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Second Workshop on Real, Large Distributed Systems—Preliminary Abstract
Pp. 31–36 of the Proceedings
(Re)Design Considerations for Scalable Large-File Content Distribution
Brian Biskeborn, Princeton University; Michael Golightly, University of California, Irvine; KyoungSoo Park and Vivek S. Pai, Princeton University
Abstract
The CoBlitz system was designed to provide efficient
large file transfer in a managed infrastructure environment.
It uses a content distribution network (CDN) coupled
with a swarm-style chunk distribution system to reduce
the bandwidth required at origin servers. With 6
months of operation, we have been able to observe its behavior
in typical usage, and glean information on how it
could be redesigned to better suit its target audience.
At its heart, this paper describes what happens when
a plausible conceptual design meets the harsh realities of
life on the Internet. We describe our experiences improving
CoBlitz's performance via a range of techniques, including
measurement-based feedback, heuristic changes,
and new algorithms. In the process, we triple CoBlitz's
performance, and we reduce the load it places on origin
servers by a factor of five. In addition to improving performance
for CoBlitz's users, we believe that our experiences
will also be beneficial to other researchers working
on large-file transfer and content distribution networks.
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