Architectures for Distributed Systems. Chapter 2. Definitions. Software Architectures – describe the organization and interaction of software components; focuses on logical organization of software (component interaction, etc.)
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Figure 2-1. The (a) layered architectural style & (b) The object-based architectural style.
Object based is less structured
component = object connector = RPC or RMI
Figure 2-2. (b) The shared data-space architectural style.
Data Centric Architecture; e.g., shared distributed file systems or Web-based distributed systems
Combination of data-centered and event based architectures
Processes communicate asynchronously
Figure 2-3. General interaction between a client and a server.
Figure 2-4. The simplified organization of an Internet search engine into three different layers.
Figure 2-5. Alternative client-server organizations (a)–(e).
Figure 2-6. An example of a server acting as client.
Circles represent nodes in the network. Blue nodes are also part of the overlay network. Dotted lines represent virtual links. Actual routing is based on TCP/IP protocols
Overlay Network Example
Figure 2-7. The mapping of data items onto nodes in Chord for m = 4
Figure 2-13. Viewing the Internet as consisting of a collection of edge servers.
Trackers know which nodes are active (downloading chunks of a file)
Tells how to locate the tracker for this file