.java Source code

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Here is the source code for com.yosanai.tutorial.hadoop.hellohadoop.WordCount.java

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/**
 *
 * This is the MIT License
 * http://www.opensource.org/licenses/mit-license.php
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 */
package com.yosanai.tutorial.hadoop.hellohadoop;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
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;

/**
 * @author Saravana P Shanmugam
 * 
 */
public class WordCount {

    /**
     * @param args
     */
    public static void main(String[] args) throws Exception {
        Configuration configuration = new Configuration();
        Job job = new Job(configuration);
        job.setJobName("WordCount");
        job.setJarByClass(WordCount.class);
        job.setMapperClass(WordCountMapper.class);
        job.setReducerClass(WordCountReducer.class);
        job.setMapOutputKeyClass(Text.class);
        job.setMapOutputValueClass(IntWritable.class);
        Path inputPath = new Path("wordcount/input");
        Path outputPath = new Path("wordcount/output");
        FileInputFormat.addInputPath(job, inputPath);
        FileOutputFormat.setOutputPath(job, outputPath);
        FileSystem fileSystem = FileSystem.get(outputPath.toUri(), configuration);
        if (fileSystem.exists(outputPath)) {
            fileSystem.delete(outputPath, true);
        }

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

}