ivory.ptc.driver.XMLFormatQueries.java Source code

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Here is the source code for ivory.ptc.driver.XMLFormatQueries.java

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/**
 * Ivory: A Hadoop toolkit for Web-scale information retrieval
 * 
 * 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 ivory.ptc.driver;

import ivory.ptc.data.PseudoJudgments;
import ivory.ptc.data.PseudoQuery;

import java.io.IOException;
import java.util.Iterator;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.FileInputFormat;
import org.apache.hadoop.mapred.FileOutputFormat;
import org.apache.hadoop.mapred.JobClient;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.MapReduceBase;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reducer;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.mapred.SequenceFileInputFormat;
import org.apache.hadoop.mapred.TextOutputFormat;
import org.apache.hadoop.mapred.lib.IdentityMapper;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;

/**
 * Driver that formats the pseudo queries and outputs an XML file
 * that can be used directly for training.
 *
 * @author Nima Asadi
 */
@SuppressWarnings("deprecation")
public class XMLFormatQueries extends Configured implements Tool {
    private static final Logger LOG = Logger.getLogger(XMLFormatQueries.class);
    static {
        LOG.setLevel(Level.INFO);
    }

    public static class MyReducer extends MapReduceBase
            implements Reducer<PseudoQuery, PseudoJudgments, Text, Text> {
        private static final Text keyOut = new Text();
        private static final Text valueOut = new Text("");
        private static OutputCollector<Text, Text> outputCollector;
        private static boolean firstTime = true;
        private static int id = 1;

        @Override
        public void reduce(PseudoQuery key, Iterator<PseudoJudgments> values, OutputCollector<Text, Text> output,
                Reporter reporter) throws IOException {
            if (firstTime) {
                outputCollector = output;
                keyOut.set("<parameters>");
                output.collect(keyOut, valueOut);
                firstTime = false;
            }
            keyOut.set("<query id=\"" + id + "\">" + key.getQuery() + "</query>");
            output.collect(keyOut, valueOut);
            id++;
        }

        public void close() throws IOException {
            keyOut.set("</parameters>");
            if (outputCollector != null) {
                outputCollector.collect(keyOut, valueOut);
            }
        }
    }

    private static int printUsage() {
        System.out.println("usage: [input-path] [output-path]");
        ToolRunner.printGenericCommandUsage(System.out);
        return -1;
    }

    @Override
    public int run(String[] args) throws Exception {
        if (args.length != 2) {
            printUsage();
            return -1;
        }

        JobConf conf = new JobConf(getConf(), XMLFormatQueries.class);
        // Command line arguments
        String inPath = args[0];
        String outPath = args[1];
        Path inputPath = new Path(inPath);
        Path outputPath = new Path(outPath);
        int mapTasks = 1;
        int reduceTasks = 1;

        conf.setJobName("FormatPseudoQueries");
        conf.setNumMapTasks(mapTasks);
        conf.setNumReduceTasks(reduceTasks);
        conf.set("mapred.child.java.opts", "-Xmx2048m");
        FileSystem.get(conf).delete(outputPath);
        FileInputFormat.setInputPaths(conf, inputPath);
        FileOutputFormat.setOutputPath(conf, outputPath);
        conf.setInputFormat(SequenceFileInputFormat.class);
        conf.setOutputFormat(TextOutputFormat.class);
        conf.setMapOutputKeyClass(PseudoQuery.class);
        conf.setMapOutputValueClass(PseudoJudgments.class);
        conf.setOutputKeyClass(Text.class);
        conf.setOutputValueClass(Text.class);
        conf.setMapperClass(IdentityMapper.class);
        conf.setReducerClass(MyReducer.class);
        JobClient.runJob(conf);
        return 0;
    }

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