When millions click at once, auto-scaling won’t save you — smart systems survive with load shedding, isolation and lots of brutal game-day drills.

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Handling massive concurrent traffic spikes requires more than auto-scaling. Four critical patterns ensure system survival: aggressive load shedding that prioritizes critical requests over non-essential ones, bulkhead isolation to prevent cascading failures across services, request collapsing to prevent cache stampedes when millions request the same data, and regular game-day rehearsals that simulate disaster scenarios. The key is designing systems that degrade gracefully under extreme load rather than catastrophically failing.

The ‘Super Bowl’ standard: Architecting distributed systems for massive concurrency