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LRU Cache Gone Wrong

MediumNode · Express · Jest

00:00 / 20:00

PERF-17 · Hot-item cache hit rate is 0%

The catalogue team's in-process LRU cache reports 0 hits in production and seems to throw away whatever was just inserted. The contract is in the class doc comment.

Concepts

Map insertion orderLRU evictionfalsy valuesboundary conditions

Workflow that wins the OA: run the tests → read the first failure → open the file it points to → form one hypothesis → change one thing → rerun. Use the Request flow tab to see exactly which middleware/handler/DB calls ran.

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