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

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Here is the source code for com.pivotal.hawq.mapreduce.MapReduceClusterDriver.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;

import java.util.Map;

/**
 * A mapreduce driver to run HAWQInputFormat in cluster mode. Suitable for Integration Test.
 */
public final class MapReduceClusterDriver extends MapReduceDriver {

    private static final String DEFAULT_HADOOP_HOME = "/usr/local/hadoop";
    private static final String HADOOP_HOME;
    static {
        Map<String, String> env = System.getenv();
        if (env.containsKey("HADOOP_HOME"))
            HADOOP_HOME = env.get("HADOOP_HOME");
        else
            HADOOP_HOME = DEFAULT_HADOOP_HOME;
    }

    public MapReduceClusterDriver() {
        Configuration conf = new Configuration();
        conf.addResource(new Path(HADOOP_HOME + "/etc/hadoop/hdfs-site.xml"));
        conf.addResource(new Path(HADOOP_HOME + "/etc/hadoop/core-site.xml"));

        setConf(conf);
    }

    @Override
    public int run(String[] args) throws Exception {
        if (args.length != 3 && args.length != 4) {
            System.err.printf("Usage: %s [generic options] <tableName> <dburl> <output> [<mapper_classname>]\n",
                    getClass().getSimpleName());
            ToolRunner.printGenericCommandUsage(System.err);
            return -1;
        }

        String tableName = args[0];
        String dbUrl = args[1];
        Path outputPath = new Path(args[2]);
        Class<? extends Mapper> mapperClass = (args.length == 3) ? HAWQTableMapper.class
                : (Class<? extends Mapper>) Class.forName(args[3]);

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

        Job job = new Job(getConf(), "job_read_" + tableName);
        job.setJarByClass(MapReduceClusterDriver.class);

        job.setInputFormatClass(HAWQInputFormat.class);
        HAWQInputFormat.setInput(job.getConfiguration(), dbUrl, null, null, tableName);
        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;
    }
}