동적 이기종 캐시 서버 네트워크에서의내결함성 캐싱 시스템 설계 및 구현

Abstract

This study proposes a fault-tolerant caching system to address the issue of caching content imbalance caused bythe dynamic departure and participation of cache servers in a heterogeneous cache server network, and validatesit in both real and virtual environments. With the increase of large-scale media content requiring various types andresolutions, the necessity of cache servers as key components to reduce response time to user requests and alleviatenetwork load has been growing. In particular, research on heterogeneous cache server networks utilizing edgecomputing and low-power devices has been actively conducted recently. However, in such environments, theirregular departure and participation of cache servers can occur frequently, leading to content imbalance amongthe cache servers deployed in the network, which can degrade the performance of the cache server network. Thefault-tolerant caching algorithm proposed in this study ensures stable service quality by maintaining balance amongmedia contents even when cache servers depart. Experimental results confirmed that the proposed algorithmeffectively maintains content distribution despite the departure of cache servers. Additionally, we built a networkcomposed of seven heterogeneous cache servers to verify the practicality of the proposed caching system anddemonstrated its performance and scalability through a large-scale cache server network in a virtual environment.