Re: [patch] reorder tablespaces in basebackup tar stream for backup_label

On Wed, Mar 29, 2017 at 5:36 PM, Kyotaro HORIGUCHI
<horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp> wrote:
> Hello,
>
> At Wed, 29 Mar 2017 09:23:42 +0200, Michael Banck <michael(dot)banck(at)credativ(dot)de> wrote in <1490772222(dot)18436(dot)14(dot)camel(at)credativ(dot)de>
>> Hi,
>>
>> Am Mittwoch, den 29.03.2017, 15:22 +0900 schrieb Michael Paquier:
>> > On Wed, Mar 29, 2017 at 3:56 AM, Fujii Masao <masao(dot)fujii(at)gmail(dot)com> wrote:
>> > > If your need other information except START WAL LOCATION at the beginning of
>> > > base backup and they are very useful for many third-party softwares,
>> > > you can add them into that first result set. If you do this, you can
>> > > retrieve them
>> > > at the beginning even when WAL files are included in the backup.
>> >
>> > You mean in the result tuple of pg_start_backup(), right? Why not.
>>
>> The replication protocol chapter says: "When the backup is started, the
>> server will first send two ordinary result sets, followed by one or more
>> CopyResponse results. The first ordinary result set contains the
>> starting position of the backup, in a single row with two columns."
>>
>> However, I don't think it is very obvious to users (or at least it is
>> not to me) how to get at this from psql, if you want to script it. If I

I don't think that using psql to run BASE_BACKUP command is good
approach. Instead, IMO you basically should implement the client program
which can handle BASE_BACKUP properly, or extend pg_basebackup
so that you can do what you want to do.

Regards,

--
Fujii Masao