NewBlockReader returns a new BlockReader, given the block information and security token from the namenode.

NewBlockWriter returns a BlockWriter for the given block.

NewChecksumReader creates a new ChecksumReader for the given block.

NewNamenodeConnection creates a new connection to a Namenode, and preforms an initial handshake.

WrapNamenodeConnection wraps an existing net.Conn to a Namenode, and preforms an initial handshake.

BlockReader implements io.ReadCloser, for reading a block.

BlockWriter implements io.WriteCloser for writing a block to a datanode.

ChecksumReader provides an interface for reading the "MD5CRC32" checksums of individual blocks.

NamenodeConnection represents an open connection to a namenode.

NamenodeError represents an interepreted error from the Namenode, including the error code and the java backtrace.