com.test.hadoop.unoExample.CardDriver.java Source code

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Here is the source code for com.test.hadoop.unoExample.CardDriver.java

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package com.test.hadoop.unoExample;

/**
 * Copyright 2013 Jesse Anderson
 * 
 * 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.
 */

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;

public class CardDriver extends Configured implements Tool {
    //https://blog.cloudera.com/blog/2013/08/how-to-use-eclipse-with-mapreduce-in-clouderas-quickstart-vm/
    @Override
    public int run(String[] args) throws Exception {
        String input, output;
        if (args.length == 2) {
            input = args[0];
            output = args[1];
        } else {
            System.err.println("Incorrect number of arguments.  Expected: input output");
            return -1;
        }

        Job job = new Job(getConf());
        job.setJarByClass(CardDriver.class);
        job.setJobName(this.getClass().getName());

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

        job.setMapperClass(CardMapper.class);
        job.setReducerClass(CardTotalReducer.class);

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

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

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

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