A Feedback Controlled Scheduler for Performance Isolation in Multi-Tenant Applications

Multi-tenancy is an architectural approach for sharing one application instance among different tenants. It is used to reduce operational costs of SaaS offerings. The major drawback of this approach is the potential mutual influence of one tenant onto the performance experienced by others. In this paper we present a combination of a traditional scheduling mechanism and a feedback control loop based controller to ensure performance isolation while efficiently utilizing the system and faster reaction to workload changes than a control cycle's duration.