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The global computational grids bring together distributed computation/communication resources. Beyond this, the paper envisions the emergence of global 'Service grids', which provide a 'Market' of application-level distributed services for clients to discover and to request. This paper studies the issue of wide-area service discovery in service grids. The paper starts with an existing basic wide-area service discovery framework. The framework adopts a scalable architecture consisting of a hierarchy of Discovery Servers. The paper then identifies problems with the basic framework, and proposes the enhancement of query responsiveness and QoS awareness. The key techniques introduced include: the addition of QoS feedback capability to clients; and the caching and propagation of discovery results with QoS feedbacks in the discovery server hierarchy.
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