net.hubs1.mahout.cluster.CRLFSeparatedToSequenceFile.java Source code

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Here is the source code for net.hubs1.mahout.cluster.CRLFSeparatedToSequenceFile.java

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package net.hubs1.mahout.cluster;

/*
 * 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.
 */

import java.io.IOException;

import org.apache.commons.cli2.CommandLine;
import org.apache.commons.cli2.Group;
import org.apache.commons.cli2.Option;
import org.apache.commons.cli2.OptionException;
import org.apache.commons.cli2.builder.GroupBuilder;
import org.apache.commons.cli2.commandline.Parser;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.mapreduce.lib.output.SequenceFileOutputFormat;
import org.apache.hadoop.util.GenericsUtil;
import org.apache.mahout.common.CommandLineUtil;
import org.apache.mahout.common.HadoopUtil;
import org.apache.mahout.common.commandline.DefaultOptionCreator;
import org.apache.mahout.common.iterator.FileLineIterable;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import net.hubs1.mahout.cluster.CRLFInputFormat;
import net.hubs1.mahout.cluster.CRLFMapper;

/**
 * Create and run the Wikipedia Dataset Creator.
 */
public final class CRLFSeparatedToSequenceFile {

    private static final Logger log = LoggerFactory.getLogger(CRLFSeparatedToSequenceFile.class);

    private CRLFSeparatedToSequenceFile() {
    }

    /**
     * Takes in two arguments:
     * <ol>
     * <li>The input {@link org.apache.hadoop.fs.Path} where the input documents live</li>
     * <li>The output {@link org.apache.hadoop.fs.Path} where to write the classifier as a
     * {@link org.apache.hadoop.io.SequenceFile}</li>
     * </ol>
     */
    public static void main(String[] args) throws IOException {

        GroupBuilder gbuilder = new GroupBuilder();

        Option dirInputPathOpt = DefaultOptionCreator.inputOption().create();

        Option dirOutputPathOpt = DefaultOptionCreator.outputOption().create();

        Option helpOpt = DefaultOptionCreator.helpOption();

        Group group = gbuilder.withName("Options").withOption(dirInputPathOpt).withOption(dirOutputPathOpt)
                .withOption(helpOpt).create();

        Parser parser = new Parser();
        parser.setGroup(group);
        parser.setHelpOption(helpOpt);
        try {
            CommandLine cmdLine = parser.parse(args);
            if (cmdLine.hasOption(helpOpt)) {
                CommandLineUtil.printHelp(group);
                return;
            }

            String inputPath = (String) cmdLine.getValue(dirInputPathOpt);
            String outputPath = (String) cmdLine.getValue(dirOutputPathOpt);

            runJob(inputPath, outputPath);
        } catch (OptionException e) {
            log.error("Exception", e);
            CommandLineUtil.printHelp(group);
        } catch (InterruptedException e) {
            log.error("Exception", e);
            CommandLineUtil.printHelp(group);
        } catch (ClassNotFoundException e) {
            log.error("Exception", e);
            CommandLineUtil.printHelp(group);
        }
    }

    /**
     * Run the job
     * 
     * @param input
     *          the input pathname String
     * @param output
     *          the output pathname String
     */
    public static void runJob(String input, String output)
            throws IOException, InterruptedException, ClassNotFoundException {
        Configuration conf = new Configuration();

        Job job = new Job(conf);
        if (log.isInfoEnabled()) {
            log.info("Input: {} Out: {} ", new Object[] { input, output });
        }

        job.setJobName("CRLF2Sequence");
        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(Text.class);
        FileInputFormat.setInputPaths(job, new Path(input));
        Path outPath = new Path(output);
        FileOutputFormat.setOutputPath(job, outPath);
        job.setMapperClass(CRLFMapper.class);
        job.setInputFormatClass(CRLFInputFormat.class);
        job.setReducerClass(Reducer.class);
        job.setOutputFormatClass(SequenceFileOutputFormat.class);
        job.setJarByClass(CRLFSeparatedToSequenceFile.class);

        /*
         * conf.set("mapred.compress.map.output", "true"); conf.set("mapred.map.output.compression.type",
         * "BLOCK"); conf.set("mapred.output.compress", "true"); conf.set("mapred.output.compression.type",
         * "BLOCK"); conf.set("mapred.output.compression.codec", "org.apache.hadoop.io.compress.GzipCodec");
         */
        HadoopUtil.delete(conf, outPath);

        boolean succeeded = job.waitForCompletion(true);
        if (!succeeded) {
            throw new IllegalStateException("Job failed!");
        }
    }
}