By John G. Webster (Editor)
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Extra resources for 38.Networking
434 CLIENT–SERVER SYSTEMS Computer User interface/presentation Computational functions Data access (a) Client computer User interface Server computer Client computer Computational function User interface Data access Computational function Server computer Client computer Server computer User interface Computational function Computational function Data access Data access (b) Client computer Server computer Data server computer User interface Computational function Data access (c) Figure 2. One- (a), two- (b), and three-tier (c) client–server configurations.
Unreliable versus Reliable Primitives. Different catastrophic events, such as a computer crash or a communication system failure can happen in a distributed computing system. These can cause either a requesting message being lost in the network, a response message being lost or delayed in transit, or the responding computer ‘‘dying’’ or becoming unreachable. Moreover, messages can be duplicated, or delivered out of order. The primitives discussed previously cannot cope with these problems. These are called unreliable primitives.
NFS servers are designed to be stateless, meaning that there is no need to maintain information (such as whether a file is open or the position of the file pointer) about past requests. The client keeps track of all information required to send requests to the server. Therefore, NFS RPC requests are designed to completely describe the operation to be performed. Also, most NFS RPC requests are idempotent, meaning that an NFS client may send the same request one or more times without any harmful side effects.
38.Networking by John G. Webster (Editor)