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By Zhang Sh.

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Extra info for A cache considering role-based access control and trust in privilege management infrastructure

Example text

These experimental observations of invocation failures show us that (1) Web service invocations can fail easily, which can be caused by gateway errors, networking errors, and server errors. (2) In the service-oriented environment, providing reliable Web services is not enough for building reliable service-oriented systems, since most invocation failures are caused by network errors. (3) Since the Web service invocation failures are unavoidable in the unpredictable Internet environment, service fault tolerance approaches [11, 18] are becoming important for building reliable service-oriented systems.

11a, b show the overall throughput value of different Web services and service users, respectively. 11a shows that (1) similar to the response time, standard deviation of throughput increases with the mean value. (2) Influenced by the poor server-side network conditions, there is a small part of Web services providing a very poor average throughput (<1 kbps). 11b shows that (1) influenced by the client-side network conditions, different service users receive quite different average throughput on the target Web services.

No process was listening on the remote address/port). • Read Timed Out: Timeout occurred on socket read. • UnknownHostException: The IP address of a host could not be determined. • Connect Timed Out: A timeout has occurred on a socket connect. • Other Failures: The type of these invocation failures cannot be identified due to lack of failure information. 6, about 85% of these failures are due to socket connection problems, including 44,809 Connect Timed Out and 4,606 Read Timed Out. These timed out exceptions are caused by network connection problems during socket connection and socket read.

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