| From: | Noah Misch <noah(at)leadboat(dot)com> |
|---|---|
| To: | Greg Smith <greg(at)2ndQuadrant(dot)com> |
| Cc: | Martijn van Oosterhout <kleptog(at)svana(dot)org>, Simon Riggs <simon(at)2ndQuadrant(dot)com>, Ants Aasma <ants(at)cybertec(dot)at>, Jeff Davis <pgsql(at)j-davis(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Andres Freund <andres(at)2ndquadrant(dot)com>, Florian Pflug <fgp(at)phlo(dot)org>, Robert Haas <robertmhaas(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Bruce Momjian <bruce(at)momjian(dot)us>, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com> |
| Subject: | Re: Substituting Checksum Algorithm (was: Enabling Checksums) |
| Date: | 2013-04-30 23:12:04 |
| Message-ID: | 20130430231204.GC27134@tornado.leadboat.com |
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| Lists: | pgsql-hackers |
Orthogonal to this thread, but:
On Tue, Apr 30, 2013 at 06:39:09PM -0400, Greg Smith wrote:
> The WAL logging of hint bits is where the scary stuff to me for this
> feature has always been at. My gut feel is that doing that needed to
> start being available as an option anyway. Just this month we've had
> two customer issues pop up where we had to look for block differences
> between a master and a standby. The security update forced some normal
> update stragglers to where they now have the 9.1.6 index corruption fix,
> and we're looking for cases where standby indexes might have been
> corrupted by it. In this case the comparisons can just avoid anything
> but indexes, so hint bits are thankfully not involved.
B-tree indexes have hints; see callers of ItemIdMarkDead().
--
Noah Misch
EnterpriseDB http://www.enterprisedb.com
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