Re: open items for 9.4

From: Andres Freund <andres(at)2ndquadrant(dot)com>
To: Josh Berkus <josh(at)agliodbs(dot)com>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Bruce Momjian <bruce(at)momjian(dot)us>, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, Peter Geoghegan <pg(at)heroku(dot)com>, Claudio Freire <klaussfreire(at)gmail(dot)com>, "David E(dot) Wheeler" <david(at)justatheory(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>, Andrew Dunstan <andrew(at)dunslane(dot)net>, Jan Wieck <jan(at)wi3ck(dot)info>
Subject: Re: open items for 9.4
Date: 2014-09-29 18:30:01
Message-ID: 20140929183001.GA14400@awork2.anarazel.de
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On 2014-09-29 11:28:07 -0700, Josh Berkus wrote:
> On 09/29/2014 08:53 AM, Andres Freund wrote:
> >> - Remove xloginsert_slots/xloginsert_locks GUC - Not yet!!
> >> >
> >> > The text seems to indicate that there's some disagreement on this
> >> > point. I don't have a strong opinion on whether or not to keep the
> >> > GUC, but if we're going to remove it it should probably happen before
> >> > beta3. It's going to be impossible to remove once we've released with
> >> > it, I suspect.
> > I vote for keeping it.
>
> Time for me to put on my "we have too many darned GUCs" curmudgeon hat.
>
> 1. What does it do?

Change scalability in write heavy loads.

> 2. Are there reasons why users would want to change it from the
> default?

Yes, to improve scalability.

> 3. Can we explain those reasons in the form of documentation?

Yes. Try and benchmark it. It'll be hardware and workload dependant.

Greetings,

Andres Freund

--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services

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