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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Simon Riggs <simon@2ndQuadrant.com>
Cc: List pgsql-patches <pgsql-patches@postgresql.org>
Cc: pgsql-hackers <pgsql-hackers@postgresql.org>
Subject: Re: [PATCHES] Infrastructure changes for recovery
Date: Mon, 29 Sep 2008 08:46:46 -0400
Message-ID: <10307.1222692406@sss.pgh.pa.us> (raw)
In-Reply-To: <1222691596.4445.1188.camel@ebony.2ndQuadrant>
References: <1218109459.4549.423.camel@ebony.2ndQuadrant>
	<1220213074.4371.173.camel@ebony.2ndQuadrant>
	<1905.1220895241@sss.pgh.pa.us>
	<1221080797.3913.768.camel@ebony.2ndQuadrant>
	<15776.1221594318@sss.pgh.pa.us>
	<1221725145.3913.2315.camel@ebony.2ndQuadrant>
	<16992.1221743196@sss.pgh.pa.us>
	<1221745847.3913.2408.camel@ebony.2ndQuadrant>
	<18549.1221746983@sss.pgh.pa.us>
	<1222121161.4445.248.camel@ebony.2ndQuadrant>
	<1222184541.4445.400.camel@ebony.2ndQuadrant>
	<28973.1222381719@sss.pgh.pa.us>
	<1222424415.4445.917.camel@ebony.2ndQuadrant>
	<9794.1222624945@sss.pgh.pa.us>
	<1222649659.4445.1061.camel@ebony.2ndQuadrant>
	<22856.1222650961@sss.pgh.pa.us>
	<1222691596.4445.1188.camel@ebony.2ndQuadrant>

Simon Riggs <simon@2ndQuadrant.com> writes:
> ... That kinda works, but the problem is that restartpoints are time based,
> not log based. We need them to be deterministic for us to rely upon them
> in the above way.

Right, but the performance disadvantages of making them strictly
log-distance-based are pretty daunting.  We don't really want slaves
doing that while they're in catchup mode.

			regards, tom lane

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