function getNodeHeight(node) {
            if (node.hosts.size() === 0) {
                return 0;
            }

            var heights = node.hosts.array.map(getNodeHeight);
            var max = 0;
            heights.forEach(function (height) {
                if (height > max) {
                    max = height;
                }
            });
            return max + 1;
        }