| From: | Heikki Linnakangas <hlinnakangas(at)vmware(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)2ndquadrant(dot)com> |
| Cc: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Robert Haas <robertmhaas(at)gmail(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: | 2014-05-30 18:38:37 |
| Message-ID: | 5388D02D.6040305@vmware.com |
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| Lists: | pgsql-hackers |
(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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