com.marklogic.mapreduce.test.MultithreadedZipContentLoader Maven / Gradle / Ivy

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MarkLogic Connector for Hadoop MapReduce
There is a newer version: 2.3.4.2
package com.marklogic.mapreduce.test;

import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

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.Text;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.JobContext;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.FileSplit;
import org.apache.hadoop.util.GenericOptionsParser;

import org.apache.hadoop.mapreduce.lib.map.MultithreadedMapper;

import com.marklogic.mapreduce.ContentOutputFormat;
import com.marklogic.mapreduce.DocumentURI;

public class MultithreadedZipContentLoader {
    public static class ZipContentMapper 
    extends Mapper {
        
        private DocumentURI uri = new DocumentURI();
        
        public void map(Text fileName, Text fileContent, Context context) 
        throws IOException, InterruptedException {
            uri.setUri(fileName.toString());
            context.write(uri, fileContent);
        }
    }
    
    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: MultithreadedZipContentLoader configFile inputDir threadCount");
            System.exit(2);
        }
        
        Job job = Job.getInstance(conf);
        job.setJarByClass(MultithreadedZipContentLoader.class);
        job.setInputFormatClass(ZipContentInputFormat.class);
        job.setMapperClass(MultithreadedMapper.class);
        MultithreadedMapper.setMapperClass(job, ZipContentMapper.class);
        MultithreadedMapper.setNumberOfThreads(job, Integer.parseInt(args[2]));
        job.setMapOutputKeyClass(DocumentURI.class);
        job.setMapOutputValueClass(Text.class);
        job.setOutputFormatClass(ContentOutputFormat.class);
        
        ZipContentInputFormat.setInputPaths(job, new Path(otherArgs[1]));

        conf = job.getConfiguration();
        conf.addResource(otherArgs[0]);
         
        System.exit(job.waitForCompletion(true) ? 0 : 1);
    }
}

class ZipContentInputFormat extends FileInputFormat {

    @Override
    protected boolean isSplitable(JobContext context, Path filename) {
        return false;
    }
    
    @Override
    public RecordReader createRecordReader(InputSplit split,
            TaskAttemptContext context) throws IOException, InterruptedException {
        return new ZipContentReader();
    }
    
}

class ZipContentReader extends RecordReader {

    private Text key = new Text();
    private Text value = new Text();
    private ZipInputStream zipIn;
    private byte[] buf = new byte[65536];
    private boolean hasNext = true;
    
    @Override
    public void close() throws IOException {
        if (zipIn != null) {
            zipIn.close();
        }
    }

    @Override
    public Text getCurrentKey() throws IOException, InterruptedException {
        return key;
    }

    @Override
    public Text getCurrentValue() throws IOException, InterruptedException {
        return value;
    }

    @Override
    public float getProgress() throws IOException, InterruptedException {
        return hasNext ? 0 : 1;
    }

    @Override
    public void initialize(InputSplit inSplit, TaskAttemptContext context)
            throws IOException, InterruptedException {
        Path file = ((FileSplit)inSplit).getPath();
        FileSystem fs = file.getFileSystem(context.getConfiguration());
        FSDataInputStream fileIn = fs.open(file);
        zipIn = new ZipInputStream(fileIn);
    }

    @Override
    public boolean nextKeyValue() throws IOException, InterruptedException {
        if (zipIn != null) {
            ZipEntry zipEntry;
            while ((zipEntry = zipIn.getNextEntry()) != null) {
                if (zipEntry != null) {
                    key.set(zipEntry.getName());
                    StringBuilder entry = new StringBuilder();
                    long size;
                    while ((size = zipIn.read(buf, 0, buf.length)) != -1) {
                        entry.append(new String(buf, 0, (int) size));
                    }
                    value.set(entry.toString());
                    return true;
                }
            }
            hasNext = false;
            return false;
        }
        hasNext = false;
        return false;
    }
    
}