| From: | Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de>, Mark Dilger <hornschnorter(at)gmail(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Craig Ringer <craig(at)2ndquadrant(dot)com>, Anthony Iliopoulos <ailiop(at)altatus(dot)com>, Greg Stark <stark(at)mit(dot)edu>, Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>, Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk>, Bruce Momjian <bruce(at)momjian(dot)us>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Catalin Iacob <iacobcatalin(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: PostgreSQL's handling of fsync() errors is unsafe and risks data loss at least on XFS |
| Date: | 2018-04-09 21:25:52 |
| Message-ID: | 465156c1-f398-05fe-320e-75806350e9f3@2ndquadrant.com |
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| Lists: | pgsql-hackers |
On 04/09/2018 11:08 PM, Andres Freund wrote:
> Hi,
>
> On 2018-04-09 13:55:29 -0700, Mark Dilger wrote:
>> I can also imagine a master and standby that are similarly provisioned,
>> and thus hit an out of disk error at around the same time, resulting in
>> corruption on both, even if not the same corruption.
>
> I think it's a grave mistake conflating ENOSPC issues (which we should
> solve by making sure there's always enough space pre-allocated), with
> EIO type errors. The problem is different, the solution is different.
>
In any case, that certainly does not count as data corruption spreading
from the master to standby.
--
Tomas Vondra http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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