| From: | "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov> |
|---|---|
| To: | "Simon Riggs" <simon(at)2ndquadrant(dot)com>, "Robert Haas" <robertmhaas(at)gmail(dot)com> |
| Cc: | "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 16:48:57 |
| Message-ID: | 4D8346A9020000250003BAC3@gw.wicourts.gov |
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| Lists: | pgsql-committers pgsql-hackers |
Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:
>> No, only in the case where you choose not to failover to the
>> standby when you crash, which would be a fairly strange choice
>> after the effort to set up the standby. In a correctly configured
>> and operated cluster what I say above is fully correct and needs
>> no addendum.
> what do you do if a meteor hits the synchronous standby and at the
> same time you lose power to the master? No amount of
> configuration will save you from coming back on line with a
> visible-but-unreplicated transaction.
You don't even need to postulate an extreme condition like that; we
prefer to have a DBA pull the trigger on a failover, rather than
trust the STONITH call to software. This is particularly true when
the master is local to its primary users and the replica is remote
to them.
-Kevin
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