Mark,
there is interesting project DBBalancer
(http://www.sourceforge.net/projects/dbbalancer)
which claims:
DBBalancer is some sort of middleware that would sit in between of database
clients, like C, C++, TCL, Java JDBC, Perl DBI, and a database server.
Currently the only server supported is Postgres, but the architecture is open
to embrace more servers in a future. One of his strongest (IMHO ;-)) points is
that it can be tried or used without changing a line of the existing code,
because the balancing is done at Postgres protocol level.
DBBalancer can do different things.
* It's a connection pool... * ... a load balancer, * .. and a database replicator.
And can be used any combination of these things at the same time.
I just compiled it but didn't run yet. I think if this project has a
good architectural design and idea it would be nice to have it
works as a postgresql companion project. Why do we need yet another
replication hack instead of join efforts.
Oleg
On Fri, 8 Jun 2001, Mark Pritchard wrote:
> Hi all,
>
> I've been using PostgreSQL for a couple of high performance projects
> recently and have been extremely impressed - much kudos to all involved in
> bringing it this far. One thing that is limiting is the lack of fault
> tolerance and load balancing.
>
> Anyway, I've recently started lurking on the hackers mailing list and I'm
> quite captivated by the addition of replication to PostgreSQL and note that
> it is an urgent action item on the to-do list.
>
> There is a lot of information out there on algorithms and approaches, and
> I'm wondering who is leading this effort and how I can help. I've got quite
> a few ideas on how to attack the problem, such as:
>
> * defining the type of replication we are after (hot swap / consistent,
> read-only clones, delayed etc). I'd be after the first - a hot swap cluster
> with load balancing so a read (SELECT) can be serviced by any machine and an
> modification (DELETE/UPDATE/INSERT) is propagated through the cluster
> immediately. This would make PostgreSQL a viable alternative to that other
> Enterprise level offering *cough* Oracle *cough*
>
> * establishing the propagation process when initialising the replication
>
> * implementing the propagation algorithm for modification queries
>
> I'm currently employed as a C/C++/Java programmer, so I'm comfortable with
> understanding and writing solid and clean C/C++ code.
>
> I'm happy to whip up a document outlining my ideas...or post them to the
> mailing list, or whatever really. Just want to help :)
>
> Cheers,
>
> Mark
>
>
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Regards, Oleg
_____________________________________________________________
Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
Sternberg Astronomical Institute, Moscow University (Russia)
Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(095)939-16-83, +007(095)939-23-83
