GOCDB/Release4/Development/GLUE2Compatibility
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Background
GLUE2 defines an OGF standard for describing data similar in scope to the GOCDB data (Sites, Admin Domains, Services, Service Endpoints, Downtimes etc). A proposal exists for GOCDB to generate valid GLUE2 XML documents and expose these via the PI.
Useful links:
- [Glue2 Gridforge home]
- [GLUE2.xsd]
- [Latest Glue2.xsd on Github]
- [Sample Docs]
- [GOCDB GLUE2 Compatiblity, EGI UF 2012 Munich]
- [Proposal to update the GLUE2 XSD] The glue2 working group is currently considering a proposal to introduce AbstractService and AbstractEndpoint elements into the glue2.xsd with accompanying xsd:substitutionGroups to define concrete service and endpoint elements.
Data Models and Downtimes
There is a difference between the GOCDB and GLUE2 data models. In GLUE2, downtimes are defined against individual Endpoint entities, while in GOCDB downtimes are defined against the Service as a whole (the ServiceEndpoint entity).
To address this issue we propose the following:
- A service in gocdb currently links to one ‘Endpoint_Location’ entity, which in turn wraps the service's URL (other glue2 Endpoint attributes such as WSDL can easily be added to the Endpoint_Location entity).
- We are planning to make the cardinality of this relationship one-to-many.
- In doing this, with a bit of query2Xml conversion, it will be possible to generate GLUE2.xsd compatible documents from the gocdb data.
- Since GLUE2 defines only one downtime per Service Endpoint (the next/current downtime), the proposed GOCDB GLUE2 docs would only show the next/current downtime for the service (historical and future downtimes would be excluded).
GOCDB to GLUE2 Mapping
The diagrams below show how the GOCDB data maps to the GLUE2 XML rendering.