de.hpi.fgis.hdrs.mapreduce.IndexLoader.java Source code

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Here is the source code for de.hpi.fgis.hdrs.mapreduce.IndexLoader.java

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/**
 * Copyright 2011 Daniel Hefenbrock
 *
 * 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 de.hpi.fgis.hdrs.mapreduce;

import java.io.IOException;

import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;

import de.hpi.fgis.hdrs.Triple;

public class IndexLoader extends Configured implements Tool {

    public static class Map extends Mapper<NullWritable, Triple, NullWritable, Triple> {

        public void map(NullWritable key, Triple value, Context context) throws IOException, InterruptedException {

            context.write(key, value);
        }
    }

    @Override
    public int run(String[] args) throws Exception {
        if (3 != args.length) {
            System.out.println(
                    "Usage: IndexLoader <StoreAddres> <SourceIndex> " + "<TargetIndex1>[,<TargetIndex2>...]");
            return 0;
        }

        Job job = new Job(getConf());
        job.setJarByClass(IndexLoader.class);
        job.setJobName("HDRS Index Loader");

        job.setMapOutputKeyClass(NullWritable.class);
        job.setMapOutputValueClass(TripleOutputFormat.class);

        job.setOutputKeyClass(NullWritable.class);
        job.setOutputValueClass(TripleOutputFormat.class);

        job.setMapperClass(Map.class);
        job.setNumReduceTasks(0);

        job.setInputFormatClass(TripleInputFormat.class);
        job.setOutputFormatClass(TripleOutputFormat.class);

        TripleInputFormat.setStoreAddress(job, args[0]);
        TripleInputFormat.setIndex(job, args[1]);

        TripleOutputFormat.setStoreAddress(job, args[0]);
        TripleOutputFormat.setOutputIndexes(job, args[2]);

        boolean success = job.waitForCompletion(true);
        return success ? 0 : 1;
    }

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

}