Re: many "cp: cannot stat xxx No such file or directory" logs in warm standby

On 2020/09/28 14:12, Hong Yao wrote:
> Hi all
>
> I am setting up a standby server for my PG-12.4 primary server, following the doc https://www.postgresql.org/docs/12/warm-standby.html#STANDBY-SERVER-SETUP (26.2.4. Setting Up a Standby Server"
> The OSes are CentOS-7.8
>
> The steps on the standby:

(...)

> * set restore command in postgresql.conf
> o /    restore_command = 'cp /var/pg_wal_archive/%f %p' /
> o /    archive_cleanup_command = 'pg_archivecleanup /var/pg_wal_archive %r'/

(...)

> But in the standalone logs, i see following errors keep repeating:
>
> /cp: cannot stat ‘/var/pg_wal_archive/000000020000000000000014’: No such file or directory/
> /cp: cannot stat ‘/var/pg_wal_archive/00000003.history’: No such file or directory/

This is expected, as PostgreSQL is speculatively looking for files which may have
arrived since the last check.

Per the documentation [1]:

"The command will be asked for file names that are not present in the archive"

[1] https://www.postgresql.org/docs/current//runtime-config-wal.html#GUC-RESTORE-COMMAND

Regards

Ian Barwick

--
Ian Barwick https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services