code: @Override
    public HTableDescriptor[] listTableDescriptorsByNamespace(String name) throws IOException {
      if (provideWarningsForNamespaces()) {
        LOG.warn("listTableDescriptorsByNamespace is a no-op");
        return new HTableDescriptor[0];
      } else {
        throw new UnsupportedOperationException("listTableDescriptorsByNamespace");  // TODO
      }
    }
docs: {@inheritDoc}