[ogsa-wg] [glue-wg] New draft of GLUE 2.0 Specification

[Sergio Andreozzi]

Hi Gerson,

Gerson Galang wrote:
> Thanks for integrating our requirements into the new GLUE 2.0 spec. What 
> you have in the draft will work for us now.
> 
> The only thing I want to comment on is the ComputingShare's relationship 
> with the ComputingResource and ComputingService entities. If a 
> ComputingShare is an abstraction of a queue 

this is not always the case. That's why we have a different 
naming/definition. For instance, in the LSF batch system you can use 
hierarchical fair sharing in order to define different utilization 
targets for jobs entering the same queue. The scheduling will consider 
the group to which the job was mapped.


Therefore you can have, for instance, one queue with three different 
utilization targets for group A, B and C or three queues for each of 
them. At the GLUE level, they will appear the same, via the share concept.

> and the ComputingElement is 
> an abstraction of the Batch System, 

in the new version, the batch system is associated to the computing 
resource. I realize that we have to clean up the properties list (moving 
the batch system specific from computing element to computing resource).

> then there should be a direct >
> association between the ComputingShare and the ComputingElement. Having 
> the ComputingShare linked to the ComputingService will introduce a 
> number of replicated instances of the same ComputingShare on all the 
> ComputingServices which is not really necessary. Attached is the diagram 
> again to refresh your memory on what I think it should look like. 
> Anyway, just my 2 cents..

I think the relationship between a share and the service is needed 
because you can expose a certain share via a certain service, while 
another share with another service. You should be able to know which 
share for which resource is accessible via a certain service interface.

We will add detailed information in the doc revision.

Cheers, Sergio

> 
> Cheers,
> Gerson
> 
> 
> On 6/27/07, *Sergio Andreozzi* < sergio.andreozzi at cnaf.infn.it 
> <mailto:sergio.andreozzi at cnaf.infn.it>> wrote:
> 
>     Hi everybody,
> 
>     we have just uploaded a new draft of the GLUE 2.0 specification.
> 
>     Here are the main changes:
> 
>     - clarify difference between computing resource and computing element
>     - from Gerson Galang use case: single computing service in front of two
>     different batch systems
>     - general clean-up
>     - inclusion of first UML Class diagram for Storage Element (description
>     to be added)
>     - added activity entity
>     - promoted share entity as a main concept
> 
>     you can find it in the draft section of GLUE WG document repository:
>     http://forge.ogf.org/sf/docman/do/listDocuments/projects.glue-wg/docman.root.drafts
>     <http://forge.ogf.org/sf/docman/do/listDocuments/projects.glue-wg/docman.root.drafts>
> 
>     we plan to provide a preview of the new changes in the tomorrow call of
>     the OGSA Resource Management Design Team phonecall:
>     http://www.google.com/calendar/event?eid=N25vaWg5MjQ4NTRzOWJpdTU0c3VwMWZzcmMgb2dzYS53Z0Bt&ctz=America/Chicago
>     <http://www.google.com/calendar/event?eid=N25vaWg5MjQ4NTRzOWJpdTU0c3VwMWZzcmMgb2dzYS53Z0Bt&ctz=America/Chicago>
> 
>     (we apologize for the short-term advise)
> 
> 
>     We will set up a phonecall next week for the GLUE WG. Comments/questions
>     are always welcome.
> 
>     Best regards,
> 
>     Sergio and Balazs
> 
>     --
>     Sergio Andreozzi
>     INFN-CNAF,                    Tel: +39 051 609 2860
>     Viale Berti Pichat, 6/2       Fax: +39 051 609 2746
>     40126 Bologna (Italy)         Web:
>     http://www.cnaf.infn.it/~andreozzi
>     <http://www.cnaf.infn.it/%7Eandreozzi>
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> 
> 
> 
> ------------------------------------------------------------------------
> 


-- 
Sergio Andreozzi
INFN-CNAF,                    Tel: +39 051 609 2860
Viale Berti Pichat, 6/2       Fax: +39 051 609 2746
40126 Bologna (Italy)         Web: http://www.cnaf.infn.it/~andreozzi