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The Complete Roadmap to System Design Mastery.
When Stripe processed their billionth API call in 2019, every region was simultaneously accepting payments. A datacenter fire in Europe didn’t redirect traffic—it simply stopped receiving its share. Users in London seamlessly connected to Dublin, experiencing only 12ms additional latency instead of complete downtime. This is active-active architecture: not a backup plan, but a fundamental design where all regions operate as equals.
Feb 22
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