| From: | Peter Geoghegan <pg(at)bowt(dot)ie> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
| Cc: | "Wood, Dan" <hexpert(at)amazon(dot)com>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, "Wong, Yi Wen" <yiwong(at)amazon(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [COMMITTERS] pgsql: Fix freezing of a dead HOT-updated tuple |
| Date: | 2017-10-06 17:03:51 |
| Message-ID: | CAH2-Wz=-eBQTEAfb_vnzMpYqH0EGEiohcYSmc=ykH_Y9fNywww@mail.gmail.com |
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On Fri, Oct 6, 2017 at 6:18 AM, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> wrote:
> Wood, Dan wrote:
>> Yes, I’ve been testing 9.6. I’ll try Alvaro’s patch today.
>>
>> I would prefer to focus on either latest 9X or 11dev.
>
> I tested my patch on 9.4 and 9.5 today and it seems to close the problem
> (with the patch, I waited 10x as many iterations as it took for the
> problem to occur ~10 times without the patch), but I can reproduce a
> problem in 9.6 with my patch installed. There must be something new in
> 9.6 that is causing the problem to reappear.
What problem persists? The original one (or, at least, the original
symptom of pruning HOT chains incorrectly)? If that's what you mean, I
wouldn't be so quick to assume that it's the freeze map.
--
Peter Geoghegan
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