com.mongodb.hadoop.examples.ufos.UfoSightings.java Source code

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Here is the source code for com.mongodb.hadoop.examples.ufos.UfoSightings.java

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/*
 * Copyright 2011 10gen Inc.
 *
 * 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 com.mongodb.hadoop.examples.ufos;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;

/**
 * The ufo sightings xml config object.
 */
public class UfoSightings extends Configured implements Tool {
    private static final Log LOG = LogFactory.getLog(UfoSightings.class);

    private static final boolean BACKGROUND = false;

    public int run(final String[] args) throws Exception {
        final Configuration conf = getConf();

        final Job job = new Job(conf, "ufo-sightings");

        job.setMapperClass(UfoSightingsMapper.class);
        job.setReducerClass(UfoSightingsReducer.class);
        job.setOutputFormatClass(com.mongodb.hadoop.MongoOutputFormat.class);
        job.setOutputKeyClass(org.apache.hadoop.io.Text.class);
        job.setOutputValueClass(org.apache.hadoop.io.IntWritable.class);
        job.setInputFormatClass(com.mongodb.hadoop.MongoInputFormat.class);

        final boolean verbose = true;
        try {
            if (BACKGROUND) {
                LOG.info("Setting up and running MapReduce job in background.");
                job.submit();
                return 0;
            } else {
                LOG.info("Setting up and running MapReduce job in foreground, will wait for results.  {Verbose? "
                        + verbose + "}");
                return job.waitForCompletion(true) ? 0 : 1;
            }
        } catch (final Exception e) {
            LOG.error("Exception while executing job... ", e);
            return 1;
        }
    }

    public static void main(final String[] pArgs) throws Exception {
        System.exit(ToolRunner.run(new UfoSightings(), pArgs));
    }
}