Examples of org.apache.hadoop.util.PureJavaCrc32

org.apache.hadoop.util.PureJavaCrc32
A pure-java implementation of the CRC32 checksum that uses the same polynomial as the built-in native CRC32. This is to avoid the JNI overhead for certain uses of Checksumming where many small pieces of data are checksummed in succession. The current version is ~10x to 1.8x as fast as Sun's native java.util.zip.CRC32 in Java 1.6 @see java.util.zip.CRC32

  /**
   * Write this spill record to the location provided.
   */
  public void writeToFile(Path loc, JobConf job)
      throws IOException {
    writeToFile(loc, job, new PureJavaCrc32());
  }

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    } finally {
      IOUtils.closeStream(instr);
    }


    // compute crc of partial chunk from data read in the block file.
    partialCrc = new PureJavaCrc32();
    partialCrc.update(buf, 0, sizePartialChunk);
    LOG.info("Read in partial CRC chunk from disk for block " + block);


    // paranoia! verify that the pre-computed crc matches what we
    // recalculated just now

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    private final DataOutputBuffer buf;
    private final Checksum checksum;


    public Writer(DataOutputBuffer out) {
      this.buf = out;
      this.checksum = new PureJavaCrc32();
    }

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     * @param logVersion The version of the data coming from the stream.
     */
    public Reader(DataInputStream in, StreamLimiter limiter, int logVersion) {
      this.logVersion = logVersion;
      if (LayoutVersion.supports(Feature.EDITS_CHESKUM, logVersion)) {
        this.checksum = new PureJavaCrc32();
      } else {
        this.checksum = null;
      }


      if (this.checksum != null) {

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    entries = buf.asLongBuffer();
  }


  public SpillRecord(Path indexFileName, JobConf job, String expectedIndexOwner)
  throws IOException {
    this(indexFileName, job, new PureJavaCrc32(), expectedIndexOwner);
  }

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  /**
   * Write this spill record to the location provided.
   */
  public void writeToFile(Path loc, JobConf job)
      throws IOException {
    writeToFile(loc, job, new PureJavaCrc32());
  }

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                          int bufferSize,
                          short replication,
                          long blockSize,
                          Progressable progress)
      throws IOException {
      super(new PureJavaCrc32(), fs.getBytesPerSum(), 4);
      int bytesPerSum = fs.getBytesPerSum();
      this.datas = fs.getRawFileSystem().create(file, overwrite, bufferSize, 
                                         replication, blockSize, progress);
      int sumBufferSize = fs.getSumBufferSize(bytesPerSum, bufferSize);
      this.sums = fs.getRawFileSystem().create(fs.getChecksumFile(file), true,

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     */
    @SuppressWarnings("deprecation")
    public Reader(DataInputStream in, StreamLimiter limiter, int logVersion) {
      this.logVersion = logVersion;
      if (LayoutVersion.supports(Feature.EDITS_CHESKUM, logVersion)) {
        this.checksum = new PureJavaCrc32();
      } else {
        this.checksum = null;
      }


      if (this.checksum != null) {

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    } finally {
      IOUtils.closeStream(instr);
    }


    // compute crc of partial chunk from data read in the block file.
    partialCrc = new PureJavaCrc32();
    partialCrc.update(buf, 0, sizePartialChunk);
    LOG.info("Read in partial CRC chunk from disk for block " + block);


    // paranoia! verify that the pre-computed crc matches what we
    // recalculated just now

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    private final DataOutputBuffer buf;
    private final Checksum checksum;


    public Writer(DataOutputBuffer out) {
      this.buf = out;
      this.checksum = new PureJavaCrc32();
    }

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