Abstract
Context recovery can improve the efficiency of web service replacement. In order to solve the problem that when to do service context migration, this paper proposes an algorithm of context migration timing judgment which is based on the initial state, real time availability and availability changes of web service. According to this algorithm, we can determine whether to do service context migration at any time. Finally, experiments show that this method can reduce the waiting time of service replacement effectively compared with the passive one-time migration method.
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