System design
2 posts. All topics
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13 min read
Stale cache and cache stampede: why servers disagree
Why two servers give different answers, how to spot a stale cache, three ways to fix it, and how a cache stampede can follow.
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19 min read
Sessions, JWTs and load balancers explained
A beginner's walkthrough: what sessions and JWTs are, what breaks when you add a second server, how to diagnose it, and how to fix it.