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From: Simon Riggs <simon@2ndQuadrant.com>
To: Fujii Masao <masao.fujii@gmail.com>
Cc: Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>
Cc: Aidan Van Dyk <aidan@highrise.ca>
Cc: PostgreSQL-development <pgsql-hackers@postgresql.org>
Subject: Re: Re: [COMMITTERS] pgsql: Make standby server continuously retry restoring the next WAL
Date: Fri, 19 Mar 2010 08:52:04 +0000
Message-ID: <1268988724.3556.3.camel@ebony> (raw)
In-Reply-To: <3f0b79eb1003180727g7877743eq81274e014fe70a49@mail.gmail.com>
References: <3f0b79eb1002092105r21e009d3v468496058ba04392@mail.gmail.com>
	<4B73FB99.4080403@enterprisedb.com>
	<1265893599.7341.1454.camel@ebony>
	<4B740613.5090004@enterprisedb.com>
	<20100211140118.GB14128@oak.highrise.ca>
	<4B74118C.30704@enterprisedb.com>
	<20100211144204.GC14128@oak.highrise.ca>
	<4B743E7D.5070603@enterprisedb.com>
	<3f0b79eb1002180337t1fab1395ve3491256672af15f@mail.gmail.com>
	<4BA0B079.3050301@enterprisedb.com>
	<3f0b79eb1003180727g7877743eq81274e014fe70a49@mail.gmail.com>

On Thu, 2010-03-18 at 23:27 +0900, Fujii Masao wrote:

> I agree that this is a bigger problem. Since the standby always starts
> walreceiver before replaying any WAL files in pg_xlog, walreceiver tries
> to receive the WAL files following the REDO starting point even if they
> have already been in pg_xlog. IOW, the same WAL files might be shipped
> from the primary to the standby many times. This behavior is unsmart,
> and should be addressed.

We might also have written half a file many times. The files in pg_xlog
are suspect whereas the files in the archive are not. If we have both we
should prefer the archive.

-- 
 Simon Riggs           www.2ndQuadrant.com




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