| From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | Jerry Jelinek <jerry(dot)jelinek(at)joyent(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: patch to allow disable of WAL recycling |
| Date: | 2018-08-22 14:41:16 |
| Message-ID: | 20180822144116.kc7b6urjxatk6kf6@alvherre.pgsql |
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| Lists: | pgsql-hackers |
On 2018-Aug-22, Andres Freund wrote:
> On 2018-08-22 11:06:17 -0300, Alvaro Herrera wrote:
> > I suppose that the use case that was initially proposed (ZFS) has not
> > yet been tested so we shouldn't reject this patch immediately, but
> > perhaps what Joyent people should be doing now is running Tomas' test
> > script on ZFS and see what the results look like.
>
> IDK, I would see it less negatively. Yes, we should put a BIG FAT
> warning to never use this on non COW filesystems. And IMO ZFS (and also
> btrfs) sucks badly here, even though they really shouldn't. But given
> the positive impact for zfs & btrfs, and the low code complexity, I
> think it's not insane to provide this tunable.
Yeah, but let's see some ZFS numbers first :-)
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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