Network Status Observation for A Dynamic Object Relocation Protocol

the problem, a relocation protocol by an object reloMobile Cache Protocol (MCP) was proposed as a relocation protocol of a replicated object i n a widely distributed object system. MCP has four basic features; relocating a replicated object, 2 optimistic update methods, object reservation and object sharing. To calculate relocation funct ion, M C P uses processing t ime of the object at a candidate sate and predicted network delay between the client and the candidate. Thus, a client observes network status to eliminate the ambiguity. B u t the observation of the entire network may cause overhand and undesirable traffic. This paper proposes some solutions for the problem, i.e., collecting processing t ime information of partial network and probing delay by preceding ping. Though designed for a distributed object based system, MCP also can be applied to dynamic web caching. Evaluation using DEC web trace shows the effectiveness of these strategies.