| From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
|---|---|
| To: | Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Markus Wanner <markus(at)bluegap(dot)ch>, Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Andrew Dunstan <andrew(at)dunslane(dot)net>, Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, MARK CALLAGHAN <mdcallag(at)gmail(dot)com>, Aidan Van Dyk <aidan(at)highrise(dot)ca>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Re: [COMMITTERS] pgsql: Efficient transaction-controlled synchronous replication. |
| Date: | 2011-03-18 21:30:04 |
| Message-ID: | 1300483804.18619.19321.camel@ebony |
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| Lists: | pgsql-committers pgsql-hackers |
On Fri, 2011-03-18 at 16:24 -0500, Kevin Grittner wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
>
> > Since the current solution is intended to support data-loss-free
> > failover, but NOT to guarantee a consistent view of the world from
> > a SQL level, I doubt it's worth paying any price for this.
>
> Well, that brings us back to the question of why we would want to
> suppress the view of the data on the master until the replica
> acknowledges the commit. It *is* committed on the master, we're
> just holding off on telling the committer about it until we can
> honor the guarantee of replication. If it can be seen on the
> replica before the committer get such acknowledgment, why not on the
> master?
I think the issue is explicit acknowledgement, not visibility.
--
Simon Riggs http://www.2ndQuadrant.com/books/
PostgreSQL Development, 24x7 Support, Training and Services
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