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Content Networking - CON Content Overlay Network

Content Networking - CON Content Overlay Network. Vishal Kumar Singh Eilon Yardeni April, 28 th 2005. Agenda. Motivation Our solution – Content Overlay Network Overview Architecture Implementation Demo plan Future work Conclusions. Motivation. Problems High access latency

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Content Networking - CON Content Overlay Network

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  1. Content Networking -CON Content Overlay Network Vishal Kumar Singh Eilon Yardeni April, 28th 2005

  2. Agenda • Motivation • Our solution – Content Overlay Network • Overview • Architecture • Implementation • Demo plan • Future work • Conclusions

  3. Motivation • Problems • High access latency • High network load • High server load • Web Caches solves this for some extent • Web Cache serves localized clients • On Cache miss, Web Cache access the Origin Server

  4. Content Overlay NetworkOverview • Distributing Web Caches • Overlay Network of Web Caches • Overlay Nodes share cached content • On Cache miss, nodes access the “closest” node that has the object • Nodes propagate cache tables • Nodes perform distance measurement protocol

  5. Propagate cache table update Client Client GET Object A GET Object A • Lookup in local Cache • Lookup in “adjacent” nodes Cache • Fetch from Origin Server • Serve client Architecture Origin Server Overlay Node Overlay Node A Overlay Node A Overlay Node Overlay Node • Lookup in local Cache • Lookup in “adjacent” nodes Cache • Fetch from Adjacent node • Serve client

  6. Content Overlay NetworkImplementation • Distance Measurement Protocol • UDP based RTT measurements • n2 measurements • Performed in the background • Cache table propagation • Each node periodically propagates its cache table diffs to all the other nodes

  7. Content Overlay NetworkImplementation (Cont.) • On Cache miss • Lookup in local cache table • If found serve the client • Lookup in “adjacent” nodes cache tables • If found and distance is smaller than a threshold: fetch content from node and serve the client • Update local cache if required • Access the Origin Server • Update local cache and serve the client

  8. Demo plan • 3 overlay nodes: A,B and C • Browser use A as a proxy • Cache miss updates A’s cache • Browser use B as a proxy • Cache miss fetch object from A

  9. Future work • Measure distance to Origin Servers • Integrate with open-source Web Cache • Use DNS measurements • Overlay bootstrap protocol • Overtake Akamai…

  10. Open discussion

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