There was a great talk at SRECon Europe 2015 about how Facebook scales out their load balancers: https://patrickshuff.com/building-a-billion-user-load-balancer-

There was a great talk at SRECon Europe 2015 about how Facebook scales out their load balancers: https://patrickshuff.com/building-a-billion-user-load-balancer-srecon-europe-2015.html https://patrickshuff.com/building-a-billion-user-load-balanc... Shows how many levels of scaling are required to serve traffic at large scale.