[rm-wg] Fwd: rm-wg post from donal.k.fellows at manchester.ac.uk requires approval
David Snelling
David.Snelling at UK.Fujitsu.com
Fri Apr 13 03:54:38 CDT 2007
Cross post.
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> From: rm-wg-owner at ogf.org
> Date: 13 April 2007 09:38:08 BDT
> To: rm-wg-owner at ogf.org
> Subject: rm-wg post from donal.k.fellows at manchester.ac.uk requires
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> From: donal.k.fellows at manchester.ac.uk
> Subject: Re: [ogsa-wg] Glossary terms for Thursday's call
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> From: "Donal K. Fellows" <donal.k.fellows at manchester.ac.uk>
> Date: 13 April 2007 09:37:43 BDT
> To: "Strong, Paul" <pstrong at ebay.com>
> Cc: ogsa-wg <ogsa-wg at ogf.org>, rm-wg at ogf.org
> Subject: Re: [ogsa-wg] Glossary terms for Thursday's call
>
>
> Strong, Paul wrote:
>> Within the RM-WG we have split attributes into configuration
>> attributes and state attributes. Configuration attributes to some
>> degree define behavior, defining or constraining the set of
>> allowed states, as well as the possible values of state attributes
>> and allowed transitions between states. Clearly configuration
>> attributes are “interesting”, and thus according to the definition
>> below they would be considered part of the state. I’m not sure
>> that this is the case.
>
> An argument that I made during the call (and which it might have been
> nice to have delved into in more detail if we'd had a few days instead
> of 15 minutes!) is that an altered configuration creates a different
> resource/stateful entity[*], but an altered state is something that is
> expected during the normal working lifetime of a resource and does not
> change the fundamental nature of that resource. That is, a change of
> config is qualitatively different to a change of state, even if
> both are
> (represented as) attributes.
>
> In general, there are loads of definitions of state (I've got a
> background which leads me to regard it as really a partial function
> whose domain is the cartesian product of time and names for "stateful"
> things) but they're just different ways of looking at the same thing.
> The good aspects of the current definition are that it is
> observable and
> changes in it are events, things which are not implicit in the
> standard
> CS definitions of the term and yet are very useful for grids.
>
> Donal.
> [* As you can tell, I've lost track of what kind of thing contains
> such
> attributes. I know *I* think of them as resources, but that doesn't
> make me right. :-) ]
>
>
>
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--
Take care:
Dr. David Snelling < David . Snelling . UK . Fujitsu . com >
Fujitsu Laboratories of Europe Limited
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