From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
---|---|
To: | Michael Paquier <michael(at)paquier(dot)xyz> |
Cc: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Problem while setting the fpw with SIGHUP |
Date: | 2018-04-23 16:21:04 |
Message-ID: | CA+TgmoZJX89cdvYiz1Ybf9=270oLS0=oNxKrufOnt7nx+fhsFA@mail.gmail.com |
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On Wed, Apr 18, 2018 at 9:49 PM, Michael Paquier <michael(at)paquier(dot)xyz> wrote:
> On Wed, Apr 18, 2018 at 10:52:51AM -0400, Robert Haas wrote:
>> I would just document the risks. If the documentation says that you
>> can't rely on the value until after the next checkpoint, or whatever
>> the rule is, then I think we're fine. I don't think that we really
>> have the infrastructure to do any better; if we try, we'll just end up
>> with odd warts. Documenting the current set of warts is less churn
>> and less work.
>
> The last version of the patch proposed has eaten this diff which was
> part of one of the past versions (v2-0001-Change-FPW-handling.patch from
> https://www.postgresql.org/message-id/20180412.103430.133595350.horiguchi.kyotaro%40lab.ntt.co.jp):
> + The default is <literal>on</literal>. The change of the parameter takes
> + effect at the next checkpoint time.
> So there were some documentation about the beHavior change for what it's
> worth.
Fine, but that doesn't answer the question of whether we actually need
to or should change the behavior in the first place.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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