code: @Override
      public boolean checkFacadeAllowed(String table, FacadeOptions options)
              throws FacadeExistsException {
          return checkFacadeAllowed(readTableJson(table, true), options.getPlacement(), null);
      }
docs: Returns true if facade may be created for the specified table and placement.
  Throws an exception if a facade is not allowed because of a conflict with the master or another facade.
  Returns false if there is already a facade at the specified placement, so facade creation would be idempotent.