From: | Peter Geoghegan <pg(at)bowt(dot)ie> |
---|---|
To: | "Wong, Yi Wen" <yiwong(at)amazon(dot)com> |
Cc: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, "Wood, Dan" <hexpert(at)amazon(dot)com>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Robert Haas <robertmhaas(at)gmail(dot)com> |
Subject: | Re: [COMMITTERS] pgsql: Fix freezing of a dead HOT-updated tuple |
Date: | 2017-10-06 22:15:07 |
Message-ID: | CAH2-Wzn72rWQ52p=PuZ1KLHQaGD+sGd8DoKLfsPY=xSziVukyg@mail.gmail.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-committers pgsql-hackers |
On Fri, Oct 6, 2017 at 2:09 PM, Wong, Yi Wen <yiwong(at)amazon(dot)com> wrote:
> Yesterday, I've been spending time with pg_visibility on the pages when I reproduce the issue in 9.6.
> None of the all-frozen or all-visible bits are necessarily set in problematic pages.
Since this happened yesterday, I assume it was with an unfixed version?
As you must have seen, Alvaro said he has a variant of Dan's original
script that demonstrates that a problem remains, at least on 9.6+,
even with today's fix. I think it's the stress-test that plays with
fillfactor, many clients, etc [1].
I've tried to independently reproduce the problem on the master
branch's current tip, with today's new fix, but cannot break things
despite trying many variations. I cannot reproduce the problem that
Alvaro still sees.
I'll have to wait until Alvaro posts his repro to the list before
commenting further, which I assume he'll post as soon as he can. There
doesn't seem to be much point in not waiting for that.
[1] https://postgr.es/m/20171005162402.jahqflf3mekileqm@alvherre.pgsql
--
Peter Geoghegan
From | Date | Subject | |
---|---|---|---|
Next Message | Tom Lane | 2017-10-06 23:19:20 | pgsql: Fix crash when logical decoding is invoked from a PL function. |
Previous Message | Wong, Yi Wen | 2017-10-06 21:09:12 | Re: [COMMITTERS] pgsql: Fix freezing of a dead HOT-updated tuple |
From | Date | Subject | |
---|---|---|---|
Next Message | Adam Brusselback | 2017-10-07 01:33:16 | Discussion on missing optimizations |
Previous Message | Wong, Yi Wen | 2017-10-06 21:09:12 | Re: [COMMITTERS] pgsql: Fix freezing of a dead HOT-updated tuple |