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From: Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>
To: Simon Riggs <simon@2ndQuadrant.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Gregory Stark <stark@enterprisedb.com>
Cc: ITAGAKI Takahiro <itagaki.takahiro@oss.ntt.co.jp>
Cc: pgsql-hackers@postgresql.org
Subject: Re: rmgr hooks and contrib/rmgr_hook
Date: Mon, 15 Sep 2008 17:01:59 +0300
Message-ID: <48CE6AD7.1070605@enterprisedb.com> (raw)
In-Reply-To: <1221485063.3913.1350.camel@ebony.2ndQuadrant>
References: <20080901121833.4A18.52131E4D@oss.ntt.co.jp>
	<1220345064.4371.275.camel@ebony.2ndQuadrant>
	<20080902174613.76B2.52131E4D@oss.ntt.co.jp>
	<1220348980.4371.316.camel@ebony.2ndQuadrant>
	<14451.1220369969@sss.pgh.pa.us>
	<1220372673.4371.465.camel@ebony.2ndQuadrant>
	<48CB72C8.1070700@enterprisedb.com>
	<1221470800.3913.1229.camel@ebony.2ndQuadrant>
	<87sks1oi4o.fsf@oxford.xeocode.com>
	<24006.1221483138@sss.pgh.pa.us>
	<1221485063.3913.1350.camel@ebony.2ndQuadrant>

Simon Riggs wrote:
> On Mon, 2008-09-15 at 08:52 -0400, Tom Lane wrote:
>> I've never heard of anyone building a non-core index AM at all; much
>> less trying to use it in a production context.  Given the obvious
>> potential for version-mismatch-type problems, it's hard to believe
>> that anyone ever would try.
> 
> The lack of a chicken is not an argument against the use case for an
> egg.
> 
> But in any case, Bizgres was exactly this case, so they already did. We
> just forced the authors to produce a code fork to do it, confusing
> people rather than attracting people to Postgres.

Are you referring to the bitmap index patch? IIRC, there was some 
non-trivial changes to indexam API in there, as well as issues with 
VACUUM. If anything, that patch supports the assumption that anything 
that needs WAL-logging is working at such a low-level that it needs to 
be in core anyway.

-- 
   Heikki Linnakangas
   EnterpriseDB   http://www.enterprisedb.com



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