com.pivotal.hawq.mapreduce.MapReduceLocalDriver.java Source code

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Here is the source code for com.pivotal.hawq.mapreduce.MapReduceLocalDriver.java

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package com.pivotal.hawq.mapreduce;

/*
 * 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.
 */

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.ToolRunner;

/**
 * A mapreduce driver to run HAWQInputFormat in local mode. Suitable for Unit Test.
 */
public final class MapReduceLocalDriver extends MapReduceDriver {

    public MapReduceLocalDriver() {
        Configuration conf = new Configuration();
        conf.set("fs.default.name", "file:///");
        conf.set("mapred.job.tracker", "local");

        setConf(conf);
    }

    @Override
    public int run(String[] args) throws Exception {
        if (args.length != 2 && args.length != 3) {
            System.err.printf("Usage: %s [generic options] <metadata_file> <output> [<mapper_classname>]\n",
                    getClass().getSimpleName());
            ToolRunner.printGenericCommandUsage(System.err);
            return -1;
        }

        String metadataFile = args[0];
        Path outputPath = new Path(args[1]);
        Class<? extends Mapper> mapperClass = (args.length == 2) ? HAWQTableMapper.class
                : (Class<? extends Mapper>) Class.forName(args[2]);

        // delete previous output
        FileSystem fs = FileSystem.getLocal(getConf());
        if (fs.exists(outputPath))
            fs.delete(outputPath, true);
        fs.close();

        Job job = new Job(getConf());
        job.setJarByClass(MapReduceLocalDriver.class);

        job.setInputFormatClass(HAWQInputFormat.class);
        HAWQInputFormat.setInput(job.getConfiguration(), metadataFile);
        FileOutputFormat.setOutputPath(job, outputPath);

        job.setMapperClass(mapperClass);
        job.setReducerClass(HAWQTableReducer.class);

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

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