CSF4: A WSRF Compliant Meta-Scheduler. In a grid computing environment, heterogeneous resources are distributed in multiple VOs which may have different local policies. Hence, scheduling and resource management are challenging tasks in this context. Since a meta-scheduler is able to provide a virtualized resource access interface to end users, and enforce global policies for both resource providers and consumers as well, it plays more and more important roles in computational grids. In this paper, the design and implementation of Community Scheduler Framework 4.0(CSF4) will be discussed. CSF4 is a WSRF compliant community meta-scheduler, and released as an execution management service of GT4. Using CSF4, the users can work with different local job schedulers, which may belong to different domains. Moreover, the Pre-WS-GRAM protocol is also supported by CSF4, although it is based on WSRF specifications. Therefore, CSF4 can be deployed in a GT4 and GT2 mixed grid environment, which is very convenient for the users who have legacy applications.

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