Examples of org.apache.hadoop.io.compress.bzip2.CBZip2OutputStream

Package org.apache.hadoop.io.compress.bzip2

Examples of org.apache.hadoop.io.compress.bzip2.CBZip2OutputStream

org.apache.hadoop.io.compress.bzip2.BZip2DummyCompressor

An output stream that compresses into the BZip2 format (without the file header chars) into another stream.

The compression requires large amounts of memory. Thus you should call the {@link #close() close()} method as soon as possible, to forceCBZip2OutputStream to release the allocated memory.

You can shrink the amount of allocated memory and maybe raise the compression speed by choosing a lower blocksize, which in turn may cause a lower compression ratio. You can avoid unnecessary memory allocation by avoiding using a blocksize which is bigger than the size of the input.

You can compute the memory usage for compressing by the following formula:

 <code>400k + (9 * blocksize)</code>.

To get the memory required for decompression by {@link CBZip2InputStream CBZip2InputStream} use

 <code>65k + (5 * blocksize)</code>.

Memory usage by blocksize
Blocksize	Compression memory usage	Decompression memory usage
100k	1300k	565k
200k	2200k	1065k
300k	3100k	1565k
400k	4000k	2065k
500k	4900k	2565k
600k	5800k	3065k
700k	6700k	3565k
800k	7600k	4065k
900k	8500k	4565k

For decompression CBZip2InputStream allocates less memory if the bzipped input is smaller than one block.

Instances of this class are not threadsafe.

TODO: Update to BZip2 1.0.1

    return in;
  }


  private static OutputStream newBz2OutputStream(OutputStream out) throws IOException {
    // TODO linux compatibility?
    return new CBZip2OutputStream(out);
  }

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    return in;
  }


  private static OutputStream newBz2OutputStream(OutputStream out) throws IOException {
    // TODO linux compatibility?
    return new CBZip2OutputStream(new BufferedOutputStream(out));
  }

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  public static final String VERSION = "$Header$";


  protected void process(String exepath, String[] args) throws Exception {
    BufferObjectReader in = new BufferObjectReader(getStdIn());
    BufferOutputStream out = getStdOutStream();
    CBZip2OutputStream bout = new CBZip2OutputStream(out);
    ObjectOutputStream oout = new ObjectOutputStream(bout);
    Object obj;
    try {
      while( !in.isFinished() ) {
        obj = in.readObject();
        oout.writeObject(obj);
        oout.flush();
        bout.flush();
        out.flush();
      }
      in.close();
    } catch (Exception e) {
      if(canThrowEx()) {
        throw e;
      } else {
        org.jboss.fresh.io.BufferWriter bw = new BufferWriter(getStdOut());
        PrintWriter tOut = new PrintWriter(bw);
        tOut.write(e.toString());
      }
    }
    oout.close();
    bout.close();
    out.close();
  }

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  *
  * @throws java.lang.UnsupportedOperationException
  *             Throws UnsupportedOperationException
  */
  public Compressor createCompressor() {
    return new BZip2DummyCompressor();
  }

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  *
  * @return Compressor
  */
  @Override
  public Compressor createCompressor() {
    return new BZip2DummyCompressor();
  }

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  * This functionality is currently not supported.
  *
  * @return Compressor
  */
  public Compressor createCompressor() {
    return new BZip2DummyCompressor();
  }

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   * @param conf configuration
   * @return the appropriate implementation of the bzip2 compressor.
   */
  public static Compressor getBzip2Compressor(Configuration conf) {
    return isNativeBzip2Loaded(conf)? 
      new Bzip2Compressor(conf) : new BZip2DummyCompressor();
  }

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  *
  * @throws java.lang.UnsupportedOperationException
  *             Throws UnsupportedOperationException
  */
  public Compressor createCompressor() {
    return new BZip2DummyCompressor();
  }

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  * This functionality is currently not supported.
  *
  * @return Compressor
  */
  public Compressor createCompressor() {
    return new BZip2DummyCompressor();
  }

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   * @param conf configuration
   * @return the appropriate implementation of the bzip2 compressor.
   */
  public static Compressor getBzip2Compressor(Configuration conf) {
    return isNativeBzip2Loaded(conf)? 
      new Bzip2Compressor(conf) : new BZip2DummyCompressor();
  }

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