[ogsa-naming-wg] RE: GGF/OGSA standards for hierarchical namespaces

[Christopher Jordan]

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(cc list trimmed again to reduce duplicates, probably still somewhat  
unsuccessfully)

I think it's clear that the existing notifications etc system in WSRF  
and friends would allow us to obtain properties about the EPRs  
referred to by directory entries, including directory entries  
themselves. But my feeling is that, especially in cases where there  
are potentially thousands of entries in a directory, having the  
necessary properties, and *only* the necessary properties, cached at  
the directory service (with lifetimes and such, of course). In  
addition, I see the directory service (and I think I'm not alone in  
this) as a building block for more interesting services like grid  
filesystems, in which the set of properties you might want associated  
with each entry in a directory is not necessarily coincident, and may  
well be a superset, of the properties associated with the EPRs  
referenced by the entries in a directory.

Clearly, the properties associated with directory entries will in the  
majority of cases be acquired and updated using operations in the  
WSRF family (or whatever analogous mechanism is provided in non-WS  
renderings of OGSA and friends), but I want to be very clear about  
not using the fact that you can query EPRs for their properties in  
lieu of associating properties with directory entries directly within  
the service.

Does that make sense?

On Apr 6, 2006, at 3:21 AM, David Snelling wrote:

> Dave,
>
> On 5 Apr 2006, at 20:53, Dave Berry wrote:
>
>> Another question I've had raised to me is whether we can use WSRF/ 
>> WSRT
>> to handle the properties associated with entries in the directory.  I
>> personally don't see how this would work, but given the context we're
>> working in it would be helpful to establish what relationship  
>> exists, if
>> any.
>
> If the "Directory" were referred to by an EPR, then with the WSRF/ 
> WS-Transfer operations one could obtain properties using the Get*  
> operations. These properties could be both standardized across all  
> domains (e.g. number of entries) or be domain specific (e.g. rwx  
> flag settings) or be dynamic to a specific instance (e.g. "The  
> 'files' in tis directory are all pipes connected to experiments.").
>
>
>>
>> Best wishes,
>>
>> Dave.

- ----------------------------------------------------
Chris Jordan
HPC Systems Engineer
High End Computing Systems Group
San Diego Supercomputer Center
ctjordan at sdsc.edu
858.534.8347

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