Backup and Recovery Scheme for Multi-Agent-based e-Learning System

Abstract—We have developed a distributed asynchronous Web based training system. In order to improve the scalability and robustness of this system, all contents and a function that scores user’s answers are realized on mobile agents. These agents are distributed to computers, and they can obtain us-ing a P2P network that modified Content-Addressable Net-work. In this system, although entire services do not become impossible even if some computers break down, the problem that contents disappear occurs with an agent’s disappear-ance. In this study, as a solution for this problem, backups of agents are distributed to computers. If a failure of a com-puter is detected, other computer will continue service using backups of the agents belonged to the computer. The devel-oped algorithms are examined by experiments