How does Facebook handle load balancing?

The load balancers take communications addressed to a single virtual IP address, and share them out amongst a large fleet of back-end servers, so each users requests go consistently to a single server (the red and green packets in the diagram).

How does Google do load balancing?

Google’s global load balancer knows where the clients are located and directs packets to the closest web service, providing low latency to users while using a single virtual IP (VIP). Using a single VIP means we can increase the time to live (TTL) of our DNS records, which further reduces latency.

How load balancing is implemented?

Edit: Load balancing can be implemented by DNS round robin too. Each DNS lookup call returns another IP address for the same domain name. The client choose an IP and connects to this server. Another client can use the next IP.

Which software is used for load balancing?

Comparison Of Best Load Balancing Software

Best Load Balancing Software	Best For	Ratings *****
Nginx	Cloud web and mobile applications	5/5
Avi Vantage Software Load Balancer	Load balancing for multi-cloud and on-premise environments	5/5
HAProxy	Fast and reliable load balancing for TCP/HTTP-based applications on Linux platforms	5/5

How does Facebook load so fast?

According to Gigaom, Facebook uses Autoscale as an intermediary between incoming traffic and the company’s servers. During periods of low network traffic, Autoscale distributes this traffic to a smaller number of servers and keeps these servers running at medium capacity.

How many requests per second does Facebook handle?

With 500 Million users, Facebook had 13M requests per second. Now, with 4 billion users, they probably handle ±100M requests per second.

Why load balancer is needed?

The main purpose of load balancing is to prevent any single server from getting overloaded and possibly breaking down. In other words, load balancing improves service availability and helps prevent downtimes.