From: | Andres Freund <andres(at)2ndquadrant(dot)com> |
---|---|
To: | Peter Geoghegan <pg(at)heroku(dot)com> |
Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: INSERT...ON DUPLICATE KEY LOCK FOR UPDATE |
Date: | 2013-12-24 12:09:01 |
Message-ID: | 20131224120901.GD26564@alap2.anarazel.de |
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Thread: | |
Lists: | pgsql-hackers |
On 2013-12-23 14:59:31 -0800, Peter Geoghegan wrote:
> On Mon, Dec 23, 2013 at 7:49 AM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> > I don't think this is a project to rush through. We've lived without
> > MERGE/UPSERT for several years now, and we can live without it for
> > another release cycle while we try to reach agreement on the way
> > forward.
Agreed, but I really think it's one of the biggest weaknesses of
postgres at this point.
> > I can tell that you're convinced you know the right way
> > forward here, and you may be right, but I don't think you've convinced
> > everyone else - maybe not even anyone else.
> That may be. Attention from reviewers has been in relatively short
> supply. Not that that isn't always true.
I don't really see the lack of review as being crucial at this point. At
least I have quite some doubts about the approach you've chosen and I
have voiced it - so have others. Whether yours is workable seems to
hinge entirely on whether you can build a scalable, maintainable
value-locking scheme. Besides some thoughts about using slru.c for it I
haven't seen much about the design of that part - might just have missed
it though. Personally I can't ad-lib a design for it, but I haven't
though about it too much.
I don't think there's too much reviewers can do before you've provided a
POC implementation of real value locking.
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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