| From: | Andres Freund <andres(at)2ndquadrant(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Simon Riggs <simon(at)2ndquadrant(dot)com>, Peter Geoghegan <pg(at)heroku(dot)com>, Noah Misch <noah(at)leadboat(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: ALTER TABLE lock strength reduction patch is unsafe |
| Date: | 2014-01-28 17:46:10 |
| Message-ID: | 20140128174610.GE18333@awork2.anarazel.de |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
On 2014-01-27 15:25:22 -0500, Robert Haas wrote:
> On Mon, Jan 27, 2014 at 12:58 PM, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:
> > This version adds a GUC called ddl_exclusive_locks which allows us to
> > keep the 9.3 behaviour if we wish it. Some people may be surprised
> > that their programs don't wait in the same places they used to. We
> > hope that is a positive and useful behaviour, but it may not always be
> > so.
> >
> > I'll commit this on Thurs 30 Jan unless I hear objections.
>
> I haven't reviewed the patch, but -1 for adding a GUC.
Dito. I don't think the patch in a bad shape otherwise. I'd very quickly
looked at a previous version and it did look rather sane, and several
other people had looked at earlier versions as well. IIRC Noah had a
fairly extensive look at some intricate race conditions...
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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