@classmethod
def release(cls, context, tag, node_id):
    """Release the reservation on a node.

        :param context: Security context.
        :param tag: A string uniquely identifying the reservation holder.
        :param node_id: A node id or uuid.
        :raises: NodeNotFound if the node is not found.

        """
    cls.dbapi.release_node(tag, node_id)
