Horton

Re: Configuring synchronous replication

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Robert Haas <robertmhaas@gmail.com>
Cc: jd@commandprompt.com, Thom Brown <thom@linux.com>, Bruce Momjian <bruce@momjian.us>, Andrew Dunstan <andrew@dunslane.net>, Dave Page <dpage@pgadmin.org>, Peter Eisentraut <peter_e@gmx.net>, Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>, Fujii Masao <masao.fujii@gmail.com>, Josh Berkus <josh@agliodbs.com>, pgsql-hackers@postgresql.org
Date: 2010-09-22T17:26:18Z
Lists: pgsql-hackers 
Robert Haas <robertmhaas@gmail.com> writes:
> On Wed, Sep 22, 2010 at 1:09 PM, Joshua D. Drake <jd@commandprompt.com> wrote:
>> On Wed, 2010-09-22 at 13:00 -0400, Robert Haas wrote:
>>> But it CAN'T be a system catalog, because, among other problems, that
>>> rules out cascading slaves, which are a feature a lot of people
>>> probably want to eventually have.
>> 
>> I guarantee you there is a way around the cascade slave problem.

> And that would be...?

Indeed.  If it's a catalog then it has to be exactly the same on the
master and every slave; which is probably a constraint we don't want
for numerous reasons, not only cascade arrangements.

			regards, tom lane