com.intel.hadoop.graphbuilder.idnormalize.mapreduce.TransEdgeMR.java Source code

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Here is the source code for com.intel.hadoop.graphbuilder.idnormalize.mapreduce.TransEdgeMR.java

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/* Copyright (C) 2012 Intel Corporation.
 *     All rights reserved.
 *           
 *  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.
 *
 * For more about this software visit:
 *      http://www.01.org/GraphBuilder 
 */
package com.intel.hadoop.graphbuilder.idnormalize.mapreduce;

import java.io.IOException;

import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
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.TextInputFormat;
import org.apache.hadoop.mapred.TextOutputFormat;
import org.apache.log4j.Logger;

import com.intel.hadoop.graphbuilder.parser.FieldParser;
import com.intel.hadoop.graphbuilder.parser.GraphParser;

/**
 * This MapReduce class translate the rawIds in the edge list into normalized
 * newIds using the partitioned edgelist output from SortEdgeMR and partitioned
 * dictionary output from SortDictMR.
 * <p>
 * Input directory: list of edges. Output directory: $outputdir/
 * </p>
 * 
 */
public class TransEdgeMR {

    private static final Logger LOG = Logger.getLogger(TransEdgeMR.class);

    /**
     * @param numChunks
     *          number of partitions in the dictionary.
     * @param dictionaryPath
     *          path of the partitioned dictionary.
     * @param graphparser
     * @param vidparser
     * @param edataparser
     */
    public TransEdgeMR(int numChunks, String dictionaryPath, GraphParser graphparser, FieldParser vidparser,
            FieldParser edataparser) {
        this.numChunks = numChunks;
        this.graphparser = graphparser;
        this.vidparser = vidparser;
        this.edataparser = edataparser;
        this.dictionaryPath = dictionaryPath;
    }

    /**
     * @param inputpath
     *          path of the partitioned edge list
     * @param outputpath
     *          path of the output directory
     * @throws IOException
     */
    public void run(String inputpath, String outputpath) throws IOException {

        JobConf conf = new JobConf(TransEdgeMR.class);

        conf.setOutputKeyClass(Text.class);
        conf.setOutputValueClass(Text.class);

        conf.setMapOutputKeyClass(IntWritable.class);
        conf.setMapOutputValueClass(Text.class);

        conf.setMapperClass(TransEdgeMapper.class);
        conf.setReducerClass(TransEdgeReducer.class);

        conf.setInputFormat(TextInputFormat.class);
        conf.setOutputFormat(TextOutputFormat.class);

        conf.setInt("numChunks", numChunks);
        conf.set("GraphParser", graphparser.getClass().getName());
        conf.set("VidParser", vidparser.getClass().getName());
        conf.set("EdataParser", edataparser.getClass().getName());

        conf.set("dictionaryPath", dictionaryPath);

        FileInputFormat.setInputPaths(conf, new Path(inputpath));
        FileOutputFormat.setOutputPath(conf, new Path(outputpath));

        LOG.info("============= Job: Normalize Ids in Edges ====================");
        LOG.info("Input = " + inputpath);
        LOG.info("Output = " + outputpath);
        LOG.info("Dictionary = " + dictionaryPath);
        LOG.debug("numChunks = " + numChunks);
        LOG.debug("GraphParser = " + graphparser.getClass().getName());
        LOG.debug("VidParser = " + vidparser.getClass().getName());
        LOG.debug("EdataParser = " + edataparser.getClass().getName());
        LOG.info("===============================================================");

        JobClient.runJob(conf);

        LOG.info("========================= Done ===============================");
    }

    private int numChunks;
    GraphParser graphparser;
    FieldParser vidparser;
    FieldParser edataparser;
    private String dictionaryPath;
}