From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
---|---|
To: | Dimitri Fontaine <dfontaine(at)hi-media(dot)com> |
Cc: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Andrew Dunstan <andrew(at)dunslane(dot)net>, Greg Stark <gsstark(at)mit(dot)edu>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Command to prune archive at restartpoints |
Date: | 2010-06-13 18:25:53 |
Message-ID: | AANLkTil_zwXnjwqRFIu30T3I8CaoJYFmURmrrBwQ_pE5@mail.gmail.com |
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Lists: | pgsql-hackers |
On Sun, Jun 13, 2010 at 1:04 PM, Dimitri Fontaine
<dfontaine(at)hi-media(dot)com> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>> I'm a bit perplexed here. The archive cleanup has to run on the
>> standby, not the master, right? Whereas pg_switch_xlog() can only run
>> on the master.
>
> I used it just to show a possible use case, easy to grasp. Sorry if
> that's confusing instead.
>
>> The purpose of making this a standalone executable is
>> so that people who have, for example, multiple standbys, can customize
>> the logic without having to hack the backend. Pushing this into the
>> backend would defeat that goal; plus, it wouldn't be usable at all for
>> people who aren't running Hot Standby.
>
> In the simple cases, what you want to be able to easily choose is just
> the first XLOG file you're NOT cleaning. And this is the only argument
> you give the function.
>
> So you can either use the backend function as your internal command for
> archive cleanup, or use a script that choose where to stop cleaning then
> call it with that as an argument (it's SQL callable).
>
> What it does is unlink the file. If that behavior doesn't suit you, it's
> still possible to use an external command and tune some already proposed
> scripts. I just don't see how an external binary has more to offer than
> a backend function here. It's more code to maintain, it's harder to
> setup for people, and if it does not suit you, you still have to make
> you own script but you can not use what we ship easily (you have to get
> the sources and code in C for that).
>
> What I'm after is being able to tell people to just setup a GUC to a
> given value, not to copy/paste a (perl or bash) script from the docs,
> make it executable under their system, then test it and run it in
> production. We can do better than that, and it's not even hard.
We're not going to make them cut/paste anything from the docs. We're
going to provide a production-ready executable they can just use,
which should be installed (presumably, already with the correct
permissions) by their packaging system if they install
postgresql-contrib or the equivalent.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise Postgres Company
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