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Req. Nb	ID	Description	Source	Areas	Dependencies	Status	Date
JM9	76	In order to permit the Client to perform client-directed processing of submitted Activities (for example client-directed data staging), the Execution Service SHOULD manage 'Hold' points for Activities. Fault if not supported.	Strawman functionality	Activity Management	Conflicts with JM8	Proposed	2010-03-18

'Client-directed processing of submitted Activities' is a Use Case existing for historical reasons, when Data Management was underestimated
This Use Case is contrary to the principle of 'Full Automation of Processing'
This Use Case generates 'Hold' points for Activities, which have to be implemented in 'Hold' states inside the State Model, and make this State Model very complicated
'Manual Data Staging' can easily been replaced by 'Data Pre-Staging' and 'Data Post-Stating' to and from Storage Resources (GLUE StorageService), occurring OUTSIDE the life time of the Activity, plus Automatic Data Staging specified inside the JSDL
IT experience shows that 'Execution of Activity' is only a little part of 'Data processing', which must begin with careful 'Data Management'
So I consider this Use Case as NOT belonging to good practices, and I vote AGAINST this requirement

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