12,000 Clicks a Second, 600 at the Database: Caching the Read Path (System Design Interview in 30 Days, Day 3)

Day 3 of System Design Interview in 30 Days. On Day 1 we turned a vague prompt into numbers for a link shortener: about 4,000 redirects a second on average and 12,000 at peak. On Day 2 we wrote its AP