| From: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
|---|---|
| To: | Greg Stark <gsstark(at)mit(dot)edu> |
| Cc: | Joshua Tolley <eggyknap(at)gmail(dot)com>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, Yeb Havinga <yebhavinga(at)gmail(dot)com>, Aidan Van Dyk <aidan(at)highrise(dot)ca>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Synchronous replication |
| Date: | 2010-08-09 21:00:47 |
| Message-ID: | 4C606C7F.3060308@enterprisedb.com |
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| Thread: | |
| Lists: | pgsql-hackers |
On 01/08/10 15:30, Greg Stark wrote:
> On Sun, Aug 1, 2010 at 7:11 AM, Heikki Linnakangas
> <heikki(dot)linnakangas(at)enterprisedb(dot)com> wrote:
>> I don't think any of this quorum stuff makes much sense without explicitly
>> registering standbys in the master.
>
> This doesn't have to be done manually. The streaming protocol could
> include the standby sending its system id to the master. The master
> could just keep a list of system ids with the last record they've been
> sent and the last they've confirmed receipt, fsync, application,
> whatever the protocol covers. If the same system reconnects it just
> overwrites the existing data for that system id.
Systemid doesn't work for that. Systemid is assigned at initdb time, so
all the standbys have the same systemid as the master.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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