Research and Implementation of Dynamic Reconfiguration Technology in Distributed System
分布式系统动态配置技术的研究与实现

Dynamic reconfiguration aims to evolve distributed systems online by changing systems' configurations at runtime.How to preserve system consistency and to improve reconfiguration performance are the key issues in the re- search of dynamic reconfiguration.The paper presents behavioral consistency and summarizes the system consistency as:behavioral consistency,component state consistency,application state consistency and reference consistency.By extending the quiescent state theory,the paper proposes algorithms to drive component into quiescent state in waiting or holding mode so that the behavioral consistency is preserved.Based on the analysis of reconfiguration intentions and by choosing proper mode to drive component into quiescent state,the paper presents reconfiguration algorithms which improve reconfiguration performance as much as possible with the precondition that system consistency is preserved strictly.Finally,the paper implements the reconfiguration platform based on CCM,which is proven to meet the per- formance requirement of applications through the performance test.