private void copyBlock(DataInputStream in,
VersionAndOpcode versionAndOpcode) throws IOException {
// Read in the header
CopyBlockHeader copyBlockHeader = new CopyBlockHeader(versionAndOpcode);
copyBlockHeader.readFields(in);
long startTime = System.currentTimeMillis();
int namespaceId = copyBlockHeader.getNamespaceId();
long blockId = copyBlockHeader.getBlockId();
long genStamp = copyBlockHeader.getGenStamp();
Block block = new Block(blockId, 0, genStamp);