Package org.apache.hadoop.hdfs.server.datanode

Examples of org.apache.hadoop.hdfs.server.datanode.BlockMetadataHeader

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      checksumIn = new DataInputStream(
          new BufferedInputStream(new FileInputStream(metaFile),
              HdfsConstants.IO_FILE_BUFFER_SIZE));

      // read and handle the common header here. For now just a version
      BlockMetadataHeader header = BlockMetadataHeader.readHeader(checksumIn);
      short version = header.getVersion();
      if (version != BlockMetadataHeader.VERSION) {
        FsDatasetImpl.LOG.warn("Wrong version (" + version + ") for metadata file "
            + metaFile + " ignoring ...");
      }
      DataChecksum checksum = header.getChecksum();
      int bytesPerChecksum = checksum.getBytesPerChecksum();
      int checksumSize = checksum.getChecksumSize();
      long numChunks = Math.min(
          (blockFileLen + bytesPerChecksum - 1)/bytesPerChecksum,
          (metaFileLen - crcHeaderLen)/checksumSize);
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        if (i == 0) {
          // write 'data' file
          fos.write(1);
        } else {
          // write 'metadata' file
          BlockMetadataHeader header =
              new BlockMetadataHeader((short)1,
                  DataChecksum.newDataChecksum(DataChecksum.Type.NULL, 4));
          DataOutputStream dos = new DataOutputStream(fos);
          BlockMetadataHeader.writeHeader(dos, header);
          dos.close();
        }
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  private static void verifyChecksum(long length,
      FileInputStream metaIn, FileChannel blockChannel, String blockFileName)
          throws IOException, ChecksumException {
    // Verify the checksum from the block's meta file
    // Get the DataChecksum from the meta file header
    BlockMetadataHeader header =
        BlockMetadataHeader.readHeader(new DataInputStream(
            new BufferedInputStream(metaIn, BlockMetadataHeader
                .getHeaderSize())));
    FileChannel metaChannel = null;
    try {
      metaChannel = metaIn.getChannel();
      if (metaChannel == null) {
        throw new IOException("Block InputStream meta file has no FileChannel.");
      }
      DataChecksum checksum = header.getChecksum();
      final int bytesPerChecksum = checksum.getBytesPerChecksum();
      final int checksumSize = checksum.getChecksumSize();
      final int numChunks = (8*1024*1024) / bytesPerChecksum;
      ByteBuffer blockBuf = ByteBuffer.allocate(numChunks*bytesPerChecksum);
      ByteBuffer checksumBuf = ByteBuffer.allocate(numChunks*checksumSize);
 
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        // get the metadata file
        File metafile = new File(pathinfo.getMetaPath());
        FileInputStream checksumIn = new FileInputStream(metafile);
   
        // read and handle the common header here. For now just a version
        BlockMetadataHeader header = BlockMetadataHeader.readHeader(new DataInputStream(checksumIn), new PureJavaCrc32());
        short version = header.getVersion();
     
        if (version != FSDataset.METADATA_VERSION) {
          LOG.warn("Wrong version (" + version + ") for metadata file for "
              + blk + " ignoring ...");
        }
        DataChecksum checksum = header.getChecksum();

        return new BlockReaderLocal(conf, file, blk, startOffset, length,
            pathinfo, metrics, checksum, verifyChecksum, dataIn, checksumIn,
            clearOsBuffer);
      }
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  private BlockReaderLocal(Builder builder) {
    this.replica = builder.replica;
    this.dataIn = replica.getDataStream().getChannel();
    this.dataPos = builder.dataPos;
    this.checksumIn = replica.getMetaStream().getChannel();
    BlockMetadataHeader header = builder.replica.getMetaHeader();
    this.checksum = header.getChecksum();
    this.verifyChecksum = builder.verifyChecksum &&
        (this.checksum.getChecksumType().id != DataChecksum.CHECKSUM_NULL);
    this.filename = builder.filename;
    this.block = builder.block;
    this.bytesPerChecksum = checksum.getBytesPerChecksum();
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        // get the metadata file
        File metafile = new File(pathinfo.getMetaPath());
        checksumIn = new FileInputStream(metafile);

        // read and handle the common header here. For now just a version
        BlockMetadataHeader header = BlockMetadataHeader
            .readHeader(new DataInputStream(checksumIn));
        short version = header.getVersion();
        if (version != BlockMetadataHeader.VERSION) {
          LOG.warn("Wrong version (" + version + ") for metadata file for "
              + blk + " ignoring ...");
        }
        DataChecksum checksum = header.getChecksum();
        long firstChunkOffset = startOffset
            - (startOffset % checksum.getBytesPerChecksum());
        localBlockReader = new BlockReaderLocalLegacy(conf, file, blk, token,
            startOffset, length, pathinfo, checksum, true, dataIn,
            firstChunkOffset, checksumIn);
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    this.block = block;
    this.fisCache = fisCache;

    // read and handle the common header here. For now just a version
    checksumIn.getChannel().position(0);
    BlockMetadataHeader header = BlockMetadataHeader
        .readHeader(new DataInputStream(
            new BufferedInputStream(checksumIn,
                BlockMetadataHeader.getHeaderSize())));
    short version = header.getVersion();
    if (version != BlockMetadataHeader.VERSION) {
      throw new IOException("Wrong version (" + version + ") of the " +
          "metadata file for " + filename + ".");
    }
    this.verifyChecksum = verifyChecksum && !conf.skipShortCircuitChecksums;
    long firstChunkOffset;
    if (this.verifyChecksum) {
      this.checksum = header.getChecksum();
      this.bytesPerChecksum = this.checksum.getBytesPerChecksum();
      this.checksumSize = this.checksum.getChecksumSize();
      firstChunkOffset = startOffset
          - (startOffset % checksum.getBytesPerChecksum());
      this.offsetFromChunkBoundary = (int) (startOffset - firstChunkOffset);
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        // get the metadata file
        File metafile = new File(pathinfo.getMetaPath());
        checksumIn = new FileInputStream(metafile);

        // read and handle the common header here. For now just a version
        BlockMetadataHeader header = BlockMetadataHeader
            .readHeader(new DataInputStream(checksumIn));
        short version = header.getVersion();
        if (version != BlockMetadataHeader.VERSION) {
          LOG.warn("Wrong version (" + version + ") for metadata file for "
              + blk + " ignoring ...");
        }
        DataChecksum checksum = header.getChecksum();
        long firstChunkOffset = startOffset
            - (startOffset % checksum.getBytesPerChecksum());
        localBlockReader = new BlockReaderLocalLegacy(conf, file, blk, token,
            startOffset, length, pathinfo, checksum, true, dataIn,
            firstChunkOffset, checksumIn);
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        // get the metadata file
        File metafile = new File(pathinfo.getMetaPath());
        checksumIn = new FileInputStream(metafile);

        // read and handle the common header here. For now just a version
        BlockMetadataHeader header = BlockMetadataHeader
            .readHeader(new DataInputStream(checksumIn));
        short version = header.getVersion();
        if (version != BlockMetadataHeader.VERSION) {
          LOG.warn("Wrong version (" + version + ") for metadata file for "
              + blk + " ignoring ...");
        }
        DataChecksum checksum = header.getChecksum();
        long firstChunkOffset = startOffset
            - (startOffset % checksum.getBytesPerChecksum());
        localBlockReader = new BlockReaderLocal(conf, file, blk, token,
            startOffset, length, pathinfo, checksum, true, dataIn,
            firstChunkOffset, checksumIn);
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      checksumIn = new DataInputStream(
          new BufferedInputStream(new FileInputStream(metaFile),
              HdfsConstants.IO_FILE_BUFFER_SIZE));

      // read and handle the common header here. For now just a version
      BlockMetadataHeader header = BlockMetadataHeader.readHeader(checksumIn);
      short version = header.getVersion();
      if (version != BlockMetadataHeader.VERSION) {
        FsDatasetImpl.LOG.warn("Wrong version (" + version + ") for metadata file "
            + metaFile + " ignoring ...");
      }
      DataChecksum checksum = header.getChecksum();
      int bytesPerChecksum = checksum.getBytesPerChecksum();
      int checksumSize = checksum.getChecksumSize();
      long numChunks = Math.min(
          (blockFileLen + bytesPerChecksum - 1)/bytesPerChecksum,
          (metaFileLen - crcHeaderLen)/checksumSize);
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Related Classes of org.apache.hadoop.hdfs.server.datanode.BlockMetadataHeader

  • org.apache.hadoop.hdfs.BlockReaderLocal
  • org.apache.hadoop.hdfs.BlockReaderLocalBase
  • org.apache.hadoop.hdfs.BlockReaderLocalLegacy
  • org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.BlockPoolSlice
  • org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.MappableBlock
  • org.apache.hadoop.hdfs.shortcircuit.TestShortCircuitCache$TestFileDescriptorPair
  • org.apache.hadoop.hdfs.TestShortCircuitCache$TestFileDescriptorPair
  • org.apache.hadoop.util.DataChecksum
  • java.nio.ByteBuffer
  • java.io.EOFException
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