clustering.tf_idf.TermCntDriver.java Source code

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Here is the source code for clustering.tf_idf.TermCntDriver.java

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/*
 * 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 clustering.tf_idf;

import org.apache.hadoop.conf.Configuration;
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.input.KeyValueTextInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;

import static clustering.Utils.MapReduceUtils.initConf;

/**
 * Step 1, calculate term count of each document.
 *
 * @author edwardlol
 *         Created by edwardlol on 17-4-24.
 */
public class TermCntDriver extends Configured implements Tool {
    //~  Methods ---------------------------------------------------------------

    @Override
    public int run(String[] args) throws Exception {
        Job job = configJob(args);
        return job.waitForCompletion(true) ? 0 : 1;
    }

    Job configJob(String[] args) throws Exception {
        if (args.length < 2) {
            System.err.printf("usage: %s simhash_result_dir step_1_output_dir\n", getClass().getSimpleName());
            System.exit(1);
        }

        Configuration conf = getConf();
        conf = initConf(conf);

        Job job = Job.getInstance(conf, "tf idf step1 job");
        job.setJarByClass(TermCntDriver.class);

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

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

        job.setCombinerClass(TermCountReducer.class);

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

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

        return job;
    }

    //~  Entrance --------------------------------------------------------------

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

// End TermCntDriver.java