10.5281/zenodo.1237804
https://zenodo.org/records/1237804
oai:zenodo.org:1237804
Li, Jian
Jian
Li
University of Massachusetts Amherst
Phan, Truong Khoa
Truong Khoa
Phan
University College London
Chai, Wei Koong
Wei Koong
Chai
Bournemouth Univerisity
Tuncer, Daphne
Daphne
Tuncer
University College London
Pavlou, George
George
Pavlou
University College London
Griffin, David
David
Griffin
University College London
Rio, Miguel
Miguel
Rio
University College London
DR-Cache: Distributed Resilient Caching with Latency Guarantees
Zenodo
2018
2018-04-17
10.5281/zenodo.1237803
https://zenodo.org/communities/eu
Creative Commons Attribution 4.0 International
The dominant application in today’s Internet is content streaming, which is increasingly relying on caches to meet the stringent conditions on the latency between content servers and end-users. These systems routinely face the challenges of limited bandwidth capacities and network server failures, which degrade caching performance. In this paper, we study the problem of optimally allocating content over a resilient caching network, in which each cache may fail under some situations. Given content request rates and multiple routing paths, we formulate an optimization problem to maximize the expected caching gain, i.e., the reduction of latency due to intermediate caching. The offline version of this problem is NP-hard. We first propose a centralized, offline algorithm and show that a solution with (1-1/e) approximation ratio to the optimal can be constructed. We then propose a distributed ascent algorithm based on the concave relaxation of the expected gain. Informed by the results of our analysis, we finally propose a distributed resilient caching algorithm (DR-Cache) that is simple and adaptive to network failures. We show numerically that DR-Cache significantly outperforms other candidate algorithms under synthetic requests, as well as real world traces over a class of network topologies.
European Commission
10.13039/501100000780
761699
Programmable edge-to-cloud virtualization fabric for the 5G Media industry