Re: BUG #5935: Log lotation not working for default log format

What would you expect the new log file to be named? Your log_filename is set to postgresql-%a.log. The %a part expands to the current day of the week. If it's Thursday and you already have a file for Thursday, what would the new file name be?

-- Korry

> The following bug has been logged online:
>
> Bug reference: 5935
> Logged by: Brad Nicholson
> Email address: bnicholson(at)hp(dot)com
> PostgreSQL version: 9.0.3
> Operating system: CentOS Release 5.5
> Description: Log lotation not working for default log format
> Details:
>
> PostgreSQL 9.0.3 on x86_64-unknown-linux-gnu, compiled by GCC gcc (GCC)
> 4.1.2 20080704 (Red Hat 4.1.2-48), 64-bit
> CentOS release 5.5 (Final)
>
> (using the standard PG package)
>
> The logfile will not rotate if the log_filename is set to postgresql-%a.log,
> which is the default setting after an initdb on my platform.
>
>
> I have tested this by setting log_rotation_size and exceeding that threshold
> and manually trying to rotate the logs with SELECT pg_rotate_logfile().
> Both fail to rotate the log file.
>
>
> Manual Rotate:
>
> [postgres(at)pg1 pgdata]$ ls -al logs/
> total 24
> drwxr-xr-x 2 postgres postgres 4096 Mar 17 13:11 .
> drwxr-xr-x 4 postgres postgres 4096 Mar 17 13:08 ..
> -rw------- 1 postgres postgres 150 Mar 17 13:11 postgresql-Thu.log
> [postgres(at)pg1 pgdata]$ psql -p 6432 -c "show log_filename;" postgres
> log_filename
> -------------------
> postgresql-%a.log
> (1 row)
>
> [postgres(at)pg1 pgdata]$ psql -p 6432 -c "SELECT pg_rotate_logfile()"
> postgres
> pg_rotate_logfile
> -------------------
> t
> (1 row)
>
> [postgres(at)pg1 pgdata]$ ls -al logs/
> total 24
> drwxr-xr-x 2 postgres postgres 4096 Mar 17 13:11 .
> drwxr-xr-x 4 postgres postgres 4096 Mar 17 13:08 ..
> -rw------- 1 postgres postgres 150 Mar 17 13:11 postgresql-Thu.log
>
>
>
> Size based automatic rotation:
>
> [postgres(at)pg1 pgdata]$ psql -p 6432 -c "show log_rotation_size;" postgres
> log_rotation_size
> -------------------
> 1MB
> (1 row)
>
> <generate some pgbench traffic with full statement logging>
>
> [postgres(at)pg1 pgdata]$ ls -thl logs/
> total 3.2M
> -rw------- 1 postgres postgres 3.2M Mar 17 13:24 postgresql-Thu.log
>
>
>
> If I switch the log_filename to something more specific like
> postgresql-%Y-%m-%d_%H_%M_%S.log - the logfile rotates.
>
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