Web Caching and Replication

9.2. Issues in Cooperative Proxy Caching

Cooperative proxy caching gives rise to two fundamental issues.

• How can a proxy find out which other proxies (if any) have a document it needs? We call this a location management problem of cooperative caching. Location management is discussed in Section 9.3.

• How can a proxy decide whether to fetch an object from a peer proxy or from the origin server? In a global network, the origin server may be closer or better connected than the proxy that has the requested object. We refer to this problem as a proxy pruning problem. We consider the pruning problem in Section 9.4.

Another issue that arises in cooperating proxies is how individual proxies cooperate to remove objects from the cache if no space is available ...