A method and system for distributed caching, prefetching and...

G - Physics – 06 – F

Patent

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Details

G06F 17/30 (2006.01) H04L 29/06 (2006.01) H04L 29/08 (2006.01)

Patent

CA 2290786

A technique for automatic, transparent, distributed, scalable and robust caching, prefetching, and replication in a computer network that request messages for a particular document follow paths from the clients to a home server that form a routing graph. Client request messages are routed up the graph towards the home server as would normally occur in the absence of caching. However, cache servers are located along the route, and may intercept requests if they can be serviced. In order to be able to service requests in this manner without departing from standard network protocols, the cache server needs to be able to insert a packet filter into the router associated with it, and needs also to proxy for the homer server from the perspective of the client. Cache servers may cooperate to service client requests by caching and discarding documents based on its local load, the load on its neighboring caches, attached communication path load, and on document popularity. The cache servers can also implement security schemes and other document transformation features.

L'invention se rapporte à une technique permettant la mise en antémémoire automatique, transparente, répartie, adaptable et fiable, ainsi que la prélecture et la reproduction de documents dans un réseau informatique. Cette technique nécessite que les messages concernant un document particulier suivent des voies, partant des clients et allant vers un serveur central, qui forment un graphe d'acheminement. Les messages correspondant aux demandes des clients sont acheminés le long du graphe en direction du serveur central comme cela se produirait normalement en l'absence de mise en antémémoire. Cependant, les serveurs à antémémoire sont situés le long de cette voie d'acheminement et peuvent intercepter les demandes s'ils peuvent les satisfaire. Afin de pouvoir satisfaire aux demandes de cette manière, c'est-à-dire sans s'écarter des protocoles de réseau normalisés, le serveur à antémémoire doit être capable d'insérer un filtre à paquet dans le routeur qui lui est associé, et également de faire office de serveur central du point de vue du client. Les serveurs à antémémoire peuvent coopérer dans le but de satisfaire aux demandes de clients par mise en antémémoire et suppression de documents sur la base de leur charge locale, de la charge de leurs antémémoires voisines, de la charge de voies de communication associées et de la "popularité" des documents demandés. Les serveurs à antémémoire peuvent également mettre en oeuvre des codes de sécurité et d'autres dispositifs de transformation de documents.

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