[Pgi-wg] Documents for discusion in Oxford next week

[Andrew Grimshaw]

Colleagues,

After a long gestation period the documents first discussed in Lyon several
years ago are ready for discussion. To my GLUE colleagues you are receiving
this email because the first document includes the incorporation of GLUE2
into JSDL and BES factory attributes. The documents can be found in the
OGSA-BES document area: http://redmine.ogf.org/dmsf/ogsa-bes-wg

 

Andrew

 

Document 1: BES/JSDL 1.1 Extensions

The Production Grid Interoperability Working Group identified a number of
execution management use cases and requirements in GFD.180. A number of ways
to meet these requirements have been extensively discussed. They fall into
two categories: 1) define a new set of specifications from scratch to meet
the requirements, and 2), profile and minimally extend existing
specifications to meet the requirements. 

 

The second approach, combining and refining existing production use
specifications, has been embraced by the existing OGSA BES and JSDL
communities. The approach combines, extends, and profiles five existing
specifications to meet the PGI requirements: WS Addressing EndPoint
References, OGSA Basic Execution Services (OGSA_BES, or BES) [GFD.108], RNS
1.1 OGSA-WSRF Basic Profile 1.0 [GFD.172], WS-Iterator 1.0 [GFD.188], and
OGSA-ByteIO WSRF Basic Profile 1.0 [GFD.98].

 

The BES/JSDL extensions described in this document are a part of the second
approach. Along with the BES Basic Directory Profile (BDP) and the Activity
Endpoint Profile (AEP) the BES/JSDL extensions meet the PGI requirements.
Profiled JSDL extensions and their corresponding additions to BES factory
attributes include: incorporation of GLUE2 [] compute resource properties,
arbitrary name/value pair matching parameters, additional file system types,
and richer file staging options. The profiled BES extensions include a
substate model with a set of "Held" substates and pre-and-post-processing
substates, a "ResumeActivities" porttype, and clarified JSDL mechanism to
subscribe to notifications.

 

The document is nearing completion. Areas in YELLOW need discussion and
decision.

Document 2: BES Directory Profile

The BES Directory Profile (BDP) is a profile on OGSA Basic Execution
Services 1.0 that provides a Unix directory like interface to OGSA BES
endpoints that allow the client to examine and modify BES configuration
information as well as list, create, and terminate activities. The profile
defines no port-types; rather it simply describes what directory elements
MUST exist in a compliant implementation and what the semantics are of
interacting with those entries. The goal is to provide a simple uniform
mechanism to support requirements identified by the Production Grid
Interoperability Working Group of the Open Grid Forum [cite]. The mechanism
described for the BDP is independent of the OGSA BES specification. Thus,
changes in the OGSA BES specification in the future will not impact the
usefulness of the BDP.

Document 3: Activity Endpoint Profile

The Activity Endpoint Profile is a profile on the EndPointReference returned
by an OGSA Basic Execution Services CreateActivity call. It defines
port-types that the endpoint must support, and values that MUST be returned
from calls and values that MAY be returned. The goal is to provide a uniform
mechanism to support requirements identified by the Production Grid
Interoperability Working Group of the Open Grid Forum [cite].

 

 

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