Postgres recovery_prefetch can cause outages, warns detailed postmortem
plaur782 · hn · 2026-10-22
A HN-discussed deep dive argues PostgreSQL's recoveryprefetch setting can trigger outages in certain recovery scenarios, walking through real incident conditions.
- Explains the interaction between IO prefetching and WAL replay during recovery, and why it can stall or crash instances
- Offers practical guidance on when to disable or tune the parameter to avoid production risk
- Directly relevant for anyone operating Postgres in production
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