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Re: machine-readable pg_controldata?

From: Joe Conway <mail(at)joeconway(dot)com>
To: Greg Smith <greg(at)2ndquadrant(dot)com>
Cc: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Magnus Hagander <magnus(at)hagander(dot)net>, Josh Berkus <josh(at)agliodbs(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: machine-readable pg_controldata?
Date: 2010-03-09 00:59:38
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
On 03/05/2010 10:28 AM, Greg Smith wrote:
> Heikki Linnakangas wrote:
>> Then again, if you don't use the copy in shared memory but just open the
>> pg_control file and read it in the UDF, you could implement this as a
>> pgfoundry module that works with older versions too.
> This is the direction I'd prefer to see this go in a 9.0 context.  It's
> easy enough to build a fully functional version that lives works via the
> same proposed final UDF interface, just with the extra step of reading
> the file.  Get that working, and you just added a useful module
> supporting all the way back to 8.2 (I think--not sure if there's been
> any other changes that would break this) that people would love to have.

FWIW, here is a quick and dirty effort:

It turns out some minor changes are needed for 8.4 or earlier as some
attributes have been added to ControlFileData. Once we get general
agreement I can do that too. I have not bothered to start a pgfoundry
project yet -- thoughts?


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