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cache: Coalesce in-flight identical upstream fetches #52

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linus merged 1 commits from cache/coalesce-inflight-fetches into develop 2026-09-08 15:19:26 -05:00
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ash ea195993de cache: Coalesce in-flight identical upstream fetches
CI / vulncheck (pull_request) Successful in 14s
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CI / check-and-test (pull_request) Successful in 48s
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In-flight coalescing already dedups identical misses, but acceptance
still lacked a gated test (without a hold, waiters can become sequential
HITs after the first fill) and the Quick check metrics table omitted
cache_coalesced.

Add steamcache/coalesce_test.go: N concurrent identical GETs share one
upstream fill (leader MISS, waiters HIT-COALESCED) and a 5xx sibling.
Document cache_coalesced next to the other hit/miss fields.

Fixes #35
 2026-09-08 20:00:53 +00:00