| From: | Nathan Bossart <nathandbossart(at)gmail(dot)com> |
|---|---|
| To: | Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com> |
| Cc: | tgl(at)sss(dot)pgh(dot)pa(dot)us, robertmhaas(at)gmail(dot)com, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: avoid multiple hard links to same WAL file after a crash |
| Date: | 2022-04-12 16:27:42 |
| Message-ID: | 20220412162742.GB2062175@nathanxps13 |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
On Tue, Apr 12, 2022 at 03:46:31PM +0900, Kyotaro Horiguchi wrote:
> At Mon, 11 Apr 2022 09:52:57 -0700, Nathan Bossart <nathandbossart(at)gmail(dot)com> wrote in
>> I traced this back a while ago. I believe the link() was first added in
>> November 2000 as part of f0e37a8. This even predates WAL recycling, which
>> was added in July 2001 as part of 7d4d5c0.
>
> f0e37a8 lacks discussion.. It introduced the CHECKPOINT command from
> somwhere out of the ML.. This patch changed XLogFileInit to
> supportusing existent files so that XLogWrite can use the new segment
> provided by checkpoint and still allow XLogWrite to create a new
> segment by itself.
Yeah, I've been unable to find any discussion besides a brief reference to
adding checkpointing [0].
[0] https://postgr.es/m/8F4C99C66D04D4118F580090272A7A23018D85%40sectorbase1.sectorbase.com
--
Nathan Bossart
Amazon Web Services: https://aws.amazon.com
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