一种面向SaaS环境的工作流系统集成和负载均衡方法  

A Method for Workflow System Integration and Load Balancing in a SaaS Environment

作　　者：张利永[1] 段荣[1] 罗恒钰[1] 

机构地区：[1]中国电子科学研究院,北京100041

出　　处：《中国电子科学研究院学报》2016年第4期417-424,共8页Journal of China Academy of Electronics and Information Technology

摘　　要：Saa S环境下的租户共用软硬件基础设施,负载均衡是实现可扩展、高性能Saa S系统的关键技术之一。本文关注Saa S环境下的工作流管理系统,研究其Saa S使能技术。首先,提出一种Saa S使能的工作流管理系统集成架构Wf MS4Saa S;然后,重点研究工作流引擎的负载均衡方法,提出一种主动式的工作流引擎负载预测算法,根据引擎的当前负载和预测的执行开销调度流程执行请求。实验表明,本文的方法考虑了流程多样性带来的负载影响,可以更加公平地利用工作流引擎资源,更适合面向多租户使用的Saa S环境。Achieving load balancing is essential to ensure better scalability and higher performance for a Saa S environment,in which requests from different tenants are satisfied concurrently by a single service instance over shared hosting resources. In this paper we focus on Saa S-enabling workflow management system（ Wf MS）. First,we explore some key issues in architecting a Wf MS that enables Saa S model and propose our prototype-Wf MS4 Saa S. Then we propose a proactive load balancing algorithm,by which requests from different tenants are scheduled according to workflow engines＇ current capability and the predicted cost of executing the process instances. The experimental results show that the algorithm can distribute workload more fairly when continually executing diverse workflow processes on uniform workflow engines than the formerly presented ones,and thus more suitable for Saa S Environment.

关 键 词：软件即服务(SaaS) 工作流 负载均衡 

分 类 号：TP315[自动化与计算机技术—计算机软件与理论]