From: | Achilleas Mantzios <a(dot)mantzios(at)cloud(dot)gatewaynet(dot)com> |
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To: | pgsql-admin <pgsql-admin(at)lists(dot)postgresql(dot)org> |
Subject: | PostgreSQL 16.6 , query stuck with STAT Ssl, wait_event_type : IPC , wait_event : ParallelFinish |
Date: | 2025-05-31 20:43:52 |
Message-ID: | c1d1e271-9a71-4469-85da-da168fc6440e@cloud.gatewaynet.com |
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Lists: | pgsql-admin |
Hi
a query is stuck with the above, it seems it waits for parallel worker
to finish, however , there are no parallel works running :
postgres(at)[local]/dynacom=# SELECT application_name, backend_type,
backend_start,xact_start,query_start,wait_event_type, wait_event ,state
FROM pg_stat_activity;
application_name | backend_type | backend_start
| xact_start | query_start
| wait_event_type | wait_event | state
------------------+------------------------------+-------------------------------+-------------------------------+-------------------------------+-----------------+---------------------+--------
| autovacuum launcher | 2024-11-29
17:48:50.92935+02 | |
| Activity | AutoVacuumMain |
| logical replication launcher | 2024-11-29
17:48:50.929496+02 | |
| Activity | LogicalLauncherMain |
DBMIRROR | client backend | 2025-05-31
19:04:16.724305+03 | 2025-05-31 19:05:21.686093+03 | 2025-05-31
19:05:21.909936+03 | IPC | ParallelFinish | active
| client backend | 2025-05-31
23:31:30.030806+03 | | 2025-05-31
23:35:05.045573+03 | Client | ClientRead | idle
psql | client backend | 2025-05-31
23:29:33.863485+03 | 2025-05-31 23:35:09.322972+03 | 2025-05-31
23:35:09.322972+03 | | | active
RXMLFVSLS | client backend | 2025-05-31
23:32:37.351131+03 | | 2025-05-31
23:35:09.295221+03 | Client | ClientRead | idle
psql | client backend | 2025-04-28
16:59:55.968442+03 | | 2025-05-27
16:43:56.338228+03 | Client | ClientRead | idle
| background writer | 2024-11-29
17:48:50.916876+02 | |
| Activity | BgWriterMain |
| archiver | 2024-12-03
18:57:36.447067+02 | |
| Activity | ArchiverMain |
| checkpointer | 2024-11-29
17:48:50.916648+02 | |
| Activity | CheckpointerMain |
| walwriter | 2024-11-29
17:48:50.928789+02 | |
| Activity | WalWriterMain |
(11 rows)
postgres(at)[local]/dynacom=#
So, I will terminate this backend now to get the system working again,
we are curious why this happened, our system serves daily 22M+
transactions, this is Saturday night hence the low traffic.
postgres(at)smadb:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 12 (bookworm)
Release: 12
Codename: bookworm
postgres(at)smadb:~$ psql -Aqt -c 'select version()'
PostgreSQL 16.6 on x86_64-pc-linux-gnu, compiled by gcc (Debian
12.2.0-14) 12.2.0, 64-bit
postgres(at)smadb:~$
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