LzopFileReadWrite.java

package com.manning.hip.ch5;

import com.hadoop.compression.lzo.LzopCodec;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.*;
import org.apache.hadoop.io.IOUtils;

import java.io.*;

public class LzopFileReadWrite {

  public static void main(String... args) throws Exception {
    Configuration config = new Configuration();

    LzopCodec codec = new LzopCodec();
    codec.setConf(config);

    Path srcFile = new Path(args[0]);
    Path restoredFile = new Path(args[0] + ".restored");

    Path destFile = compress(srcFile, config);
    decompress(destFile, restoredFile, config);
  }

  public static Path compress(Path src,
                              Configuration config)
      throws IOException {
    Path destFile =
        new Path(
            src.toString() + new LzopCodec().getDefaultExtension());

    LzopCodec codec = new LzopCodec();
    codec.setConf(config);

    FileSystem hdfs = FileSystem.get(config);
    InputStream is = null;
    OutputStream os = null;
    try {
      is = hdfs.open(src);
      os = codec.createOutputStream(hdfs.create(destFile));

      IOUtils.copyBytes(is, os, config);
    } finally {
      IOUtils.closeStream(os);
      IOUtils.closeStream(is);
    }
    return destFile;
  }

  public static void decompress(Path src, Path dest,
                                Configuration config)
      throws IOException {
    LzopCodec codec = new LzopCodec();
    codec.setConf(config);

    FileSystem hdfs = FileSystem.get(config);
    InputStream is = null;
    OutputStream os = null;
    try {
      is = codec.createInputStream(hdfs.open(src));
      os = hdfs.create(dest);

      IOUtils.copyBytes(is, os, config);
    } finally {
      IOUtils.closeStream(os);
      IOUtils.closeStream(is);
    }
  }
}