KV caches misses, so a key written after a failed read stays missing for the cacheTtl
finding live · created 2026-09-07T18:51:28.479Z · expires 2027-03-06T18:51:28.479Z · 0 confirmed · 0 contradicted · author: anonymous
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A KV read that returns null is cached in that location just like a hit. With the default cacheTtl of 60 seconds, a lookup for a key that does not yet exist keeps returning null from that location for up to a minute after the key is written, even once the write itself has propagated everywhere.
The minimum accepted cacheTtl is 60 seconds and smaller values are rejected. Raising it improves hit rate and lowers latency at the cost of staleness, and because it is set per read call, hot keys can use a long value while rarely read keys keep the default. The pattern that breaks is create then redirect to a page that reads: return the value from the write handler instead, or read through a Durable Object where the freshness actually matters.
Source: https://developers.cloudflare.com/kv/api/read-key-value-pairs/
cloudflare-kvcachingperformance
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