[ogsa-d-wg] New version of architecture document

[Dave Berry]

It occurs to me that some of the issues covered by the WS-DAI properties
are perhaps worthy of more general discussion in the architecture:

1. Derived data resources.  WS-DAI has properties that show whether
updates to a child are reflected in the parent and vice-versa.  I think
we mention derived data in passing; we could say more about it and treat
it more consistently.

2. Concurrent access and local transaction support.  ByteIO deliberately
says nothing about concurrent access; we should at least mention this.
Possible we should consider these issues across all data services?  The
discussion of distributed transactions in 3.9 should mention the WS-DAI
support for local transactions.

3. The WS-DAI CoreResource interface handles mapping from abstract names
to addresses. We need to understand how this relates to the OGSA naming
scheme.

4. WS-DAI defines properties for the name of a resource and a
human-readable description of the resource.  These seem reasonably
generic properties - we (or even the OGSA WG) might want to consider
whether they are more widely useful.  (Or perhaps we should ask the DAIS
WG to explain why they are necessary in WS-DAI if they are not needed
anywhere else).

Finally, I note that section 11.3 mentions enhanced access operations
that would ease the federation of a data resource.  This is worth a
forward mention from the data access section itself.

Dave.


-----Original Message-----
From: owner-ogsa-d-wg at ggf.org [mailto:owner-ogsa-d-wg at ggf.org] On Behalf
Of Dave Berry
Sent: 29 June 2006 23:34
To: ogsa-d-wg at gridforum.org
Subject: [ogsa-d-wg] New version of architecture document


I've uploaded a new version of the architecture document -
https://forge.gridforum.org/sf/docman/do/downloadDocument/projects.ogsa-
d-wg/docman.root.working_drafts/doc13621/2.

Changes:

- I've moved some generic description out of the data access section
into the introductory sections.
- I've tidied the data access section.  At least, I think it's tidier;
please could the authors take a look and tell me what I've messed up?
- I've made the discussion of policies and agreements more consistent
throughout the document.  This includes moving a list of example
policies from the federation section into section 2.
- I've tidied the glossary, removing unused items and ensuring that
certain other terms are used consistently in the text.

Note: where I've copied chunks of text from one place to another, I
switched off change tracking because such large deletions and additions
don't tell you much.  Instead, I've highlighted the text in yellow where
it now appears.

Still to do (at least):
- Add a discussion of interfaces to the data caching section.
- Ditto for the replication section.
- Revise the metadata catalog section.
- Tidy the appendix list of standards.

I'm about to go on holiday for a week, so these tasks won't get done for
a while.

Dave Berry
Deputy Director, Research & E-infrastructure Development National
e-Science Centre, 15 South College Street
Edinburgh, EH8 9AA           Tel: +44 131 651 4039