com.app.hadoopexample.MaxTemperatureDriver.java Source code

Introduction

Here is the source code for com.app.hadoopexample.MaxTemperatureDriver.java

Source

package com.app.hadoopexample;

import org.apache.hadoop.conf.Configured;
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.Tool;
import org.apache.hadoop.util.ToolRunner;
/*This class is responsible for running map reduce job*/

public class MaxTemperatureDriver extends Configured implements Tool {

    public int run(String[] arg) throws Exception

    {
        String[] args = { "C:/Hadoop/input/LICENSE.txt", "C:/Hadoop/output/LICENSE.txt" };
        if (args.length != 2) {

            System.err.println("Usage: MaxTemperatureDriver <input path> <outputpath>");

            System.exit(-1);

        }

        Job job = new Job();

        job.setJarByClass(MaxTemperatureDriver.class);

        job.setJobName("Max Temperature");

        FileInputFormat.addInputPath(job, new Path(args[0]));

        FileOutputFormat.setOutputPath(job, new Path(args[1]));

        job.setMapperClass(MaxTemperatureMapper.class);

        job.setReducerClass(MaxTemperatureReducer.class);

        job.setOutputKeyClass(Text.class);

        job.setOutputValueClass(IntWritable.class);

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

        boolean success = job.waitForCompletion(true);

        return success ? 0 : 1;

    }

    public static void main(String[] args) throws Exception {

        MaxTemperatureDriver driver = new MaxTemperatureDriver();

        int exitCode = ToolRunner.run(driver, args);

        System.exit(exitCode);

    }

}