![]() ![]() ![]() ![]() Job submission/managementFile transferData managementMonitoring– Tools and examples Programmatic APIs Security mechanisms– Grid development environment – Basic infrastructure services What’s included?– Framework for developing OGSA Grid services What is the GTK?Globus Toolkit WSRFWS-ResourcePropertiesBase fault type WS-BaseFaultsServiceGroup portTypes WS-ServiceGroupFactory portType Treated as a patternNotification portTypes WS-NotificationGridService lifetime mgmt WS-ResourceLifeCycleService data defn & accessHandleResolver portType WS-RenewableReferencesGrid Service Handle WS-Addressing EndpointReferenceGrid Service Reference WS-Addressing EndpointReferenceOGSIWSRF – Web Service Resource Framework – WSRF separates the service and its state (resources) OGSI (base for GT3) replaced by WSRF (base forGT4)– Too much stuff all in one specification– Doesn’t work well with existing web service tools (tooheavy on XSD, etc.)– Too object oriented(instances, handles, etc.) Problems found with OGSIThe Downfall of OGSI – Defined Grid service interfaces, lifecycle, conceptof Grid service instances, references, and handles Stateful Web services Extended WSDL– Formal specification of concepts described byOGSA– Specifies extensions to standard Web servicesneeded for Grid services What is OGSI?OGSI – Open Grid Services Infrastructureġ Grid Service ReferenceOGSI ModelGrid Service Handle (URI)Grid Service Instance(s) – Request- Response/Producer- Consumer Web Services employ the client-serverarchitecture and provide interoperableinterfaces to applications Intended for use by other software, NOTdirectly by users.Web Services Overview – OGSA defines a Grid system architecture based on welldefined standards and Web service technologies– Service Oriented Architecture based Grid services providewell-defined interfaces for clients– All grid resources (logical & physical) are modeled asservices What is OGSA?– Interoperability: Critical due to nature of heterogeneousenvironments– Virtualization: virtual representation of organizations,resources, applications What are some key requirements of Grid computing?OGSA – The Open Grid Services Architecture 2007Michael RokitkaGlobus – GTK and Grid Services ![]()
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