特定のモデレーターではレビューセクションで500サーバーエラーが発生します

zogstrip · 2026 年 10 月 12 日午後 8:52

OFFSET 0のトリックを使わずにクエリを最適化する方法を見つけました

github.com/discourse/discourse

PERF: Check review queue visibility per topic for moderators (#44497)

main ← perf/review-queue-moderator-visibility

merged 08:26AM - 13 Oct 26 UTC

ZogStriP

+95 -30

Previously, the review queue built every visible topic and every private message… a moderator can see as whole-table subqueries (`topic_id IN (...)` and `NOT IN (...)`). On large sites, Postgres scanned millions of posts or rescanned the PM list once per reviewable. `/review` then timed out with a 500 for non-admin moderators (https://meta.discourse.org/t/414526). This change correlates those checks to each reviewable's topic with `EXISTS` / `NOT EXISTS`, so Postgres does index lookups per reviewable, with the same visibility rules. On a 1M topic / 8M post dataset, the count + page queries for a moderator drop from ~10–32s to ~0.5s, and the pending count from ~4.5s to ~50ms.

トピック		返信	表示
Category Moderators may receive incorrect number of pending reviews Bug category-moderators , review-queue	0	83	2026 年 8 月 7 日
Feedback on the new Review Queue (2019) Announcements new-feature , review-queue	260	21110	2023 年 3 月 11 日
Proposal: Consolidated Review Queue Feature	33	6377	2019 年 3 月 28 日
A new review queue layout with all new features Announcements review-queue	43	3008	2026 年 9 月 20 日
App/models/topic_tracking_state - `report` - long response times? Development slow-sql	6	1932	2016 年 2 月 26 日

特定のモデレーターではレビューセクションで500サーバーエラーが発生します

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