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Constructing Efficient Overlays

Constructing Efficient Overlays. Problem formulation Given a set of subscribers and a set of machines, distributed in the Internet Construct an overlay tree to minimize the traffic/latency from the event source to the subscribers. Constructing Efficient Overlays (Cont.). Model 1

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Constructing Efficient Overlays

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  1. Constructing Efficient Overlays • Problem formulation • Given a set of subscribers and a set of machines, distributed in the Internet • Construct an overlay tree to minimize the traffic/latency from the event source to the subscribers

  2. Constructing Efficient Overlays (Cont.) • Model 1 • Subscribers cannot relay traffic • Restricted steiner tree • Developed a new approximation algorithm with a factor of 4.1 • Model 2 (p2p) • Subscribers can relay traffic • Minimum steiner tree problem • Apply existing approximation algorithms

  3. Load Balancing events • Given a set of machines • Machine i can handle Di rectangles as a dispatcher or Si rectangles as a server • Problem: • Which set of machines are servers, and which set of machines aredispatcher? • How to assign server machines to dispatcher machines? • Objective function min(max sj/Sj or dj/Dj) D D D S S S S S

  4. Four Variations of the Problem • Configured or not • Whether each machine is already configured to be a dispatcher or a server • Unique or not • Whether each server can only be assigned to a unique dispatcher or multiple dispatchers

  5. Approaches Optimization objective: min(max sj/Sj or dj/Dj)

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