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Java-Based Adaptive Web Caching

Java-Based Adaptive Web Caching. CS-526 Fall 2002 Semester Project G. Williams. Adaptive Web Caching. Related Work - Lixia Zhang, Sally Floyd, and Van Jacobson, "Adaptive Web Caching," April 25, 1997. Problem - Data dissemination to thousands or millions of users on the Internet.

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Java-Based Adaptive Web Caching

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  1. Java-Based Adaptive Web Caching CS-526 Fall 2002 Semester Project G. Williams

  2. Adaptive Web Caching • Related Work - Lixia Zhang, Sally Floyd, and Van Jacobson, "Adaptive Web Caching," April 25, 1997. • Problem - Data dissemination to thousands or millions of users on the Internet. • Solution - Web Multicasting and Caching

  3. Adaptive Web Caching • IP multicast serves two purposes • The most efficient way to deliver the same data to multiple receivers. • An information discovery vehicle. For example, a host can multicast a query to a relevant group when it does not know exactly whom to ask.

  4. Proposed Approach • Researched some exisiting “Adaptive” caching servers, primarily Squid. • Developed an Adaptive Web Caching (Proxy) Server “proof-of-concept” based on ideas from Zhang, Floyd, and Van Jacobson.

  5. Custom Enhancements • Web servers don’t need to implement multicasting to deliver content - This allows existing web servers on the Internet to be used with the system • Servers share cached content dynamically – Local Cache is populated by snooping data being sent amongst servers in the multicast group.

  6. Sample Configuration # Multicast Proxy Server Configuration File # Port Number, Default 8080 Port 8080 # Cache Directory CacheRoot=cache # Default TTL for a cached document in minutes CacheDefaultExpire 15 # Multicast Group Address MulticastGroupAddress 228.5.6.7 # Multicast port on which to send requests MulticastRequestPort 1234 # Multicast port on which to receive replies MulticastResponsePort 6789 # The maximum time in milliseconds to wait for a response before # retrieving the document from the origin server. MaxResponseWaitTime 500

  7. “Proof-of-Concept” Test Cases • Stand-Alone Server • No Multicasting • Multiple Cache Updates • two or more instances sharing cache data • Retrieve Content from Group • Request from neighbors before contacting the origin server • Adaptive Caching • Adding more servers to a group, no changes required – system adapts.

  8. References • Project Web Page (Source Code, Documentation etc.) http://cs.uccs.edu/~gawillia/project.html • [FLOYD97] Lixia Zhang, Sally Floyd, and Van Jacobson, "Adaptive Web Caching," April 25, 1997.http://cs.uccs.edu/~cs526/advancedCache/floydPosition.pdf • [RFC 2616] Hypertext Transfer Protocol - HTTP/1.1, Request for Comments http://www.ietf.org/rfc/rfc2616.txt • [RFC 1112] Host Extensions for IP Multicasting, Request for Comments http://www.faqs.org/rfcs/rfc1112.html • [IANA]: Internet Assigned Number Authority, Internet Multicast Addresseshttp://www.iana.org/assignments/multicast-addresses • [SQUID02] Squid Web Proxy Cache http://www.squid-cache.org/

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