Re: Load Balancing / Failover cluster

Amitabh Kumar wrote:
> We have to develop an application for one of our clients. We are considering
> using PostgreSQL as the database. However, reliablity and scaliblity are
> key consideration. So before we go the PostgreSQL way, I would like to be
> sure that it supports the following features.
>
> 1. Load balancing using more that 2 server in active-active mode. It should
> be transparent to the client application. We should be able to add server
> as and when needed as growth is still unpredictable.
>
> 2. Failover, where one server takes up the load in case of failover of a
> server in the active-active cluster. Loss of last uncomitted transaction is
> acceptable but the client application should not have to restablish connection.

I've recently (accidentally) found the following piece of
software (I wonder why it's not mentioned on postgresql.org):

http://www.csra.co.jp/~mitani/jpug/pgcluster/en/

It's is a modified version of PostgreSQL (i.e. a patchset)
supporting multi-master synchronous replication. According
to the description, it might be exactly what you're looking
for.

Best regards
Oliver

--
Oliver Fromme, secnetix GmbH & Co KG, Oettingenstr. 2, 80538 München
Any opinions expressed in this message may be personal to the author
and may not necessarily reflect the opinions of secnetix in any way.

"It combines all the worst aspects of C and Lisp: a billion different
sublanguages in one monolithic executable. It combines the power of C
with the readability of PostScript."
-- Jamie Zawinski, when asked: "What's wrong with perl?"