org.clueweb.clueweb12.app.CountWarcRecordsNew.java Source code

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Here is the source code for org.clueweb.clueweb12.app.CountWarcRecordsNew.java

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/*
 * ClueWeb Tools: Hadoop tools for manipulating ClueWeb collections
 *
 * 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 org.clueweb.clueweb12.app;

import java.io.IOException;
import java.util.Arrays;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.GnuParser;
import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.cli.OptionBuilder;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapreduce.Counters;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.NullOutputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.apache.log4j.Logger;
import org.clueweb.clueweb12.ClueWeb12WarcRecord;
import org.clueweb.clueweb12.mapreduce.ClueWeb12InputFormat;

public class CountWarcRecordsNew extends Configured implements Tool {
    private static final Logger LOG = Logger.getLogger(CountWarcRecordsNew.class);

    private static enum Records {
        TOTAL, PAGES
    };

    private static class MyMapper extends Mapper<LongWritable, ClueWeb12WarcRecord, NullWritable, NullWritable> {
        @Override
        public void map(LongWritable key, ClueWeb12WarcRecord doc, Context context)
                throws IOException, InterruptedException {
            context.getCounter(Records.TOTAL).increment(1);

            String docid = doc.getHeaderMetadataItem("WARC-TREC-ID");
            if (docid != null) {
                context.getCounter(Records.PAGES).increment(1);
            }
        }
    }

    public CountWarcRecordsNew() {
    }

    public static final String INPUT_OPTION = "input";

    /**
     * Runs this tool.
     */
    @SuppressWarnings("static-access")
    public int run(String[] args) throws Exception {
        Options options = new Options();

        options.addOption(
                OptionBuilder.withArgName("path").hasArg().withDescription("input path").create(INPUT_OPTION));

        CommandLine cmdline;
        CommandLineParser parser = new GnuParser();
        try {
            cmdline = parser.parse(options, args);
        } catch (ParseException exp) {
            HelpFormatter formatter = new HelpFormatter();
            formatter.printHelp(this.getClass().getName(), options);
            ToolRunner.printGenericCommandUsage(System.out);
            System.err.println("Error parsing command line: " + exp.getMessage());
            return -1;
        }

        if (!cmdline.hasOption(INPUT_OPTION)) {
            HelpFormatter formatter = new HelpFormatter();
            formatter.printHelp(this.getClass().getName(), options);
            ToolRunner.printGenericCommandUsage(System.out);
            return -1;
        }

        String input = cmdline.getOptionValue(INPUT_OPTION);

        LOG.info("Tool name: " + CountWarcRecordsNew.class.getSimpleName());
        LOG.info(" - input: " + input);

        Job job = new Job(getConf(), CountWarcRecordsNew.class.getSimpleName() + ":" + input);
        job.setJarByClass(CountWarcRecordsNew.class);
        job.setNumReduceTasks(0);

        FileInputFormat.addInputPaths(job, input);

        job.setInputFormatClass(ClueWeb12InputFormat.class);
        job.setOutputFormatClass(NullOutputFormat.class);
        job.setMapperClass(MyMapper.class);

        job.waitForCompletion(true);

        Counters counters = job.getCounters();
        int numDocs = (int) counters.findCounter(Records.PAGES).getValue();
        LOG.info("Read " + numDocs + " docs.");

        return 0;
    }

    /**
     * Dispatches command-line arguments to the tool via the <code>ToolRunner</code>.
     */
    public static void main(String[] args) throws Exception {
        LOG.info("Running " + CountWarcRecordsNew.class.getCanonicalName() + " with args " + Arrays.toString(args));
        ToolRunner.run(new CountWarcRecordsNew(), args);
    }
}