From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Andres Freund <andres(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: | 2014-03-03 16:22:55 |
Message-ID: | CA+U5nMJYqDrL59rLVB08J0byy-PeZOaOX7h=4Av+MVQy-PdP5A@mail.gmail.com |
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Lists: | pgsql-hackers |
On 3 March 2014 15:53, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Simon Riggs <simon(at)2ndQuadrant(dot)com> writes:
>> On 3 March 2014 15:19, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
>>> What I'm
>>> really concerned about is whether there are other things like the
>>> SnapshotNow issues that can cause stuff to halt and catch fire. I
>>> don't know whether there are or are not, but that's my concern.
>
>> Of course its a concern, I feel it also. But that's why we have beta
>> period to handle the unknowns.
>
> I have exactly zero faith that beta testing would catch low-probability
> problems in this area. What's needed, and hasn't happened AFAIK, is
> detailed study of the patch by assorted senior hackers.
>
>> The question is are there any specific areas of concern here? If not,
>> then we commit because we've done a lot of work on it and at the
>> moment the balance is high benefit to users against a non-specific
>> feeling of risk.
>
> This is backwards. The default decision around here has never been
> to commit when in doubt.
I'm not in doubt.
If anybody can give me some more pointers of things to look at, I will.
But I've looked and I can't see anything more.
--
Simon Riggs http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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