Re: Sync Rep v19

From: Simon Riggs <simon(at)2ndQuadrant(dot)com>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Sync Rep v19
Date: 2011-03-05 12:49:46
Message-ID: 1299329386.10703.11610.camel@ebony
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On Sat, 2011-03-05 at 07:24 -0500, Robert Haas wrote:
> On Sat, Mar 5, 2011 at 6:04 AM, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:
> > It is documented that the selection of standby from a set of similar
> > priorities is indeterminate. Users don't like it, they can change it.
>
> That doesn't seem like a good argument to *change* the synchronous
> standby once it's already set.

If the order is arbitrary, why does it matter if it changes?

The user has the power to specify a sequence, yet they have not done so.
They are told the results are indeterminate, which is accurate. I can
add the words "and may change as new standbys connect" if that helps.

--
Simon Riggs http://www.2ndQuadrant.com/books/
PostgreSQL Development, 24x7 Support, Training and Services

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