| From: | Nathan Bossart <nathandbossart(at)gmail(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | Andy Fan <zhihuifan1213(at)163(dot)com>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, Maxim Orlov <orlovmg(at)gmail(dot)com>, Pavel Borisov <pashkin(dot)elfe(at)gmail(dot)com>, "Bossart, Nathan" <bossartn(at)amazon(dot)com>, Maxim Orlov <m(dot)orlov(at)postgrespro(dot)ru>, pgsql-hackers(at)lists(dot)postgresql(dot)org |
| Subject: | Re: Pre-allocating WAL files |
| Date: | 2025-01-22 17:43:20 |
| Message-ID: | Z5EuOBav0sc_vG9c@nathan |
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| Lists: | pgsql-hackers |
On Wed, Jan 22, 2025 at 11:21:03AM -0500, Andres Freund wrote:
> fsync(open(oldname1));
> fsync(open(oldname2));
> ..
> fsync(open(oldnameN));
>
> rename(oldname1, newname1);
> rename(oldname2, newname2);
> ..
> rename(oldnameN, newnameN);
>
> fsync(open(newname1));
> fsync(open(newname2));
> ..
> fsync(open(newnameN));
>
> fsync(open("pg_wal"));
What is the purpose of syncing the file before the rename?
--
nathan
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