io.covert.dns.filtering.FilterJob.java Source code

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Here is the source code for io.covert.dns.filtering.FilterJob.java

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/*
 * 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.
 */
package io.covert.dns.filtering;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.JobClient;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.SequenceFileOutputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;

public class FilterJob extends Configured implements Tool {

    private static void usage(String msg) {
        System.err.println(
                "Usage: hadoop jar JARFILE.jar " + FilterJob.class.getName() + " <filter> <inDir> <outDir>");
        System.err.println("    filter - JEXL filter expression");
        System.err.println("    inDir  - HDFS input dir");
        System.err.println("    outDir - HDFS output dir");
        System.exit(-1);
    }

    @Override
    public int run(String[] args) throws Exception {

        if (args.length != 3) {
            usage("");
        }

        String filter = args[0];
        String inDir = args[1];
        String outDir = args[2];

        Configuration conf = getConf();
        conf.set(FilterMapper.FILTER_JEXL_EXPRESSION, filter);

        Job job = new Job(conf);
        job.setJobName(FilterJob.class.getSimpleName() + ": inDir=" + inDir + ", outDir=" + outDir + ", filter=["
                + filter + "]");
        job.setJarByClass(getClass());

        job.setMapperClass(FilterMapper.class);
        job.setReducerClass(Reducer.class); // Identity Reduce...
        job.setNumReduceTasks(new JobClient(new JobConf(conf)).getClusterStatus().getTaskTrackers());

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

        job.setInputFormatClass(SequenceFileInputFormat.class);
        FileInputFormat.setInputPaths(job, new Path(inDir));

        job.setOutputFormatClass(SequenceFileOutputFormat.class);
        SequenceFileOutputFormat.setOutputPath(job, new Path(outDir));
        SequenceFileOutputFormat.setCompressOutput(job, true);
        job.submit();

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

    public static void main(String[] args) throws Exception {
        ToolRunner.run(new FilterJob(), args);
    }
}