AppendBlockHeader header = new AppendBlockHeader(version,
dfsClient.namespaceId, block.getBlockId(), block.getNumBytes(),
block.getGenerationStamp(),
pipelineDepth, false, null, pipelineDepth - 1,
nodes, client);
header.writeVersionAndOpCode(out);
header.write(out);
}
checksum.writeHeader(out);
out.flush();