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The result of running out of Apache processes over the entire Facebook web tier is not pretty, nor is the dynamic configuration of the Apache process limits enjoyable.Fault tolerance is a desirable characteristic of any big system: if an error happens, the system should try its best to recover without human intervention before giving up and informing the user.The request gets reestablished if it's interrupted or times out.This isn't by any means a new technique: it's a variation of Comet, specifically XHR long polling, and/or BOSH.

Erlang is a functional concurrency-oriented language with extremely low-weight user-space "processes", share-nothing message-passing semantics, built-in distribution, and a "crash and recover" philosophy proven by two decades of deployment on large soft-realtime production systems.Another challenge is ensuring the timely delivery of the messages themselves.The method we chose to get text from one user to another involves loading an iframe on each Facebook page, and having that iframe's Javascript make an HTTP GET request over a persistent connection that doesn't return until the server has data for the client.The secret for going from zero to seventy million users overnight is to avoid doing it all in one fell swoop.