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Re: scheduler in core

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Simon Riggs <simon(at)2ndquadrant(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Dimitri Fontaine <dfontaine(at)hi-media(dot)com>, Dave Page <dpage(at)pgadmin(dot)org>, Jaime Casanova <jcasanov(at)systemguards(dot)com(dot)ec>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: scheduler in core
Date: 2010-02-21 18:13:46
Message-ID: 603c8f071002211013s27086c47l4e9cf1f53d033c89@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On Sun, Feb 21, 2010 at 1:11 PM, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:
> On Sat, 2010-02-20 at 18:19 -0500, Tom Lane wrote:
>> Dimitri Fontaine <dfontaine(at)hi-media(dot)com> writes:
>> > Dave Page <dpage(at)pgadmin(dot)org> writes:
>> >> Why not just use pgAgent? It's far more flexible than the design
>> >> you've suggested, and already exists.
>>
>> > What would it take to have it included in core,
>>
>> I don't think this really makes sense.  There's basically no argument
>> for having it in core other than "I'm too lazy to install a separate
>> package".  Unlike the case for autovacuum, there isn't anything an
>> in-core implementation could do that an external one doesn't do as well
>> or better.  So I'm not eager to take on additional maintenance burden
>> for such a thing.
>
> There is currently no way to run a separate daemon process that runs
> user code as part of Postgres, so that the startup code gets run
> immediately we startup, re-run if we crash and shut down cleanly when
> the server does.

Good point.

> If there were some way to run arbitrary code in a
> daemon using an extensibility API then we wouldn't ever get any requests
> for the scheduler, cos you could write it yourself without troubling
> anybody here.

That might be a little overly optimistic, but I get the point.

...Robert

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