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Re: Changing the default wal_sync_method to open_sync for

From: "Marc G(dot) Fournier" <scrappy(at)postgresql(dot)org>
To: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
Cc: Dave Page <dpage(at)vale-housing(dot)co(dot)uk>,Magnus Hagander <mha(at)sollentuna(dot)net>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>,pgsql-hackers(at)postgresql(dot)org, pgsql-hackers-win32(at)postgresql(dot)org,Merlin Moncure <merlin(dot)moncure(at)rcsonline(dot)com>
Subject: Re: Changing the default wal_sync_method to open_sync for
Date: 2005-03-17 18:15:47
Message-ID: 20050317141328.Q954@ganymede.hub.org (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-hackers-win32
On Thu, 17 Mar 2005, Bruce Momjian wrote:

> Dave Page wrote:
>>> 2.  Another question is what to do with 8.0.X?  Do we
>>> backpatch this for
>>> Win32 performance?  Can we test it enough to know it will work well?
>>> 8.0.2 is going to have a more rigorous testing cycle because of the
>>> buffer manager changes.
>>
>> This question was asked earlier, and iirc, a few people said yes, and
>> no-one said no. I'm most definitely in the yes camp.
>
> I have backpatched O_SYNC for Win32 to 8.0.X.  Everyone seems to agree
> it should be supported by wal_sync_method.  --- the "default" issue
> still needs discussion.

Even with Magnus' explanation that we're talking Hardware, and not OS risk 
issues, I still think that the default should be the "least risky", with 
the other options being well explained from both a risk/performance 
standpoint, so that its a conscious decision on the admin's side ...

Any 'risk of data loss' has always been taboo, making the default 
behaviour be to increase that risk seems to be a step backwards to me .. 
having the option, fine ... effectively forcing that option is what I'm 
against (and, by forcing, I mean how many ppl "change from the default"?)


  ----
Marc G. Fournier           Hub.Org Networking Services (http://www.hub.org)
Email: scrappy(at)hub(dot)org           Yahoo!: yscrappy              ICQ: 7615664

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