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From: Stefan Kaltenbrunner <stefan@kaltenbrunner.cc>
To: Simon Riggs <simon@2ndQuadrant.com>
Cc: Robert Treat <rob@xzilla.net>
Cc: pgsql-hackers@postgresql.org
Subject: Re: Sync Rep Design
Date: Thu, 30 Dec 2010 22:08:50 +0100
Message-ID: <4D1CF4E2.5000208@kaltenbrunner.cc> (raw)
In-Reply-To: <1293742878.1892.26205.camel@ebony>
References: <1293729972.1892.23804.camel@ebony>
	<4D1CC47E.7050207@kaltenbrunner.cc>
	<1293735853.1892.24886.camel@ebony>
	<AANLkTi=dr9TuYRLMWjPkJdL1Jjg+TAJXPJQbLGiN1Pag@mail.gmail.com>
	<1293741390.1892.25918.camel@ebony>
	<AANLkTim3mEVaP9eJsqticw600sSomHhJgsQVgjoDxASA@mail.gmail.com>
	<1293742878.1892.26205.camel@ebony>

On 12/30/2010 10:01 PM, Simon Riggs wrote:
> On Thu, 2010-12-30 at 15:51 -0500, Robert Treat wrote:
>
>> Still, one thing that has me concerned is that in the case of two
>> slaves, you don't know which one is the more up-to-date one if you
>> need to failover. It'd be nice if you could just guarantee they both
>> are...
>
> Regrettably, nobody can know that, without checking.

how exactly would you check? - this seems like something that needs to 
be done from the SQL and the CLI level and also very well documented 
(which I cannot see in your proposal).



Stefan




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