| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Andres Freund <andres(at)anarazel(dot)de>, Daniel Gustafsson <daniel(at)yesql(dot)se>, Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>, deniel1495(at)mail(dot)ru, Ibrar Ahmed <ibrar(dot)ahmad(at)gmail(dot)com>, tejeswarm(at)hotmail(dot)com, hlinnaka <hlinnaka(at)iki(dot)fi>, Masahiko Sawada <masahiko(dot)sawada(at)2ndquadrant(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>, Daniel Wood <hexexpert(at)comcast(dot)net> |
| Subject: | Re: Corruption during WAL replay |
| Date: | 2022-03-25 14:13:28 |
| Message-ID: | CA+TgmoaH=6MJtcqN44geA6uQqt1PCHg-2UvehScAxSmsUm4KVA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, Mar 25, 2022 at 10:02 AM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> > On Fri, Mar 25, 2022 at 9:49 AM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> >> That'll just reduce the probability of failure, not eliminate it.
>
> > I mean, if the expected time to the first failure on even 1 machine
> > exceeds the time until the heat death of the universe by 10 orders of
> > magnitude, it's probably good enough.
>
> Adding another 16 bits won't get you to that, sadly. Yeah, it *might*
> extend the MTTF to more than the project's likely lifespan, but that
> doesn't mean we couldn't get unlucky next week.
I suspect that the number of bits Andres wants to add is no less than 48.
--
Robert Haas
EDB: http://www.enterprisedb.com
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