コード例 #1
0
 /** {@inheritDoc} */
 public void validateBlockMetadata(Block b) 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 tmp = v.getTmpFile(b);
   File f = getFile(b);
   if (f == null) {
     f = tmp;
   }
   if (f == null) {
     throw new IOException("Block " + b + " does not exist on disk.");
   }
   if (!f.exists()) {
     throw new IOException("Block " + b + " block file " + f + " does not exist on disk.");
   }
   if (b.getNumBytes() != f.length()) {
     throw new IOException(
         "Block "
             + b
             + " length is "
             + b.getNumBytes()
             + " does not match block file length "
             + f.length());
   }
   File meta = getMetaFile(f, b);
   if (meta == null) {
     throw new IOException("Block " + b + " metafile does not exist.");
   }
   if (!meta.exists()) {
     throw new IOException("Block " + b + " metafile " + meta + " does not exist on disk.");
   }
   if (meta.length() == 0) {
     throw new IOException("Block " + b + " metafile " + meta + " is empty.");
   }
   long stamp = parseGenerationStamp(f, meta);
   if (stamp != b.getGenerationStamp()) {
     throw new IOException(
         "Block "
             + b
             + " genstamp is "
             + b.getGenerationStamp()
             + " does not match meta file stamp "
             + stamp);
   }
 }
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()));
  }
コード例 #3
0
 /** Sets the offset in the block to which the the next write will write data to. */
 public void setChannelPosition(Block b, BlockWriteStreams streams, long dataOffset, long ckOffset)
     throws IOException {
   long size = 0;
   synchronized (this) {
     FSVolume vol = volumeMap.get(b).getVolume();
     size = vol.getTmpFile(b).length();
   }
   if (size < dataOffset) {
     String msg =
         "Trying to change block file offset of block "
             + b
             + " to "
             + dataOffset
             + " but actual size of file is "
             + size;
     throw new IOException(msg);
   }
   FileOutputStream file = (FileOutputStream) streams.dataOut;
   file.getChannel().position(dataOffset);
   file = (FileOutputStream) streams.checksumOut;
   file.getChannel().position(ckOffset);
 }