Examples of org.apache.hadoop.io.compress.CompressionCodec

org.apache.hadoop.io.compress.CompressionCodec
This class encapsulates a streaming compression/decompression pair. @author Owen O'Malley

        int segments = 0;
        int currentFile = 0;
        boolean atEof = (currentFile >= inFiles.length);
        boolean isCompressed = false;
        boolean isBlockCompressed = false;
        CompressionCodec codec = null;
        segmentLengths.clear();
        if (atEof) {
          return 0;
        }

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      fs.mkdirs(outputPath);
    }


    Path file = getDefaultWorkFile(task, "");


    CompressionCodec codec = null;
    if (getCompressOutput(task)) {
      Class<?> codecClass = getOutputCompressorClass(task, DefaultCodec.class);
      codec = (CompressionCodec) ReflectionUtils.newInstance(codecClass, task.getConfiguration());
    }

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    return new HdfsDirectory(configuration, directoryPath);
  }


  protected CompressionCodec getInstance(String compressionClass) throws IOException {
    try {
      CompressionCodec codec = (CompressionCodec) Class.forName(compressionClass).newInstance();
      if (codec instanceof Configurable) {
        Configurable configurable = (Configurable) codec;
        configurable.setConf(_configuration);
      }
      return codec;

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    FileSystem fs = FileSystem.get(tpch.getTestingCluster().getConfiguration());
    assertTrue(fs.exists(desc.getPath()));
    CompressionCodecFactory factory = new CompressionCodecFactory(tpch.getTestingCluster().getConfiguration());


    for (FileStatus file : fs.listStatus(desc.getPath())){
      CompressionCodec codec = factory.getCodec(file.getPath());
      assertTrue(codec instanceof DeflateCodec);
    }
  }

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    assertTrue(fs.exists(path));
    assertEquals(1, fs.listStatus(path).length);


    CompressionCodecFactory factory = new CompressionCodecFactory(tpch.getTestingCluster().getConfiguration());
    for (FileStatus file : fs.listStatus(path)){
      CompressionCodec codec = factory.getCodec(file.getPath());
      assertTrue(codec instanceof DeflateCodec);
    }
  }

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   * Test using the gzip codec for reading
   */
  @Test(timeout=10000)
  public void testGzip() throws IOException {
    JobConf job = new JobConf(defaultConf);
    CompressionCodec gzip = new GzipCodec();
    ReflectionUtils.setConf(gzip, job);
    localFs.delete(workDir, true);
    writeFile(localFs, new Path(workDir, "part1.txt.gz"), gzip,
              "the quick\nbrown\nfox jumped\nover\n the lazy\n dog\n");
    writeFile(localFs, new Path(workDir, "part2.txt.gz"), gzip,

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    // open the file and seek to the start of the split
    final FileSystem fs = file.getFileSystem(job);
    fileIn = fs.open(file);
    
    CompressionCodec codec = new CompressionCodecFactory(job).getCodec(file);
    if (null!=codec) {
      isCompressedInput = true;  
      decompressor = CodecPool.getDecompressor(codec);
      if (codec instanceof SplittableCompressionCodec) {
        final SplitCompressionInputStream cIn =
          ((SplittableCompressionCodec)codec).createInputStream(
            fileIn, decompressor, start, end,
            SplittableCompressionCodec.READ_MODE.BYBLOCK);
        in = new CompressedSplitLineReader(cIn, job,
            this.recordDelimiterBytes);
        start = cIn.getAdjustedStart();
        end = cIn.getAdjustedEnd();
        filePosition = cIn;
      } else {
        in = new SplitLineReader(codec.createInputStream(fileIn,
            decompressor), job, this.recordDelimiterBytes);
        filePosition = fileIn;
      }
    } else {
      fileIn.seek(start);

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  public static OutputStream createCompressedStream(JobConf jc, OutputStream out,
      boolean isCompressed) throws IOException {
    if (isCompressed) {
      Class<? extends CompressionCodec> codecClass = FileOutputFormat.getOutputCompressorClass(jc,
          DefaultCodec.class);
      CompressionCodec codec = (CompressionCodec) ReflectionUtils.newInstance(codecClass, jc);
      return codec.createOutputStream(out);
    } else {
      return (out);
    }
  }

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    if (!isCompressed) {
      return "";
    } else {
      Class<? extends CompressionCodec> codecClass = FileOutputFormat.getOutputCompressorClass(jc,
          DefaultCodec.class);
      CompressionCodec codec = (CompressionCodec) ReflectionUtils.newInstance(codecClass, jc);
      return codec.getDefaultExtension();
    }
  }

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   *          Java Class for value
   * @return output stream over the created sequencefile
   */
  public static SequenceFile.Writer createSequenceWriter(JobConf jc, FileSystem fs, Path file,
      Class<?> keyClass, Class<?> valClass, boolean isCompressed) throws IOException {
    CompressionCodec codec = null;
    CompressionType compressionType = CompressionType.NONE;
    Class codecClass = null;
    if (isCompressed) {
      compressionType = SequenceFileOutputFormat.getOutputCompressionType(jc);
      codecClass = FileOutputFormat.getOutputCompressorClass(jc, DefaultCodec.class);

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