The Infrastructure Behind Twitter: Scaling Networking, Storage and Provisioning: "By late 2010 Twitter had finalised their first in-house network architecture that was designed to address scale and service issues that were encountered with the existing third-party colocated infrastructure. Initially, the use of deep buffer Top of Rack (ToR) switches, and carrier-grade core network switches allowed Twitter to support previously unseen transaction per second (TPS) volumes that were generated as a result of global events such as the World Cup Football in 2014. However, over the next several years the Twitter infrastructure team added network point-of-presence (PoPs) over five continents, and in 2015 Twitter moved from a traditional hierarchical data center network topology to a Clos network using Border Gateway Protocol (BGP) for routing. Highlights of the Clos approach include a smaller 'blast radius' of a single device failure, horizontal bandwidth scaling capabilities, and higher route capacity due to lower CPU overhead."
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