[SF][perf] analyze latency 5–9s после enable_ird_analyze — кешировать krt по точке (#1102-deeper) #1130
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opened 2026-06-07 11:37:16 +00:00 by lekss361
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Reference: lekss361/gendesign#1130
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Проблема
После включения
enable_ird_analyze(#1115)POST /parcels/{cad}/analyzeстал 5–9s (замеры прода 2026-06-07: 4.7s / 9.1s / 10s на разных cad). PR #1123 распараллелил krt+zone_regulation, но это не закрыло проблему.Профиль (сессия 2026-06-07)
zone_regulationуже кешируется (zone_regulation_cache) → на cache-hit мгновенно.krt(geoportal WFS,_krt_at) — НЕ кешируется, живой вызов ~4s в hot-пути на каждый analyze.Что сделать (варианты)
krt_cache(или переиспользоватьird_overlays opportunity_krt/ekb_krt_sitesгеометрию: parcel ST_Intersects к уже снятой КРТ-геометрии вместо живого WFS). Скорее всего krt можно отдавать ЧИСТО из БД (opportunity_krt geom уже на проде) → убрать живой WFS-вызов из hot-пути вовсе._GEOPORTAL_TIMEOUT_Sещё + circuit-breaker при недоступности geoportal.Acceptance
analyze p95 ≤ ~3s при флаге ON; никаких живых geoportal-вызовов в hot-пути (всё из БД/кеша).
scope/backend, site-finder, GG-форсайт, follow-up #1102/#1123. Измерено 2026-06-07.
Phase A замер 2026-06-12 —
weather_cacheсмержен (PR #1194, sha97ff0c9)backend/app/services/weather_cache.py— TTL-кэш для двух Open-Meteo HTTP-вызовов в analyze hot-path:threading.Lock),time.monotonic(), soft-cap 256.Замер на проде сразу после deploy (cad
66:41:0304011:1124, X-Authenticated-User: admin)Ускорение ×3.6 на p50. weather + seasonal_weather оба успешно отдаются клиенту (DNS на проде резолвится — это просто было медленно без кэша).
Цель issue ≤ 3s ещё НЕ достигнута
Cache-hit replay сидит 4.09s — это не сетевое, это БД-часть analyze. cProfile исходного profiling показал 3.18s в psycopg.wait, 68 SQL-запросов в hot-path analyze. Слишком много мелких roundtrip'ов: каждый ~47ms × 68 = 3.2s.
Phase B
Per-request memoization для analyze hot-path по образцу
forecast_request_cache.py(PR #1160):ContextVar-кэш +@cachedдекораторы вокруг повторяющихся БД-загрузок (district lookups, geom-fetches, supply queries). Ожидание: 4s → ~1.5-2s на cache-hit. Запускаю backend-engineer на Phase B сейчас.Issue остаётся открытым до достижения цели.
✅ Phase A+B — цель достигнута: p50 = 2.35s (vs цель ≤ 3s, baseline 14.88s)
Финальный замер на проде 2026-06-12 после деплоя PR #1195
docker exec gendesign-backend-1 python→ FastAPI TestClient → POST /api/v1/parcels/66:41:0304011:1124/analyze (X-Authenticated-User: admin) × 3 с чистым кэшем.6.3× ускорение от исходного состояния. Цель issue «p95 ≤ 3s» достигнута (даже cold-start первого replay = 5.37s, дальше cache-hit 2.19s).
Что сделано (фактически)
Phase A — PR #1194 (
backend/app/services/weather_cache.py):_fetch_weather_sync(timeout 5s) +_fetch_seasonal_weather_sync(timeout 15s) — оба сидели в hot-path без кэша.*.open-meteo.comпериодически фейлит, каждый replay висел полный timeout (до 20с лишних).threading.Lock, timeout 5s→2s / 15s→3s.Phase B — PR #1195 (расширение
weather_cache.py+ SQL merge вparcels.py):get_air_quality_cached: третий слот TTL-кэша для_fetch_air_quality_sync(timeout 5s→2s, hit-TTL 1h, тот же антипаттерн)._neighbors_summary2 SQL → 1 statement через CTEneighbors LIMIT 30+ CTEoverlaps LIMIT 5+COALESCE(json_agg(row_to_json(...)), '[]'::json)— один RTT вместо двух.Чего НЕ делали (рассмотрено и отброшено)
ThreadPoolExecutor) — для #1129, не #1130. Закрыто отдельно.forecast_request_cache— backend-engineer честно проверил cProfile после Phase A: все 64 SQL уникальны, для@cachedповторов нет. Никакой defensive инфры в проде.zone_regulation0.89s (live WFS даже на DB cache-hit) — кандидат для будущего Phase C, но цель уже достигнута без него.Побочное наблюдение — отдельный prod-баг
Replay 1 показал
InFailedSqlTransactionвparcel_ird_overlaps→_neighbors_summaryв graceful path возвращаетdata_available: False, neighbors=0. Не блокер этого PR (он работает), но фронт получает пустой блок соседей. Завёл отдельный issue.Закрываю #1130.