From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
Cc: | Gurjeet Singh <singh(dot)gurjeet(at)gmail(dot)com>, Greg Smith <gsmith(at)gregsmith(dot)com>, "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>, Andrew Dunstan <andrew(at)dunslane(dot)net>, Robert Treat <xzilla(at)users(dot)sourceforge(dot)net>, pgsql-hackers(at)postgresql(dot)org, Bruce Momjian <bruce(at)momjian(dot)us>, David Fetter <david(at)fetter(dot)org>, Josh Berkus <josh(at)agliodbs(dot)com>, Marko Kreen <markokr(at)gmail(dot)com> |
Subject: | Re: Core team statement on replication in PostgreSQL |
Date: | 2008-05-30 14:46:19 |
Message-ID: | 3595.1212158779@sss.pgh.pa.us |
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Simon Riggs <simon(at)2ndquadrant(dot)com> writes:
> On Fri, 2008-05-30 at 12:31 +0530, Gurjeet Singh wrote:
>> On Fri, May 30, 2008 at 10:40 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>>> But since you mention it: one of the plausible answers for fixing the
>>> vacuum problem for read-only slaves is to have the slaves push an xmin
>>> back upstream to the master to prevent premature vacuuming.
>>
>> I think it would be best to not make the slave interfere with the
>> master's operations; that's only going to increase the operational
>> complexity of such a solution.
> We ruled that out as the-only-solution a while back. It does have the
> beauty of simplicity, so it may exist as an option or possibly the only
> way, for 8.4.
Yeah. The point is that it's fairly clear that we could make that work.
A solution that doesn't impact the master at all would be nicer, but
it's not at all clear to me that one is possible, unless we abandon
WAL-shipping as the base technology.
regards, tom lane
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