def _remove_node(self, node_name):
        """Remove the given node from the continuum/ring.

        :param node_name: the node name.
        """
        try:
            self._nodes.pop(node_name)
        except Exception:
            raise KeyError('node \'{}\' not found, available nodes: {}'.format(
                node_name, self._nodes.keys()))
        else:
            self._create_ring(self._nodes)
Remove the given node from the continuum/ring.

        :param node_name: the node name.