Thread: [GENERAL] Fwd: PostgreSQL 9.4.13 is facing issue in shutting down
Hi,
Recently we have updated our PostgreSQL version from 9.4.12 to 9.4.13. With version 9.4.13 while trying to stop the PostgreSQL server, database is facing issues in shutting down. The problem probably occurs because of the WAL sender process not getting terminated on shutdown request.
ps output:
postgre+ 7915 0.0 1.9 589772 39528 ? S< 09:11 0:00 /..../bin/postgres -D /.../postgresql -h 0.0.0.0 -p 5432
postgre+ 8617 0.0 0.4 590760 8344 ? S<s 09:13 0:00 postgres: wal sender process replicator xx.xx.xx.xxx(45948) streaming 0/4000090
Sequence of events in log:
FATAL: terminating connection due to administrator command
LOG: received fast shutdown request
LOG: aborting any active transactions
LOG: autovacuum launcher shutting down
LOG: shutting down
LOG: database system is shut down
FATAL: the database system is shutting down
FATAL: the database system is shutting down
FATAL: the database system is shutting down
FATAL: the database system is shutting down
FATAL: the database system is shutting down
FATAL: the database system is shutting down
FATAL: the database system is shutting down
FATAL: the database system is shutting down
We are using pg_ctl fast mode to shutdown the postgres server.
Regards,
Abhijit
Re: [GENERAL] [BUGS] Fwd: PostgreSQL 9.4.13 is facing issue in shutting down
From
Michael Paquier
Date:
On Tue, Aug 22, 2017 at 1:58 PM, Abhijit Gharami <abhijitgharami@gmail.com> wrote: > Recently we have updated our PostgreSQL version from 9.4.12 to 9.4.13. With > version 9.4.13 while trying to stop the PostgreSQL server, database is > facing issues in shutting down. The problem probably occurs because of the > WAL sender process not getting terminated on shutdown request. > ps output: > postgre+ 7915 0.0 1.9 589772 39528 ? S< 09:11 0:00 > /..../bin/postgres -D /.../postgresql -h 0.0.0.0 -p 5432 > postgre+ 8617 0.0 0.4 590760 8344 ? S<s 09:13 0:00 postgres: > wal sender process replicator xx.xx.xx.xxx(45948) streaming 0/4000090 One change introduced between 9.4.12 and 9.4.13 is the way WAL senders are stopped at shutdown. The checkpointer will first send a signal to all the WAL senders after all the normal backends have exited before beginning to issue the checkpoint shutdown. This will switch the WAL senders to a stopping state where all new queries are blocked, and all WAL senders exit after they have sent any remaining WAL to the clients, including the checkpoint shutdown record. So, what is the client behind this WAL sender? It seems that this WAL sender is waiting for some confirmation activity. -- Michael
Re: [GENERAL] [BUGS] Fwd: PostgreSQL 9.4.13 is facing issue in shutting down
From
Abhijit Gharami
Date:
The client is a Hot Standby server.
Regards,
Abhijit
On Tue, Aug 22, 2017 at 11:05 AM, Michael Paquier <michael.paquier@gmail.com> wrote:
On Tue, Aug 22, 2017 at 1:58 PM, Abhijit Gharami
<abhijitgharami@gmail.com> wrote:
> Recently we have updated our PostgreSQL version from 9.4.12 to 9.4.13. With
> version 9.4.13 while trying to stop the PostgreSQL server, database is
> facing issues in shutting down. The problem probably occurs because of the
> WAL sender process not getting terminated on shutdown request.
> ps output:
> postgre+ 7915 0.0 1.9 589772 39528 ? S< 09:11 0:00
> /..../bin/postgres -D /.../postgresql -h 0.0.0.0 -p 5432
> postgre+ 8617 0.0 0.4 590760 8344 ? S<s 09:13 0:00 postgres:
> wal sender process replicator xx.xx.xx.xxx(45948) streaming 0/4000090
One change introduced between 9.4.12 and 9.4.13 is the way WAL senders
are stopped at shutdown. The checkpointer will first send a signal to
all the WAL senders after all the normal backends have exited before
beginning to issue the checkpoint shutdown. This will switch the WAL
senders to a stopping state where all new queries are blocked, and all
WAL senders exit after they have sent any remaining WAL to the
clients, including the checkpoint shutdown record. So, what is the
client behind this WAL sender? It seems that this WAL sender is
waiting for some confirmation activity.
--
Michael