[ogsa-wg] [glue-wg] OGSA Information Services

Gerson Galang gerson.sapac at gmail.com
Sun Aug 19 21:11:07 CDT 2007 

Thanks Laurence,

On 8/17/07, Laurence Field <Laurence.Field at cern.ch> wrote:
>
> Hi Gerson,
>
> A common information system client would bets fit will with the SAGA
> work. They are already working on an API for Service discovery which
> will use plugins to find information from the different grids.


I'll try and get in contact with the people from SAGA who might find a use
for the stuff we've been working on.

The OGSA Information Services group is currently looking it existing
> technologies used in information systems. Your experiences with MDS4 and
> XPath would be valuable input to this group.  Do you have anything
> available which documents your experiences?


We have most of our documentations on deploying the Australian National
Grid's Info System available on this twiki page...

http://www.vpac.org/twiki/bin/view/APACgrid/PlanResource

If you want something in a technical report/paper format...

http://www.vpac.org/twiki/bin/view/APACgrid/PlanResource#Technical_Reports_Papers

Regards,
Gerson


Thanks
>
> Laurence
>
>
> Gerson Galang wrote:
> > Hi all,
> >
> > I don't have anything against having another layer sitting on top of
> > all different Grid information systems implementation but I'm just not
> > sure if that model will scale.
> >
> > I got interested in this discussion because I'm developing an
> > application which is somewhat related to what I'm going to recommend
> > below. The application is being developed for the Australian Grid
> > users and developers and is going to be used in querying an MDS4 index
> > service which uses the GLUE 1.2 schema. We have specified our own
> > query language for querying the information system because we didn't
> > want developers to write XPath queries if they directly interact with
> > MDS4. As you know a very simple resource condition in an info systems
> > query can turn out to be a very long query string when converted into
> > XPath especially XPath 1.1 which is what MDS4 only understands.
> >
> > This group should probably look into implementing a similar generic
> > Grid info systems client application for all the Grid info systems
> > implementations around the world. Since the plan is to use the GLUE
> > schema, there won't be any issues with specifying a standard query
> > language that users can use with this client. The client will need to
> > be able to query a "registry of endpoints" service to get information
> > about the endpoint, query implementation (eg. wsrf/mds4, mds2, etc),
> > and the query language (xpath, xquery, ldap, sql) to use for the info
> > systems. The client will be the one in charge of transforming the
> > user's query into the respective query languages used by the different
> > Grid information systems implementations. I think we'll get a quicker
> > response if we query the "registry of endpoints" service than the top
> > level information system which indexes all the Grid resource
> > information around the world.
> >
> > Our application can only handle a very simple query at the moment. See
> > link below..
> >
> >
> https://www.grid.apac.edu.au/repository/svn/infosystems/GlueSchemaQueryLib/README
> > <
> https://www.grid.apac.edu.au/repository/svn/infosystems/GlueSchemaQueryLib/README
> >
> >
> > but we have plans of extending the language later on to support
> > queries like "(Site.Latitude > 0 and Site.Latitude < 50)". Composing a
> > query for the GLUE schema shouldn't be that hard. The only thing which
> > makes the query complicated is the language we use in querying the
> > Grid info systems.
> >
> > I'm just not sure if what we are implementing is something you would
> > want to look into.
> >
> > Regards,
> > Gerson
> >
> > On 8/4/07, *Andreas Savva* <andreas.savva at jp.fujitsu.com
> > <mailto:andreas.savva at jp.fujitsu.com>> wrote:
> >
> >     The presentation Ravi is referring to is
> >     https://forge.gridforum.org/sf/go/doc14456?nav=1
> >     <https://forge.gridforum.org/sf/go/doc14456?nav=1>
> >
> >     Subramaniam, Ravi wrote:
> >     > Hi Hiro/Felix,
> >     >
> >     > Currently the examples in the document are from "academia" (not
> >     that I
> >     > am against that as most who know me will attest) but in the
> >     spirit of
> >     > including enterprise examples would it make sense to include the
> >     > implementation that I presented at the OGSA F2F in Manchester as
> an
> >     > example for the enterprise case?
> >     >
> >     > Ravi
> >     >
> >     > -----Original Message-----
> >     > From: ogsa-wg-bounces at ogf.org <mailto:ogsa-wg-bounces at ogf.org>
> >     [mailto:ogsa-wg-bounces at ogf.org <mailto:ogsa-wg-bounces at ogf.org>]
> >     On Behalf
> >     > Of Hiro Kishimoto
> >     > Sent: Wednesday, August 01, 2007 2:49 PM
> >     > To: ogsa-wg
> >     > Cc: glue-wg at ogf.org <mailto:glue-wg at ogf.org>
> >     > Subject: Re: [ogsa-wg] OGSA Information Services
> >     >
> >     > Hi all,
> >     >
> >     > Per Felix's request, I've upload revised draft onto the GridForge.
> >     >
> >     > https://forge.gridforum.org/sf/go/doc14692
> >     >
> >     > We will discuss it at Thursday's call.
> >     >
> >     > Thanks,
> >     > ----
> >     > Hiro Kishimoto
> >     >
> >     > -------- Original Message  --------
> >     > Subject: Re:[ogsa-wg] OGSA Information Services
> >     > From: Hiro Kishimoto < hiro.kishimoto at jp.fujitsu.com
> >     <mailto:hiro.kishimoto at jp.fujitsu.com> >
> >     > To: ogsa-wg <ogsa-wg at ogf.org <mailto:ogsa-wg at ogf.org>>
> >     > Cc: felix.ehm at cern.ch <mailto:felix.ehm at cern.ch>
> >     > Date: 2007/07/26 12:55
> >     >
> >     >> Hi all,
> >     >>
> >     >> Discussion material for Information Services by Laurence Field
> and
> >     >> Felix Ehm is now on the GridForge.
> >     >>
> >     >> https://forge.gridforum.org/sf/go/doc14692
> >     <https://forge.gridforum.org/sf/go/doc14692>
> >     >>
> >     >>  > This document covers the problem description, experience in
> >     GIN,  >
> >     >
> >     >> overview of existing systems, generalized system and suggested  >
> >     >> areas for standardization.
> >     >>
> >     >> Please have a look before the call today.
> >     >>
> >     >> Felix Ehm will lead the discussion.
> >     >>
> >     >> Thanks,
> >     >> ----
> >     >> Hiro Kishimoto
> >     >>
> >     >>
> >     >> --
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> >     >>
> >     >>
> >     >
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