edu.indiana.d2i.htrc.corpus.retrieve.RetrieveRawCorpusDriver.java Source code

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Here is the source code for edu.indiana.d2i.htrc.corpus.retrieve.RetrieveRawCorpusDriver.java

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/*
#
# Copyright 2007 The Trustees of Indiana University
#
# 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 edu.indiana.d2i.htrc.corpus.retrieve;

import java.io.FileInputStream;
import java.util.Properties;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.SequenceFile.CompressionType;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.compress.DefaultCodec;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.NLineInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.mapreduce.lib.output.SequenceFileOutputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;

import edu.indiana.d2i.htrc.Constants;
import edu.indiana.d2i.htrc.corpus.TextArrayWritable;

public class RetrieveRawCorpusDriver extends Configured implements Tool {

    @Override
    public int run(String[] args) throws Exception {
        // TODO Auto-generated method stub

        /**
         * Specify the # of reducers through -D
         * mapred.reduce.tasks=<numOfReducers> in hadoop command line. Specify
         * using compression through -D user.args.compression=true
         */
        if (args.length != 3) {
            System.err.printf(
                    "Usage: %s [generic options] </path/to/input/directory> </path/to/output/directory> </path/to/property/file>\n",
                    getClass().getSimpleName());
            ToolRunner.printGenericCommandUsage(System.err);
            return -1;
        }

        Configuration conf = getConf();

        Properties prop = new Properties();

        prop.load(new FileInputStream(args[2]));

        // set configuration parameters

        // data api related parameters
        conf.set(Constants.DATA_API_EPR, prop.getProperty(Constants.DATA_API_EPR));
        conf.set(Constants.DATA_API_CONCAT, prop.getProperty(Constants.DATA_API_CONCAT));
        conf.set(Constants.DATA_API_SELFSIGN, prop.getProperty(Constants.DATA_API_SELFSIGN));
        conf.set(Constants.DATA_API_DELIMITER, prop.getProperty(Constants.DATA_API_DELIMITER));
        conf.set(Constants.DATA_API_VOL_PREFIX, prop.getProperty(Constants.DATA_API_VOL_PREFIX));
        conf.set(Constants.DATA_API_PAGE_PREFIX, prop.getProperty(Constants.DATA_API_PAGE_PREFIX));
        conf.set(Constants.DATA_API_REQ_SIZE, prop.getProperty(Constants.DATA_API_REQ_SIZE));

        // oauth2 related parameters
        conf.set(Constants.OAUTH2_EPR, prop.getProperty(Constants.OAUTH2_EPR));
        conf.set(Constants.OAUTH2_USER_NAME, prop.getProperty(Constants.OAUTH2_USER_NAME));
        conf.set(Constants.OAUTH2_USER_PASSWORD, prop.getProperty(Constants.OAUTH2_USER_PASSWORD));

        // set # of lines (volumes in our case) to be processed by one map task
        conf.set("mapreduce.input.lineinputformat.linespermap", prop.getProperty(Constants.NUM_VOLUMES_PER_MAPPER));

        Job job = new Job(conf, "HTRC Retrieving Raw Corpus");

        FileInputFormat.addInputPath(job, new Path(args[0]));
        FileOutputFormat.setOutputPath(job, new Path(args[1]));

        job.setJarByClass(RetrieveRawCorpusDriver.class);
        job.setMapperClass(RetrieveRawCorpusMapper.class);
        job.setReducerClass(RetrieveRawCorpusReducer.class);

        if (conf.getBoolean("user.args.compression", false)) {
            /* use compression */
            SequenceFileOutputFormat.setCompressOutput(job, true);
            SequenceFileOutputFormat.setOutputCompressionType(job, CompressionType.BLOCK);
            SequenceFileOutputFormat.setOutputCompressorClass(job, DefaultCodec.class);
        }

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

        job.setInputFormatClass(NLineInputFormat.class);
        job.setOutputFormatClass(SequenceFileOutputFormat.class);

        return job.waitForCompletion(true) ? 0 : 1;

    }

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

}