| 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 |
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| Lists: | pgsql-committers pgsql-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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