Katherine Guo

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Content distribution networks (CDNs) using storage clouds have recently started to emerge. Compared to traditional CDNs, storage cloud-based CDNs have the advantage of cost effectively offering hosting services to Web content providers without owning infrastructure. However, existing work on replica placement in CDNs does not readily apply in the cloud. In(More)
This paper presents a closed-loop (demand-driven) approach towards VoD services, called multicast with caching (Mcache). Servers use multicast to reduce bandwidth usage by serving multiple requests using a single data stream. However, this requires clients to delay receiving the movie until the multicast starts. Using regional cache servers, Mcache removes(More)
Existing solutions for streaming multimedia in the Internet do not scale in terms of object size and number of supported streams. Using separate unicast streams, for example, will overload both network and servers. While caching is the standard technique for improving scalability, existing caching schemes do not support streaming media well. In this paper,(More)
Network-level redundancy elimination (RE) algorithms reduce traffic volume on bandwidth-constrained network paths by avoiding the transmission of repeated byte sequences. Previous work shows that RE can suppress the transmission of 20-50% bytes when deployed at ISP access links or between routers. In this paper, we focus on the challenges of deploying RE in(More)
Multicast is an efficient means of transmitting the same content to multiple receivers while minimizing network resource usage. Applications that can benefit from multicast such as multimedia streaming and download, are now being deployed over 3G wireless data networks. Existing multicast schemes transmit data at a fixed rate that can accommodate the(More)
Multipoint communication protocols that offer group membership and virtually synchronous message delivery are commonly believed to be heavyweight and non-scalable. To meet the needs of large-scale computer-supported collaborative work, distributed parallel computing, and future worldwide applications, we designed the Structured Virtual Synchrony (SVS)(More)
Many scalable reliable multicast protocols use the local repair scheme where certain receivers retransmit packets by other receivers. Such schemes need a mechanism, called message stability, to ensure reliable delivery to all members of a multicast group and to delete those packets received by all members from the buffers of the local repairers. We propose(More)
The virtual synchrony model for group communication has proven to be a powerful paradigm for building distributed applications. Implementations of virtual synchrony usually require the use of failure detectors and failure recovery protocols. In applications that require the use of a large number of groups, significant performance gains can be attained if(More)