@krishnachaytanya: one cache key expired. why did the database melt? it's the Thundering Herd: the instant a hot key's TTL ends, every reader misses the cache at the same millisecond and rushes the DB at once — 10,000 reads slam in and it falls over. the cache was supposed to protect the DB, and its expiry is what killed it. the fix is single-flight: ONE reader goes in to recompute the value, everyone else waits for that one result. one query, not ten thousand. the database survives. (also helps: staggered TTLs, background refresh before expiry, a short per-key lock.) #trending#vibecoding #systemdesign #ai #softwarearchitecture

KrishnaChaitanya|SystemDesign

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Thursday 28 May 2026 13:01:27 GMT