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[geclipse-dev] Information on JSDL and workflows
Hi all,

After the discussion we had during our meeting yesterday in regard to the use of JSDL in workflows, i come across the following information that maybe useful.

This was obtained through the JSDL experience survey that the "C3Grid" project has submitted to OGF's JSDL-WG. Apparently C3Grid is developing a Grid technology solution for Earth System Science and one of their main concerns is the support of workflows using JSDL. Below i quote their remarks on the above.

"A major concern of our project was the support of workflows. Within C3Grid, a simple, proprietary XML dialect for DAG-style job definitions has been designed and implemented. However, JSDL does not directly support the connection of output files from one job to input files of another job.

To overcome this deficiency, the <jsdl:DataStaging> “name” attribute has been used for this: the workflow engine detects identical values of this attribute and connects the corresponding data staging elements from two JSDL definitions as input and output. Then, the scheduler dynamically inserts data transfer tasks into the workflow depending on job and network allocation decisions.

To this end, the DataStaging contents are interpreted as follows:

  • No <jsdl:Source> and no <jsdl:Target> leads to an automatic transfer injection by the scheduler, depending on its decisions.

  • A <jsdl:Source> and no <jsdl:Target> leads to an import from a user-defined source to a scheduler-selected target, depending on its decisions. This applies to data within the workflow at the beginning of a branch within the graph.

  • No <jsdl:Source> and a <jsdl:Target> leads to an export from a scheduler-selected source (based on previous decisions) to a user-defined target. This applies to data within the workflow at the end of a branch within the graph.

Regarding the <jsdl:URI> element, project-specific namespaces are used."



If the above is considered to be useful, let me know and i can provide you the whole survey document.


Best regards,

Nicholas
-- 
_________________________________________________

Nicholas Loulloudes
High Performance Computing Systems Laboratory (HPCL)
University of Cyprus,
Nicosia, Cyprus

Tel:  +357-22892663
Email: loulloudes.n[at]cs.ucy.ac.cy

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