Peter Pietzuch, Jonathan Ledlie, Margo Seltzer
Harvard University, Cambridge, MA
hourglass@eecs.harvard.edu
Large-scale distributed applications need latency information to
make network-aware routing decisions. Collecting these measurements,
however, can impose a high burden. Network coordinates are a
scalable and efficient way to supply nodes with up-to-date latency
estimates. We present our experience of maintaining network
coordinates on PlanetLab. We present two different APIs for
accessing coordinates: a per-application library, which takes
advantage of application-level traffic, and a stand-alone service,
which is shared across applications. Our results show that
statistical filtering of latency samples improves accuracy and
stability and that a small number of neighbors is sufficient when
updating coordinates.
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