org.cloudata.examples.web.TermWeightJobOnline.java Source code

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Here is the source code for org.cloudata.examples.web.TermWeightJobOnline.java

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/**
 * 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.
 */
package org.cloudata.examples.web;

import java.util.Date;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.FileOutputFormat;
import org.apache.hadoop.mapred.JobClient;
import org.apache.hadoop.mapred.JobConf;
import org.cloudata.core.parallel.hadoop.DefaultTabletInputFormat;

/**
 * W = ( tf/(2.0 * ((1-0.75) + 0.75*(0.75*d-length/avg-d-length))) + tf) * log((N-n+0.5)/(n+0.5) )
 * ?  ?  
 *  . sum of ducument length
 *  . number of documents
 * ? Term?  ?  
 * @author babokim
 *
 */
public class TermWeightJobOnline {
    public static final Log LOG = LogFactory.getLog(TermWeightJobOnline.class.getName());

    public void exec(String[] options) throws Exception {
        if (options.length < 1) {
            System.out.println("Usage: java TermWeightJobOnline <num of repeats> termWeightOnline [noGlobal]");
            System.exit(0);
        }
        if (options.length == 1 || !options[1].equals("noGlobal")) {
            TermGlobalJob termGlobalJob = new TermGlobalJob();
            termGlobalJob.exec();
        }
        Path outputPath = new Path("TermWeightJobOnline_" + System.currentTimeMillis());

        JobConf jobConf = new JobConf(TermWeightJobOnline.class);
        jobConf.setJobName("TermWeightJobOnline" + "(" + new Date() + ")");

        //<MAP>
        jobConf.setMapperClass(TermWeightMap.class);
        jobConf.setInputFormat(DefaultTabletInputFormat.class);
        jobConf.set(DefaultTabletInputFormat.INPUT_TABLE, WebTableJob.WEB_TABLE);
        jobConf.set(DefaultTabletInputFormat.INPUT_COLUMN_LIST,
                WebTableJob.WEB_TABLE_COLUMNS[1] + "," + WebTableJob.WEB_TABLE_COLUMNS[2]);
        jobConf.setMapOutputKeyClass(Text.class);
        jobConf.setMapOutputValueClass(Text.class);
        //    jobConf.setMaxMapAttempts(0);
        //</MAP>

        //<REDUCE>
        jobConf.setReducerClass(TermWeightReduceOnline.class);
        jobConf.setOutputKeyClass(Text.class);
        jobConf.setOutputValueClass(Text.class);
        FileOutputFormat.setOutputPath(jobConf, outputPath);
        //jobConf.setMaxReduceAttempts(0);
        JobClient jobClinet = new JobClient(jobConf);
        int maxReduce = jobClinet.getClusterStatus().getMaxReduceTasks();

        jobConf.setNumReduceTasks(maxReduce);
        //</REDUCE>

        //Run Job
        try {
            JobClient.runJob(jobConf);
        } finally {
            //delete temp output path
            FileSystem fs = FileSystem.get(jobConf);
            fs.delete(outputPath, true);
        }
    }
}