コード例 #1
0
  public synchronized InputStream getBlockInputStream(Block b, long seekOffset) throws IOException {

    File blockFile = getBlockFile(b);
    RandomAccessFile blockInFile = new RandomAccessFile(blockFile, "r");
    if (seekOffset > 0) {
      blockInFile.seek(seekOffset);
    }
    return new FileInputStream(blockInFile.getFD());
  }
コード例 #2
0
  /** Returns handles to the block file and its metadata file */
  public synchronized BlockInputStreams getTmpInputStreams(Block b, long blkOffset, long ckoff)
      throws IOException {

    DatanodeBlockInfo info = volumeMap.get(b);
    if (info == null) {
      throw new IOException("Block " + b + " does not exist in volumeMap.");
    }
    FSVolume v = info.getVolume();
    File blockFile = v.getTmpFile(b);
    RandomAccessFile blockInFile = new RandomAccessFile(blockFile, "r");
    if (blkOffset > 0) {
      blockInFile.seek(blkOffset);
    }
    File metaFile = getMetaFile(blockFile, b);
    RandomAccessFile metaInFile = new RandomAccessFile(metaFile, "r");
    if (ckoff > 0) {
      metaInFile.seek(ckoff);
    }
    return new BlockInputStreams(
        new FileInputStream(blockInFile.getFD()), new FileInputStream(metaInFile.getFD()));
  }