Evaluating degrees of tenant isolation in multitenancy patterns: A case study of cloud-hosted Version Control System (VCS)

Abstract

Abstract-One of the key concerns of implementing multitenancy (i.e., serving multiple tenants with a single instance of an application) on the cloud is how to enable the required degree of isolation between tenants, so that the required performance of one tenant does not affect other tenants. There is little research which provides empirical evidence on the required degree of isolation between tenants under different cloud deployment conditions. This paper applies COMITRE (COmponent-based approach to Multitenancy Isolation Through request RE-routing) to empirically evaluate the degree of isolation between tenants enabled by multitenancy patterns for cloud-hosted Version Control System (VCS). We implemented three multitenancy patterns (i.e., shared component, tenant-isolated component, and dedicated component) by developing a multitenant component using the FileSystem SCM plugin integrated within Hudson. The study revealed that dedicated component provides the highest degree of isolation between tenants (compared to shared component and tenant-isolated component) in terms of error% (i.e., the percentage of errors with unacceptably slow response times) and throughput. System load of tenants showed no variability, and hence did not influence the degree of tenant isolation for all the three multitenancy patterns. We also provide some recommendations to guide an architect in implementing multitenancy isolation on similar VCS tools like Subversion and CVS.

Evaluating the Effect of Multi-Tenancy Patterns in Containerized Cloud-Hosted Content Management System

“…They also evaluated the performance of these patterns through a series of experiments and summarize a set of valuable conclusion and best practices on how to design a multi-tenant data model. [18] evaluated the degree of isolation among tenants using a component based approach to multi-tenancy through rerouting. This evaluation followed an empirical studies approach, where they implemented the three identified multitenancy patterns in a multi-tenant component of Hudson's file system.…”

Evaluating Degrees of Isolation between Tenants enabled by Multitenancy Patterns for Cloud-hosted Version Control Systems (VCS)

“…One of the main challenges of implementing multitenancy is how to ensure that there is isolation between tenants (hereafter referred to as multitenancy isolation) sharing components of an application, for example, a cloud-hosted application [1] [2] [3]. As software tools are increasingly being deployed on the cloud for software development, there is need to properly isolate a tenant's code files and processes so that the required performance, resource utilization, and access privileges of one tenant does not affect other tenants.…”