[glue-wg] Foreign Key implementation on GLUE 2.0 LDAPimplementation

[David Horat]

Ahhh, I didn't though about other renderings and that this information may
be in other technologies. I understand now tha the unique ID will be the
only key that will be common in all implementations. :)

Thanks Stephen.

Any other comments on the rest of the Foreign Key implementation?

On Thu, Mar 26, 2009 at 10:57 AM, Burke, S (Stephen) <
stephen.burke at stfc.ac.uk> wrote:

> David Horat [mailto:david.horat at cern.ch] said:
> > What is the difference between having a DN or an ID in objects?
> > Are objects going to be moved around so their DN will change but you
> want to preserve that relationship?
>
> Glue is a generic schema with multiple renderings. A DN won't mean much
> if you try to connect it to an xml rendering, but an ID will. Also
> indeed I think it's quite possible that we may want to restructure the
> tree, especially at higher levels - we already do that for glue 1,
> objects have different DNs if you read them in different places.
>
>  Also from a practical point of view there seems to be no real
> performance hit from querying objects by ID, and I think most/all
> clients do it that way at the moment.
>
> > When implementing relationships you need to know exactly where to
> look. Although our IDs are specified as "A global Unique ID", LDAP has
> no way to assure this as it uses the DN as its key.
>
> That's irrelevant, the uniqueness has to be established by the info
> providers.
>
> > Moreover, when searching, as you said, it uses the DN,
>
> It depends how you do the query - in practice we normally just query
> against the root DN and do everything else with objectclasses or
> attributes in the query filter. So in the simplest case you'd just query
> for (EntityID=xxx) and you'd get that object.
>
> Stephen
>
> --
> Scanned by iCritical.
>



-- 
David Horat
Software Engineer specialized in Grid and Web technologies
IT Department – Grid Deployment Group
CERN – European Organization for Nuclear Research » Where the web was born
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