Re: pg_export_snapshot on standby side

From: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>
To: Fujii Masao <masao(dot)fujii(at)gmail(dot)com>
Cc: Simon Riggs <simon(at)2ndquadrant(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: pg_export_snapshot on standby side
Date: 2013-05-25 20:56:48
Message-ID: 20130525205647.GQ15045@eldon.alvh.no-ip.org
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Fujii Masao escribió:
> On Sat, May 25, 2013 at 6:18 PM, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:

> > I think we should treat this as a bug and fix it in 9.3 while we're
> > still in beta.
>
> +1
>
> > Why? Because once we begin using the topXid as the
> > filename we can't then change later to using the vxid.
>
> I'm afraid that pg_export_snapshot() in 9.2 has already been using
> topXid as the filename.

I don't think this matters at all. The filename is an implementation
detail which we don't even need to keep compatible across pg_upgrade.
If we think this is a bug, we should backpatch the fix to 9.2.

--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services

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