Re: Synchronous replication

On Sun, Aug 1, 2010 at 9:30 PM, Greg Stark <gsstark@mit.edu> wrote:
> This doesn't have to be done manually.

Agreed, if we register standbys in the master.

> 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.

Since every standby has the same system id, we cannot distinguish
them by that id. ISTM that the master should assign the unique id
for each standby, and they should save it in pg_control.

Regards,

-- 
Fujii Masao
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center