基于MMTD的复制策略研究及算法设计

REPLICATION STRATEGY RESEARCH BASED ON MMTD AND ITS ALGORITHM DESIGN

主动复制和被动复制各有优缺点。分析主动复制和被动复制的过程,得出两者在响应进程的副本数目、处理时间上存在对立性。引入处理模糊信息的中介数学系统,将主动复制和被动复制视为一对反对对立面。提出副本协调时间、副本更新时间和副本恢复时间的概念。在此基础上应用中介真值程度的数值化度量MMTD(Measure of Medium Truth Degree)设计出了一种新的复制算法,新算法结合了主动复制和被动复制的优点,更具有实用性和有效性。

Active replication and passive replication have their advantages and disadvantages respectively.In this paper the authors analysed the processes of active replication and passive replication,and found that they oppose each other on copy number and processing time of the responding course.The paper introduces medium mathematics system,which is employed to process the fuzzy information.The active replication and the passive replication are regarded as a pair of inverse opposites.The coordination time,update time and recovery time of the copy are conceptualised.On these bases,a new replication algorithm is designed based on numerical measuring of medium truth degree（MMTD）.The new algorithm combines the advantages of active replication and passive replication,so it is more practical and effective.