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Re: [PATCH] XLogReader v2

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Andres Freund <andres(at)2ndquadrant(dot)com>
Cc: Satoshi Nagayasu <snaga(at)uptime(dot)jp>, pgsql-hackers(at)postgresql(dot)org, Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, satoshi(dot)nagayasu(at)gmail(dot)com
Subject: Re: [PATCH] XLogReader v2
Date: 2012-07-23 15:11:20
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
On Mon, Jul 23, 2012 at 11:04 AM, Andres Freund <andres(at)2ndquadrant(dot)com> wrote:
> On Monday, July 23, 2012 04:17:39 PM Robert Haas wrote:
>> On Mon, Jul 23, 2012 at 3:19 AM, Andres Freund <andres(at)2ndquadrant(dot)com>
> wrote:
>> > On Thursday, July 19, 2012 07:18:08 PM Satoshi Nagayasu wrote:
>> >> I agree with that we need more sophisticated way to share the code
>> >> between the backend and several utilities (including xlogdump),
>> >> but AFAIK, a contrib module must allow to be built *without* the core
>> >> source tree.
>> >
>> > I don't think thats reasonable. The amount of code duplication required
>> > to support that usecase is just not reasonable. Especially if you want
>> > to support pre 9.3 and 9.3+.
>> It seems like the direction this is going is that the xlog reading
>> stuff should be a library which is used by both the backend and 1 or
>> more xlog decoding tools.
> Thats fine for the xlogreader itself - it only uses stuff from headers. The
> problem is that the xlog debugging/printing infrastructure is pretty much
> guaranteed to include just about the whole backend...

Could that be fixed by moving the debugging routines into a separate
set of files, instead of having them lumped in with the code that
applies those xlog records?

Robert Haas
The Enterprise PostgreSQL Company

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