移动计算中维持可靠通讯链路的组件迁移

Migrating Component Mechanism for Maintaining Reliable Communi ca tion Links in Mobile Computation

为了解决分布式系统中的动态负载均衡、容错、动态资源利用、隐式的颗粒度控制等问题,透明的组件迁移技术起了非常重要的作用。该文描述了一种在动态网络拓扑中有效地维持系统组件之间通讯链路的迁移机制,并考虑了对并发迁移情况的处理。提出的机制只用到较少的系统拓扑知识,在迁移过程中不阻塞进程,而只要求迁移组件本身停止计算,因而对非迁移系统组件的影响被减至最低。此迁移算法虽然是在移动代理系统中实现,但原理同样适用于其它分布式系统。

In order to solve the problems of dynamic load balancing,fault tolerance,dynamic resource utilization,and implicit granularity control etc,transparently migrating component technique plays a very important role in the distributed systems.This paper describes a migration mechanism for maintaining communication links efficiently between system components in a dynamically changing network topologies,and how to handle concurrent migration.The presented mechanism uses minimal knowledge of the system topologies.During migration,the mechanism doesn't block process,only requires the component being moved to stop computing in transit.It has minimal effect on the performance of the non-migrating components of the system.Although this migrating algorithm is implemented in mobile agent system,it is also suitable for the other distributed system.