| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Greg Stark <stark(at)mit(dot)edu> |
| Cc: | Florian Pflug <fgp(at)phlo(dot)org>, Bruce Momjian <bruce(at)momjian(dot)us>, Ants Aasma <ants(at)cybertec(dot)at>, Andres Freund <andres(at)2ndquadrant(dot)com>, Jeff Davis <pgsql(at)j-davis(dot)com>, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Greg Smith <greg(at)2ndquadrant(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Enabling Checksums |
| Date: | 2013-04-17 17:22:01 |
| Message-ID: | 4121.1366219321@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Greg Stark <stark(at)mit(dot)edu> writes:
> On Wed, Apr 17, 2013 at 4:28 PM, Florian Pflug <fgp(at)phlo(dot)org> wrote:
>> Is there any way we can change the checksum algorithm in 9.4
>> *without* breaking pg_upgrade?
> Personally I think we're going to need a solution for page format
> changes someday eventually....
> What advantages are we postponing now to avoid it?
Um, other than the ability to make a release?
We aren't going to hold up 9.3 until that particular bit of pie in the
sky lands. Indeed I don't expect to see it available in the next couple
years either. When we were looking at that seriously, two or three
years ago, arbitrary page format changes looked *hard*.
The idea of bumping the page format version number to signal a checksum
algorithm change might work though.
regards, tom lane
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