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fix: call pg_notification_queue_usage() automatically when the LISTEN channel bug is detected (#4858)

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There's a PostgreSQL bug that doesn't let any listener to register in the DB:
https://www.postgresql.org/message-id/flat/CAK98qZ3wZLE-RZJN_Y%2BTFjiTRPPFPBwNBpBi5K5CU8hUHkzDpw%40mail.gmail.com
The only workaround is to advance the async notification queue tail,
which can be done by executing:  "SELECT pg_notification_queue_usage();".
Before we just logged a HINT with this suggestion, but now we call that function directly
and then let the listener to automatically recover.

No automated tests were added here as it would be too complex and this is a PostgreSQL bug. But this was manually tested following the steps on https://github.com/PostgREST/postgrest/pull/4581#issuecomment-3690610592
This commit is contained in:
Laurence Isla
2026-05-04 22:08:06 +05:00
committed by Taimoor Zaeem
parent a62b6de1d0
commit 0502488b70
3 changed files with 19 additions and 14 deletions
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CHANGELOG.md
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@@ -8,6 +8,7 @@ All notable changes to this project will be documented in this file. From versio
- Fix login with uppercase and mixed case role names by @taimoorzaeem in #4678
- Restore Listener query shape so it can be found in `pg_stat_activity` by @mkleczek in #4857 #4859
- The LISTEN channel now automatically recovers when it stops working due to a PostgreSQL bug @laurenceisla in #3147
## [14.10] - 2026-04-16