//verify BlockMetaDataInfo
ExtendedBlock b = locatedblock.getBlock();
InterDatanodeProtocol.LOG.info("b=" + b + ", " + b.getClass());
checkMetaInfo(b, datanode);
long recoveryId = b.getGenerationStamp() + 1;
idp.initReplicaRecovery(
new RecoveringBlock(b, locatedblock.getLocations(), recoveryId));
//verify updateBlock
ExtendedBlock newblock = new ExtendedBlock(b.getBlockPoolId(),
b.getBlockId(), b.getNumBytes()/2, b.getGenerationStamp()+1);