A Performance Study of Color-Based Cooperative Caching in Telco-CDNs by Using Real Datasets

Content Delivery Networks managed by Telecommunications companies (Telco-CDNs) can be considered as a solution to significantly reduce traffic by deploying content servers deeper inside the network of Internet Service Provider (ISP), which helps network operators meet the rapid growth of Video-on-Demand (VoD) services. The recent color-based strategy has proven its impressive performance in utilizing simple color tags to effectively distribute contents across such a network. In previous studies, the color-based caching algorithm was proven to be the most practicable technique to reduce traffic in Telco-CDNs. However, all of the experiments were performed on a simulated dataset generated from the gamma distribution. Therefore, the reliability of the results is not high. This work verifies the feasibility of the color-based approach by reproducing the experiments on traces of real accesses at our server. The empirical results on our dataset show that the color-based caching using 4 colors coupled with its routing strategy gives the best performance in most of our cases, among some other variants and the LFU caching approach. As inserting 455 new contents, the hybrid feature helps the color-based approach to improve 8.1% hit rate compared to the single cache area.