Quilt: a patchwork of multicast regions

  • Authors:
  • Qi Huang;Ymir Vigfusson;Ken Birman;Haoyuan Li

  • Affiliations:
  • Huazhong University of Science and Technology and Cornell University;IBM Haifa Research Lab;Cornell University;Cornell University

  • Venue:
  • Proceedings of the Fourth ACM International Conference on Distributed Event-Based Systems
  • Year:
  • 2010

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Abstract

Network bottlenecks, firewalls, restrictions on IP Multicast availability and administrative policies have long prevented the use of multicast even where the fit seems obvious. The confusion around multicast poses a problem for large-scale pub/sub-based applications that need blazing speed even across WAN networks. There are a number of multicast protocols, but none is universally available. Thus relatively few applications are able to exploit multicast technology. Here, we present Quilt, a system that automatically weaves a patchwork of multicast regions each running different protocols, creating an efficient and scalable wide-area overlay. By dynamically exploring the environment at and between end-hosts, Quilt clusters nodes into patches, selecting the best multicast protocol from a developer-provided set on a patch-by-patch basis and adapting as needed. Quilt orchestrates inter-patch forwarding to maximize reliability while minimizing duplication. This paper discusses and then evaluates the system. We find that Quilt is an effective, backwards compatible option for supporting multicast wide-area networks.