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Re: Re: [COMMITTERS] pgsql: Efficient transaction-controlled synchronous replication.

From: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>
To: Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>
Cc: Simon Riggs <simon(at)2ndQuadrant(dot)com>, MARK CALLAGHAN <mdcallag(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>, 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 15:47:46
Message-ID: 4D837EA2.2070205@enterprisedb.com (view raw or flat)
Thread:
Lists: pgsql-committerspgsql-hackers
On 18.03.2011 16:52, Kevin Grittner wrote:
> Simon Riggs<simon(at)2ndQuadrant(dot)com>  wrote:
>
>> In PostgreSQL other users cannot observe the commit until an
>> acknowledgement has been received.
>
> Really?  I hadn't picked up on that.  That makes for a lot of
> complication on crash-and-recovery of a master, but if we can pull
> it off, that's really cool.  If we do that and MySQL doesn't, we
> definitely don't want to use the same terminology they do, which
> would imply the same behavior.

To be clear: other users cannot observe the commit until standby 
acknowledges it - unless the master crashes while waiting for the 
acknowledgment. If that happens, the commit will be visible to everyone 
after recovery.

-- 
   Heikki Linnakangas
   EnterpriseDB   http://www.enterprisedb.com

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