[Opensim-dev] On Mantis #1370 (avatar persistence)

[Teravus Ovares]

Just a FYI,

UUIDS will not be duplicated across grids, we've stated in many forums that
the chances of a UUID duplication even across hundreds of grids generating
UUIDs at the same time is like winning the lottery 50 times in a row, it
just doesn't happen.

Best Regards

Teravus


On 6/11/08, f.d.g. <opensim-ml at fdg.org> wrote:
>
> If I'm allowed to throw in my 2 cents...
>
> Sean Dague wrote:
> > On Tue, Jun 10, 2008 at 01:39:41AM +0900, liu xiaolu wrote:
> >> I think it is not necessary (or should not) to check assetID's
> avaliability
> >> by using C# code.
> >> It is a tired, buggy way to go, even you can make "getinventory"
> >> synchronous.
> >> Both of the MySQL, MSSQL have the native support of "FOREGIN KEY
> >> constaints".
> >> RDBMS should handle such task for us.
> >
> > SQLite doesn't handle it natively, and we've not really used foreign
> > keys anywhere else in the design up till this point.
>
> If SQLite doesn't handle it (natively), then please don't use it,
> because: OpenSim right now is (nearly) perfect for SL skin/(basic)
> clothes designers. They can use the official viewer for previewing,
> without having to use some 'strange' programs or relying on the beta
> grid or paying for every upload to SL. The ease of use of OpenSim is
> given by the simple setup - just hit enter several times. These
> designers surely don't want to mess around with setting up MySQL or
> MSSQL or any other database.
>
>
> The second reason for not relying on the RDBMS "FOREIGN KEY", in my
> opinion, is the question: Would it work with Capabilities?
>
>
> In the context of capabilities I hope I'm also allowed to explain my
> hope on to what OpenSim will develop in the future - and I think the
> "FOREIGN KEY" perhaps won't work in that situation:
>
> Right now UUIDs are used as a key to everything. As far as I can see
> these UUIDs are unique only on one single grid - on another grid the
> same UUID could point to something completely different. Thus,
> connecting two grids won't work. As far as I can see the realXtend
> people do the travelling from one grid to another 'simply' by loging out
> the current user and loging in a new user on the grid you travel to,
> thus needing to create accounts on all grids you want to travel to.
>
> Now, how about 'simply' prepending a fully qualified domain name to the
> UUIDs? Then the grid you just travelled to could get all the needed
> data, like avatar appearance, by contacting the 'home' grid of that
> avatar and caching this needed data as long as the avatar is on that
> grid - and which grid is the 'home' grid of that avatar it knows from
> the FQDN prepented to the UUID of that avatar. By the way, I think it
> then would be needed to prepend a FQDN to every UUID to prevent
> duplicate UUIDs, like UUIDs for skins, clothes, attachments and so on.
>
> As far as I can see, this "prepending a FQDN to a UUID" is what
> capabilities look like, so with the proper use of capabilties throughout
> the whole system the implementation of 'grid-hopping' would be rather easy.
>
>
>
> Bye
> f.d.g.
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