code: public void load(CFMetaData cfm)
      {
          Pair<String, String> key = Pair.create(cfm.ksName, cfm.cfName);
  
          if (cfIdMap.containsKey(key))
              throw new RuntimeException(String.format("Attempting to load already loaded column family %s.%s", cfm.ksName, cfm.cfName));
  
          logger.debug("Adding {} to cfIdMap", cfm);
          cfIdMap.put(key, cfm.cfId);
      }
docs: Load individual ColumnFamily Definition to the schema
  (to make ColumnFamily lookup faster)
  
  @param cfm The ColumnFamily definition to load