Redis caching: the invalidation I got wrong first
Cache-aside looked simple until two writers raced. What I changed, and what I would measure before adding a cache next time.
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Designing a URL shortener
The classic interview system, built small and measured: where the reads go, what the cache is for, and the one decision that made everything else easy.
The bug that only appeared on Fridays
A cache warm-up running on a schedule nobody remembered setting. A short story about assumptions hidden in configuration.
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If this note raised a question, or you would have designed it differently, I would like to hear it.
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