Beyond TTL: Explicit Cache Invalidation
Most engineers default to TTL for cache invalidation. But a simple Time-To-Live guarantees stale reads for a duration, which is unacceptable for criti…
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Why Daily Transaction Volume is the Wrong Number to Quote in System Design Interviews
The Mistake Most Candidates Make Picture this: You are in a system design interview. The interviewer asks you to design a ledger system or a payment s…
Your "Cache Invalidation is Hard" Answer Misses the Real Horror
Your "Cache Invalidation is Hard" Answer Misses the Real Horror Most engineers parrot "cache invalidation is hard" as a standard interview response, b…