Emmanuel:
I have doing some reading on the Sequoia mailing list
and it looks like total order for JGroups is very slow
and people recommend using Appia instead.
Should I plan to use Appia instead?
Are the docs on how to set it up?
Thanks
Neil
--
Neil Aggarwal, (214)986-3533, www.JAMMConsulting.com
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> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf
> Of Emmanuel Cecchet
> Sent: Tuesday, October 24, 2006 7:03 AM
> To: Sequoia general mailing list
> Subject: Re: [Sequoia] Network layout for two geographically
> separate machines
>
> Hi Neil,
> > I have read the Sequoia installation guide and
> > the JGroups users guide and have come up with a layout
> > to use for two geographically separate machines that
> > are interconnected via SSL tunnelled connections.
> >
> Be careful that you need to use a JGroups that provides total
> order like
> the one defined in config/sequencer.xml. The config you provided does
> not seem to implement total order.
> > For the database backends, each controller will use
> > these two URLs for each of their backends:
> > jdbc:mysql://localhost:3306
> > jdbc:mysql://localhost:3406
> > That way, each will have access to both databases.
> >
> > Do the controllers need access to both of the databases
> > or does each use only its local copy?
> >
> No you cannot share a backend between multiple controllers.
> At any given
> time, a backend can only be attached to a single controller.
> You might
> want remote backend access in case you would like to transfer
> a backend
> from one controller to another. However, the same url is
> supposed to be
> used on every controller to access a backend (that would not work in
> your case because the url is different is you access the
> backend locally
> or remotely).
> So I would recommend so skip the remote MySQL access and just
> stick with
> local controller access.
> > Does this configuration look correct or did I miss
> > something?
> >
> If you ensure that you use total order for the group
> communication and
> you don't share your backends, the config looks ok. Be aware that
> Sequoia does not support network partitions (if your ssh
> tunnels go down
> but both controllers are still working, your 2 sub-clusters
> will diverge
> and cannot reconcile automatically).
>
> Thanks for your interest in Sequoia,
> Emmanuel
>
> --
> Emmanuel Cecchet
> Chief Architect, Continuent
>
> Blog: http://emanux.blogspot.com/
> Open source: http://www.continuent.org
> Corporate: http://www.continuent.com
> Skype: emmanuel_cecchet
> Cell: +33 687 342 685
>
>
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