Date: Mon, 15 Jun 2015 22:14:20 -0300
From: Alvaro Herrera <alvherre@2ndquadrant.com>
To: "David G. Johnston" <david.g.johnston@gmail.com>
Cc: Euler Taveira <euler@timbira.com.br>, Jeff Janes <jeff.janes@gmail.com>,
 "pgsql-docs@postgresql.org" <pgsql-docs@postgresql.org>
Subject: Re: "Alter system" command documentation
Message-ID: <20150616011420.GP133018@postgresql.org>
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David G. Johnston wrote:
> On Mon, Jun 15, 2015 at 4:58 PM, Euler Taveira <euler@timbira.com.br> wrote:
> 
> > On 15-06-2015 13:32, Jeff Janes wrote:

> > > Isn't it unfortunate that the command used for changing the
> > > configuration file from within SQL mentions SIGHUP and pg_ctl
> > > reload, but not "select pg_reload_conf();", as a way to activate
> > > that change?
> > >
> > SIGHUP is an implementation detail. If I were to change that
> > sentence, my preference is replace SIGHUP with pg_reload_conf.
> 
> I disagree on SIGHUP being an implementation detail.  Using signals in
> IPC (inter-process communication) is a public API that should be
> documented when applicable.

Agreed.  However, I don't think it makes sense to document that either
SIGHUP, pg_ctl reload, and pg_reload_conf() can be used whenever a
parameter reload is mentioned; that would bloat too much (in a quick
grep, I see at least 10-15 places where SIGHUP or "reload" is mentioned
in the context of config files.)  Maybe we should have one section
somewhere, saying "reload is executed by any of the following:" and list
them all.  Then this place and others could simply say "these values are
effective after reload, about which see section X.Y.Z".

-- 
Álvaro Herrera                http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services


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