Re: pg_stop_backup(wait_for_archive := true) on standby server

On Thu, Jun 22, 2017 at 10:36 PM, Magnus Hagander <magnus(at)hagander(dot)net> wrote:
>
>
> On Thu, Jun 22, 2017 at 10:12 AM, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>
> wrote:
>>
>> Hi,
>>
>> Since an optional second argument wait_for_archive of pg_stop_backup
>> has been introduced in PostgreSQL 10 we can choose whether wait for
>> archiving. But my colleagues found that we can do pg_stop_backup with
>> wait_for_archive = true on the standby server but it actually doesn't
>> wait for WAL archiving. Because this behavior is not documented and we
>> cannot find out it without reading source code it will confuse the
>> user.
>>
>> I think we can raise an error when pg_stop_backup with
>> wait_for_archive = true is executed on the standby. Attached patch
>> change it so that.
>
>
> Wouldn't it be better to make it *work*? If you have archive_mode=always, it
> makes sense to want to wait on the standby as well, does it not?
>

Yes, ideally it will be better to make it wait for WAL archiving on
standby server when archive_mode=always. But I think it would be for
PG11 item, and this item is for PG10.

Regards,

--
Masahiko Sawada
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center