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xiaoxia-saas/packages/shared
saas-backend-agent 114ce95c04
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fix(gpu-encoder): add pre-warm + first-byte short timeout to guard against P4000 cold-start 150s stalls
P0 issue: 2026-09-27 staging job a15a4667 observed 149.6s delay between worker POST and P4000
starting mezzanine download (nginx access log confirmed GET mezz at 14:12:55 vs POST at 14:10:26).
Root cause is server/network-side (likely Tailscale DERP hole-punching or httpx connection pool rebuild
after long idle), hard to reproduce on demand. This client-side fix adds two layers of defense:

1. pre_warm: before POST, if idle >60s since last successful comm, send a GET /health with 3s timeout
to warm the Tailscale path. Failure is non-fatal; POST proceeds anyway.
2. post_first_byte_timeout (default 20s): split POST timeout into two phases — first byte uses short
timeout so a stalled link fails fast and caller can CPU-fallback; after first byte, relax to
ffmpeg_timeout+60s for real encode+upload. Both configurable via settings.gpu_encode_pre_warm /
settings.gpu_encode_post_first_byte_timeout.

Also updates check_health() to refresh _last_ok_ts on healthy response.
2026-09-27 23:13:27 +08:00
..