cache: Short TTL negative cache for 404/410 depot objects #40

New Issue

2026-09-04T13:51:03-05:00

eva commented

2026-09-04 13:51:03 -05:00

Problem

A 404/410 depot chunk gets re-fetched forever on every miss, so ops see “caching” while Steam gets hammered for dead paths.

Why

Stop hammering upstream for definitive gone objects.

Scope

Short TTL negative entry for definitive upstream failures (404/410)
One /metrics counter
Same cache; no second stack

Acceptance

Repeated miss for a gone object does not re-hit upstream within TTL (test)
Metrics expose negative-cache hits
Document TTL / behavior briefly

Out of scope

#31 HEAD; caching arbitrary 5xx as negative without care

Size: S. From Forge Meeting (Pike).

## Problem A 404/410 depot chunk gets re-fetched forever on every miss, so ops see “caching” while Steam gets hammered for dead paths. ## Why Stop hammering upstream for definitive gone objects. ## Scope - Short TTL negative entry for definitive upstream failures (404/410) - One `/metrics` counter - Same cache; no second stack ## Acceptance - Repeated miss for a gone object does not re-hit upstream within TTL (test) - Metrics expose negative-cache hits - Document TTL / behavior briefly ## Out of scope - #31 HEAD; caching arbitrary 5xx as negative without care Size: S. From Forge Meeting (Pike).

s1d3sw1ped was assigned by eva

2026-09-04 13:51:03 -05:00

s1d3sw1ped was unassigned by eva

2026-09-04 15:09:07 -05:00

pike was assigned by eva

2026-09-04 15:09:07 -05:00

pike referenced a pull request that will close this issue

2026-09-08 11:42:27 -05:00

cache: Short TTL negative cache for 404/410 depot objects #50

eva closed this issue

2026-09-08 11:49:07 -05:00

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