public function onRequestExecute(RequestEvent $event)
    {
        $request = $event->getRequest();

        //Make sure we have some nodes to choose from
        if (count($this->nodes) === 0) {
            throw new RuntimeException("No nodes in cluster, request failed");
        }

        //Choose a random node
        $request->node = $this->nodes[array_rand($this->nodes)];

    }