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Notes from OGF 28
by Laurence Field 23 Mar '10

23 Mar '10

The main aim for the GLUE session at OGF 28 was to provide a status update on the GLUE 2.0 renderings. The first part of the session was comprised of a number of presentations giving the status of the LDAP and XML renderings. The second part was a free-from discussion on the status and the next steps. It was noticed that we could have spent more time discussing various topics, so for the next OGF we may want to consider two sessions rather than just one. A nice surprise was to find out that D-Grid have implemented a portal using the GLUE 2.0 data model. It was suggested that we should maintain a collection of projects using the GLUE 2.0 model. As concrete outcomes, it was decided that we need to push forward with rendering documents with the aim of finalizing them soon. The LDAP rendering document is in good shape and should not take to much effort to finish. For the XML renderings, Balazs will arrange some phone meetings in order to discuss the outstanding issues. The question of whether or not we need an SQL rendering was raised. Although many people are putting GLUE 2.0 information into relational databases, is there a need to standardize the model? Slides from the session can be found at the following location. http://forge.gridforum.org/sf/docman/do/listDocuments/projects.glue-wg/docm… Laurence

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OGF28 Session
by Laurence Field 12 Mar '10

12 Mar '10

So far we have five presentations. 1) Short Glue 2.0 Overview - Laurence 2) LDAP rendering - Laurence 3) XML rendering status and plans - Balazs 4) TeraGrid's GLUE 2 -JP 5) Planning for GLUE 2 errata - Balazs Is there anything else we need to add? We can upload the presentations of the day. Laurence

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Planning for OGF 28
by Laurence Field 11 Mar '10

11 Mar '10

The GLUE WG has a 90 minute session starting at 15:30 on Thursday 18th March. In order to prepare for this session we will need to know who will from this group will be attending and what presentations will be given. I will be attending and propose to give three short presentations. 1) A quick overview of Glue 2.0 2) The LDAP rendering 3) The status and plans for roll out within EGEE/WLCG If anyone would like to give an additional presentation, can suggest a presentation that we should include or would like to propose a discussion topic, please let me know. Thanks, Laurence

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Re: [glue-wg] Another erratum?
by stephen.burke＠stfc.ac.uk 26 Feb '10

26 Feb '10

David Horat [mailto:david.horat@gmail.com] said: > What do you want to do? I'm not sure, but in writing an info provider I have to code something ... the options are to print nothing, to print a Key but not a Value, or to print a Key with Value=UNDEFINEDVALUE. At the moment I can't do the second one because the schema doesn't allow it, so I'm currently doing the third one. > Having a key without value should be the same as not having the key. Not entirely, for example if you search for objects with an Extension with a given Key regardless of the Value you'd get a different answer. Whether there's a practical application is another matter ... Stephen -- Scanned by iCritical.

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Another erratum?
by stephen.burke＠stfc.ac.uk 25 Feb '10

25 Feb '10

Hi, I see that ExtensionValue is mandatory - was that what we intended? It doesn't match what we have for ServiceData in 1.3: MUST GlueServiceDataKey MAY (GlueServiceDataValue $ GlueChunkKey) ) For now I'll put out UNDEFINEDVALUE if necessary ... Stephen -- Scanned by iCritical.

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1.3 erratum
by stephen.burke＠stfc.ac.uk 18 Feb '10

18 Feb '10

Hi, I just noticed a typo in the 1.3 schema document (page 10): "Policy.MaxSlotsPerJobs int32 1 The maximum number of slots which could be allocated to a single job (defined to be 1 for a site accepting only standard jobs). (NN)" That should be MaxSlotsPerJob (singular) - it's correct in the LDAP schema. Stephen -- Scanned by iCritical.

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(Extended) Call for Chapters - Computational & Data Grids: Principles, Designs, and Applications
by Nikolaos Preve 06 Dec '09

06 Dec '09

--------------------------------------------------------------------------- Please accept our apologies if you receive multiple copies of this Call for Chapters --------------------------------------------------------------------------- Dear Colleagues, We would like to introduce you to a forthcoming edited book which focuses on the "Computational and Data Grids: Principles, Designs, and Applications" and to invite you to submit a chapter proposal or a paper before December 30. Please feel free to forward this message to your colleagues if any of them would be interested in this edited book. Let us know if you have any questions regarding this matter. Thanks for your consideration. Nikolaos --------------------------------------------------------------------------- CALL FOR CHAPTERS Proposal Submission Deadline: -Extended- December 30, 2009 Computational and Data Grids: Principles, Designs, and Applications A book edited by Nikolaos Preve (PhD) National Technical University of Athens, Greece To be published by IGI Global: http://www.igi-global.com/requests/details.asp?ID=748 Introduction Grid computing is the next generation information technology infrastructure that promises to transform the way organizations and individuals compute, communicate and collaborate. Grid computing is an evolution of distributed computing and it refers to a large-scale high-performance computing which combines distributed heterogeneous computing resources and the result is a unique large virtual supercomputer with a vast amount of shared processing power and data storage. Considering the enormous amount of these underutilized computing resources, the necessity of a grid infrastructure is compulsory. A computational grid provides access to users who want to utilize the shared processing resources in order to efficiently apply high throughput applications on distributed machines. The second most common shared resource used in a grid is data storage and it is known as data grid. This type of grid provides distributed storage capacity such as attached memory to the processor, hard disk drives or other types of permanent storage. Grid computing can assist grid users in order to utilize to the maximum computing resources by applying tasks and solving a scientific or technical problem that requires a great number of computer processing cycles or the need to process large amounts of data. Objective of the Book This book aims to provide relevant theoretical frameworks and will cover the latest empirical research findings in the area of grid computing. The goal of this book is to represent theoretical frameworks, methodologies, implementations, and cutting edge research findings with a critical perspective bridging the gap between academia and the latest achievements of the computer industry. It will be written for professionals, as well as students, who are involved or interested in the study, use, design, and development of grid computing and want to improve and empower their understanding of it. Also, this book aims to help researchers and developers understand the basics of the field, to highlight the various developments over the years in the field by giving an in depth analysis of grid networks. Target Audience The target audience of this book will be composed of professionals, engineers, researchers and students who are interested and working in the field of grid computing. Moreover, the book will provide insights and can serve as both literature at an undergraduate level and as an overview of the area. Recommended topics include, but are not limited to, the following: 1.Theories, definitions, methodologies, models, applications, simulations, and architectures relevant to grid computing 2.Implementations of computational grids, data grids, sensor and mobile grids 3.Grid data storage, grid databases, data management, and data mining 4.Indexing and query optimization over grid databases 5.Grid middleware 6.Web services 7.Security, cryptography, and cryptanalysis 8.Artificial intelligence 9.Algorithms 10.Scheduling, resource management, and optimization 11.Workflow and fault tolerance 12.Programming in grid computing 13.Cloud computing and grids 14.Grid computing in scientific problems (i.e. astrophysics, chemistry, economy and finance, electromagnetics, geophysics, meteorology, numerical analysis, statistics) Submission Procedure Researchers and practitioners are invited to submit on or before December 30, 2009, a 1-2 page chapter clearly explaining the mission and concerns of the proposed chapter. We also highly encourage early full chapter submissions. Please include the title of the book in the subject line of your e-mail. Authors will be notified by January 15, 2010 about the status of their proposals and will be sent chapter guidelines. Full chapters are expected to be submitted by March 31, 2010 or earlier. All submitted chapters must not have been published elsewhere and will undergo a double-blind peer review by at least two referees. Contributors may also be requested to serve as reviewers for this project. Publisher This book is scheduled to be published by IGI Global (formerly Idea Group Inc.), publisher of the “Information Science Reference” (formerly Idea Group Reference), “Medical Information Science Reference,” “Business Science Reference,” and “Engineering Science Reference” imprints. For additional information regarding the publisher, please visit www.igi-global.com. This publication is anticipated to be released in 2010. Important Dates December 30, 2009: Proposal Submission Deadline January 15, 2010: Notification of Acceptance March 31, 2010: Full Chapter Submission June 15, 2010: Review Results Returned August 15, 2010: Final Chapter Submission September 15, 2010: Final Deadline Inquiries and submissions can be forwarded electronically (Word document) or by mail to: Nikolaos Preve (PhD) School of Electrical and Computer Engineering National Technical University of Athens, 15773 Zographou, Greece Tel.: +30 211 770 8053 - GSM: +30 697 750 4197 E-mail: nikpreb(a)mail.ntua.gr with cc to: Editorial Board E-mail: editorialt(a)gmail.com

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GLUE 2.0 in LDAP document
by David Horat 25 Nov '09

25 Nov '09

Dear colleagues, Finally I have put together all major design decisions made during the LDAP implementation process and created a document with them. It is now open to your comments and suggestions. http://forge.gridforum.org/sf/go/doc15518 Regards, David -- David Horat Software Engineer – IT/GD – Grid Deployment Group CERN – European Organization for Nuclear Research » Where the web was born Address: 1211 Geneva - Switzerland, Office: 28/R-003 Phone +41 22 76 77996 Fax +41 22 76 68178 (fax to email service) Web: http://cern.ch/horat Web: http://davidhorat.com/ Profile: http://linkedin.com/in/davidhorat

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Usage of GLUE2 XML realization
by Weijian Fang 13 Nov '09

13 Nov '09

Hi, We are looking at GLUE2 XML realizations, i.e., the official but a little obsolete one (http://schemas.ogf.org/glue/2008/05/spec_2.0_d42_r01) and the NorduGrid one (http://svn.nordugrid.org/trac/nordugrid/browser/arc1/trunk/doc/tech_doc/inf…. (We are also aware of the TeraGrid GLUE2 XML schema.) The official schema and the NorduGrid schema are similar. Both define only a single XML element: <Domains>. And all the other entities are defined as XML types instead of elements. Thus they can be included in <Domains> but can never stand on their own. Therefore, under this design, in order to update a single piece of information, for instance, Domains/AdminDomain/Services/ComputingService/RunningJobs, one has to re-publish the whole AdminDomain. Our observation is that the current design of GLUE2 XML schema is not optimised for updating part of the information. Is this because updating part of the information is never an intended usage pattern of GLUE? A validity attribute is defined for each entity. We assume the intended usage pattern of GLUE information model (including the XML realization) is to PERIODICALLY publish ALL the information once the validity period expires. Are we correct? Many thanks! -- Dr. Weijian Fang OMII-UK 4067 Building 32 School of Electronics and Computer Science University of Southampton Southampton SO17 1BJ United Kingdom

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Strings
by stephen.burke＠stfc.ac.uk 26 Oct '09

26 Oct '09

Hi, A point just came up about the representation of strings. In the GLUE 2 specification it seems we have no definition of the "string" type, which looks like an oversight (other than an implication in the placeholder section that strings may be UTF-8). In the GLUE 2 LDAP schema as currently implemented for EGEE, strings seem to be typed as IA5String as they were in glue 1, which is basically 7-bit ascii so special characters are not allowed. Should we be allowing UTF-8 strings? Stephen -- Scanned by iCritical.

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