*/
void readMetadata(DataInputStream in, VersionAndOpcode versionAndOpcode)
throws IOException {
ReadMetadataHeader readMetadataHeader =
new ReadMetadataHeader(versionAndOpcode);
readMetadataHeader.readFields(in);
final int namespaceId = readMetadataHeader.getNamespaceId();
Block block = new Block(readMetadataHeader.getBlockId(), 0,
readMetadataHeader.getGenStamp());
MetaDataInputStream checksumIn = null;
DataOutputStream out = null;