Re: Proposal for CSN based snapshots

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Craig Ringer <craig(at)2ndquadrant(dot)com>
Cc: Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, Greg Stark <stark(at)mit(dot)edu>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Andres Freund <andres(at)2ndquadrant(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Rajeev rastogi <rajeev(dot)rastogi(at)huawei(dot)com>, Ants Aasma <ants(at)cybertec(dot)at>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Markus Wanner <markus(at)bluegap(dot)ch>
Subject: Re: Proposal for CSN based snapshots
Date: 2014-06-17 16:41:32
Message-ID: CA+TgmoZ8iWw0XstPm5PLPyeRgAjaMk7PT0EXz4qZnj5nx5pKsA@mail.gmail.com
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On Mon, Jun 16, 2014 at 12:58 AM, Craig Ringer <craig(at)2ndquadrant(dot)com> wrote:
> On 05/30/2014 11:14 PM, Heikki Linnakangas wrote:
>> Yeah. To recap, the failure mode is that if the master crashes and
>> restarts, the transaction becomes visible in the master even though it
>> was never replicated.
>
> Wouldn't another pg_clog bit for the transaction be able to sort that out?

How?

--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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