Re: Bidirectional replication

Thanks you all,
I started with Bucardo. I installed activeperl 5.12 on my Linux(RHEL5.5)
server.
Can you please suggest some link which describe the installation steps in
details.

Thanks,
Tushar

On Tue, May 3, 2011 at 2:49 PM, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:

> On Tue, May 3, 2011 at 7:31 AM, Sim Zacks <sim(at)compulab(dot)co(dot)il> wrote:
>
> > I have heard good things about Bucardo, though I haven't tried it myself
> > yet. I was warned that it would be risky to have 2 masters that have the
> > same tables modified in both because of issues such as delayed sync, race
> > conditions and other such goodies that may corrupt the meaning of the
> data.
>
>
> Just to be clear and fair to Bucardo, I would add a few points.
>
> All multi-master replication solutions that use an optimistic
> mechanism require "conflict resolution" cases and code. This is the
> same with SQLServer and Oracle etc.. Referring to a well known problem
> as a race condition seems to introduce doubt and fear into a situation
> that is well understood. Bucardo does offer hooks for conflict
> resolution to allow you to program around the issues.
>
> So if I felt that multi-master replication was the right way to go for
> a solution, Bucardo is a good choice.
>
> Just to add other info: if multi-master replication uses pessimistic
> coherence, then the coherence mechanism can also be a source of
> contention and/or cause the need for alternative kinds of conflict
> resolution.
>
> --
> Simon Riggs http://www.2ndQuadrant.com/
> PostgreSQL Development, 24x7 Support, Training & Services
>
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