MOEKLINNS Lab, Department of Computer Science and Technology, Xi'an Jiaotong University, Xi'an, China.
PLoS One. 2019 Apr 3;14(4):e0214809. doi: 10.1371/journal.pone.0214809. eCollection 2019.
The cloud-based media streaming service is a promising paradigm for multimedia applications. It is attractive to media streaming service providers, who wish to deploy their media server clusters in a media cloud at reduced cost. Since the real-time live streaming service is both a bandwidth-intensive and quality-sensitive application, how to optimize the internal bandwidth utilization of a data center network (DCN) as well as guarantee the external bandwidth of the real-time live streaming application, is a key issue of deploying virtual machine (VM)-hosted media server cluster in a media cloud. Therefore, in this study, we propose an external-bandwidth-guaranteed media server cluster deployment scheme in media cloud. The approach simultaneously considers the outside bandwidth requirement of a tree-based media server cluster for live streaming and the intra-bandwidth consumption of a DCN. The proposed scheme models the optimal problem as a new terminal-Steiner-tree-like problem and provides an approximate algorithm for placing the media servers. Our evaluation results show that the proposed scheme guarantees the external bandwidth requirement of a real-time live streaming application, at the same time, greatly reduces the intra-bandwidth utilization of a media cloud with different DCN structures.
基于云的媒体流服务是多媒体应用的一种有前途的范例。它对媒体流服务提供商具有吸引力，这些提供商希望以降低的成本在媒体云中部署其媒体服务器集群。由于实时流媒体服务既是带宽密集型又是质量敏感型应用，因此如何优化数据中心网络（DCN）的内部带宽利用率以及保证实时流媒体应用的外部带宽，是在媒体云中部署虚拟机（VM）托管媒体服务器集群的关键问题。因此，在这项研究中，我们提出了一种在媒体云中保证外部带宽的媒体服务器集群部署方案。该方法同时考虑了基于树的媒体服务器集群的实时流媒体的外部带宽要求和 DCN 的内部带宽消耗。所提出的方案将最优问题建模为一个新的终端-斯坦纳树问题，并提供了一种用于放置媒体服务器的近似算法。我们的评估结果表明，所提出的方案保证了实时流媒体应用的外部带宽要求，同时，大大降低了具有不同 DCN 结构的媒体云的内部带宽利用率。
