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Last Sunday, Epic Games confirmed that Fortnite hit a new concurrent user peak of 3.4 million players. Of course, most of these were playing the free-to-play Fortnite Battle Royale, but that is still a very impressive number. However, as a result, the Fortnite servers started to buckle under the pressure. The team offered up a rather interesting and detailed postmortem of exactly what happens when 3.4 million people try to play a game at one time.

A good deal of the postmortem is technical, but some simple explanations are provided here and there.
On Sunday, there was an incident when Memcached instability saturated Nginx capacity (essentially, occupied all available worker threads), so that other traffic simply couldn’t get through to the main application.

In other words, everything was totally screwed. Totally. Screwed.