code: public static Map<InetAddress, UUID> loadHostIds()
      {
          Map<InetAddress, UUID> hostIdMap = new HashMap<InetAddress, UUID>();
          for (UntypedResultSet.Row row : executeInternal("SELECT peer, host_id FROM system." + PEERS_CF))
          {
              InetAddress peer = row.getInetAddress("peer");
              if (row.has("host_id"))
              {
                  hostIdMap.put(peer, row.getUUID("host_id"));
              }
          }
          return hostIdMap;
      }
docs: Return a map of store host_ids to IP addresses