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From: Heikki Linnakangas <hlinnakangas@vmware.com>
To: Andres Freund <andres@2ndquadrant.com>
Cc: Alvaro Herrera <alvherre@2ndquadrant.com>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: Bruce Momjian <bruce@momjian.us>
Cc: Rajeev rastogi <rajeev.rastogi@huawei.com>
Cc: Ants Aasma <ants@cybertec.at>
Cc: PostgreSQL-development <pgsql-hackers@postgresql.org>
Cc: Markus Wanner <markus@bluegap.ch>
Subject: Re: Proposal for CSN based snapshots
Date: Fri, 30 May 2014 21:38:37 +0300
Message-ID: <5388D02D.6040305@vmware.com> (raw)
In-Reply-To: <20140530152721.GC30516@awork2.anarazel.de>
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	<5370D323.1070606@vmware.com>
	<20140512144112.GB9619@awork2.anarazel.de>
	<5370E267.2020904@vmware.com>
	<20140515183436.GD25053@momjian.us>
	<CA+TgmoYiqga4KWz_1=O8D6ivmTAJfY=-fxO6Nk+D-o3M0M60=Q@mail.gmail.com>
	<20140515200632.GB16014@awork2.anarazel.de>
	<20140515213714.GB7857@eldon.alvh.no-ip.org>
	<53889CCB.7030005@vmware.com>
	<20140530152721.GC30516@awork2.anarazel.de>
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(forgot to answer this question)

On 05/30/2014 06:27 PM, Andres Freund wrote:
> On 2014-05-30 17:59:23 +0300, Heikki Linnakangas wrote:
>> * I expanded pg_clog to 64-bits per XID, but people suggested keeping
>> pg_clog as is, with two bits per commit, and adding a new SLRU for the
>> commit LSNs beside it. Probably will need to do something like that to avoid
>> bloating the clog.
>
> It also influences how on-disk compatibility is dealt with. So: How are
> you planning to deal with on-disk compatibility?

Have pg_upgrade read the old clog and write it out in the new format.

- Heikki


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