BinaryFilesToHadoopSequenceFile

package com.eldadlevy.hadoop;


import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.net.URI;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.mapreduce.lib.output.SequenceFileOutputFormat;
import org.apache.hadoop.util.GenericOptionsParser;
import org.apache.log4j.Logger;


public class BinaryFilesToHadoopSequenceFile {

    private static Logger logger = Logger.getLogger(BinaryFilesToHadoopSequenceFile.class);

    public static class BinaryFilesToHadoopSequenceFileMapper extends Mapper<Object, Text, Text, BytesWritable> {

        public void map(Object key, Text value, Context context)
        throws IOException, InterruptedException {

            logger.info("map method called..");

            String uri = value.toString();
            Configuration conf = new Configuration();
            FileSystem fs = FileSystem.get(URI.create(uri), conf);
            FSDataInputStream in = null;
            try {
                in = fs.open(new Path(uri));
                java.io.ByteArrayOutputStream bout = new ByteArrayOutputStream();
                byte buffer[] = new byte[1024 * 1024];

                while( in.read(buffer, 0, buffer.length) >= 0 ) {
                    bout.write(buffer);
                }
                context.write(value, new BytesWritable(bout.toByteArray()));
            } finally {
                IOUtils.closeStream(in);
            }
        }

    }


    public static void main(String[] args) throws Exception {
        Configuration conf = new Configuration();
        String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
        if (otherArgs.length != 2) {
            System.err.println("Usage: BinaryFilesToHadoopSequenceFile <in Path for url file> <out pat for sequence file>");
            System.exit(2);
        }


        Job job = new Job(conf, "BinaryFilesToHadoopSequenceFile");
        job.setJarByClass(BinaryFilesToHadoopSequenceFile.class);
        job.setMapperClass(BinaryFilesToHadoopSequenceFileMapper.class);
        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(BytesWritable.class);
        job.setInputFormatClass(TextInputFormat.class);
        job.setOutputFormatClass(SequenceFileOutputFormat.class);

        FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
        FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));
        System.exit(job.waitForCompletion(true) ? 0 : 1);
    }


}