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

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Here is the source code for org.cloudata.examples.web.DocFreqJob.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.client.CTable;
import org.cloudata.core.common.conf.CloudataConf;
import org.cloudata.core.parallel.hadoop.AbstractTabletInputFormat;
import org.cloudata.core.tablet.TableSchema;

public class DocFreqJob {
    public static final Log LOG = LogFactory.getLog(TermWeightJob.class.getName());

    public void exec(String[] options) throws Exception {
        if (options.length < 1) {
            System.out.println("Usage: java DocFreqJob <num of repeats> docFreq [#reduce]");
            System.exit(0);
        }

        JobConf jobConf = new JobConf(DocFreqJob.class);

        JobClient jobClinet = new JobClient(jobConf);
        int maxReduce = jobClinet.getClusterStatus().getMaxReduceTasks() * 2;
        if (options.length > 0) {
            maxReduce = Integer.parseInt(options[0]);
        }

        CloudataConf nconf = new CloudataConf();
        if (!CTable.existsTable(nconf, TermUploadJob.TERM_TABLE)) {
            TableSchema temrTableInfo = new TableSchema(TermUploadJob.TERM_TABLE, "Test",
                    TermUploadJob.TERM_TABLE_COLUMNS);
            CTable.createTable(nconf, temrTableInfo);
        }
        Path tempOutputPath = new Path("DocFreqJob_" + System.currentTimeMillis());

        jobConf.setJobName("DocFreqJob" + "(" + new Date() + ")");

        //<MAP>
        jobConf.setMapperClass(DocFreqMap.class);
        jobConf.setInputFormat(AbstractTabletInputFormat.class);
        jobConf.set(AbstractTabletInputFormat.INPUT_TABLE, WebTableJob.WEB_TABLE);
        jobConf.set(AbstractTabletInputFormat.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(DocFreqReduce.class);
        jobConf.setOutputKeyClass(Text.class);
        jobConf.setOutputValueClass(Text.class);
        FileOutputFormat.setOutputPath(jobConf, tempOutputPath);
        jobConf.setNumReduceTasks(maxReduce);
        //</REDUCE>

        //Run Job
        JobClient.runJob(jobConf);

        //    //delete temp output path
        FileSystem fs = FileSystem.get(jobConf);
        fs.delete(tempOutputPath, true);
    }
}