| From: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
|---|---|
| To: | Csaba Nagy <nagy(at)ecircle-ag(dot)com> |
| Cc: | Merlin Moncure <mmoncure(at)gmail(dot)com>, Gregory Stark <stark(at)enterprisedb(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Richard Huxton <dev(at)archonet(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Transaction Snapshots and Hot Standby |
| Date: | 2008-09-11 12:45:35 |
| Message-ID: | 48C912EF.4080804@enterprisedb.com |
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| Lists: | pgsql-hackers |
Csaba Nagy wrote:
> On Thu, 2008-09-11 at 15:23 +0300, Heikki Linnakangas wrote:
>> I'd imagine that even if applying the WAL on the slave is blocked, it's
>> still streamed from the master to the slave, and in case of failover the
>> slave will fast-forward before starting up as the new master.
>
> Which begs the question: what happens with a query which is running on
> the slave in the moment when the slave switches from recovery mode and
> starts up ? Should the running queries be canceled if they are blocking
> applying of WAL, to allow start-up, or let them finish ?
Depends on application, I'd say. I guess we'll need both, like the smart
and fast shutdown modes.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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