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Turn the chapter's Twitter numbers into average and peak QPS, then into API servers that meet a 99.9% SLA.
A Twitter-like service has 300 million monthly active users. 50% of them use it every day, and each posts 2 tweets a day on average.
Peak traffic is twice the average. In this run the peak lasts from 4 s to 6 s.
Today the API tier is one server with half a CPU core. Size it so the service meets a 99.9% SLA through the peak.
Peak QPS: From monthly users to peak QPS to servers.
Your working architecture goes back to the starting setup above, and your next run starts a new attempt. Previous attempts and completion stay in your history.
A Twitter-like service has 300 million monthly active users. 50% of them use it every day, and each posts 2 tweets a day on average.
Peak traffic is twice the average. In this run the peak lasts from 4 s to 6 s.
Today the API tier is one server with half a CPU core. Size it so the service meets a 99.9% SLA through the peak.