Re: Insufficient locking for ALTER DEFAULT PRIVILEGES

On 2015-06-21 11:45:24 -0300, Alvaro Herrera wrote:
> Alvaro Herrera wrote:
> 
> > Now that I actually check with a non-relation object, I see pretty much
> > the same error.  So probably if instead of some narrow bug fix what we
> > need is some general solution for all object types.  I know this has
> > been discussed a number of times ...  Anyway I see now that we should
> > not consider this a backpatchable bug fix, and I'm not doing the coding
> > either, at least not now.
> 
> Discussed this with a couple of 2ndQ colleagues and it became evident
> that MVCC catalog scans probably make this problem much more prominent.
> So historical branches are not affected all that much, but it's a real
> issue on 9.4+.

Hm. I don't see how those would make a marked difference. The snapshot
for catalogs scan are taken afresh for each scan (unless
cached). There'll probably be some difference, but it'll be small.

Andres