Distributed Systems Topologies: Part 2
Subject:   Centralized and Decentralized systems
Date:   2003-01-01 10:22:43
From:   anonymous2
Hello Nelson Minar,

I have red your great article dated on 14/12/2001 and its title is
“ Distributed Systems Topologies: Part 1”
I found myself confused to distinguish between the
Please can you answer me the following questions
To become clear to me the distinction B/W these two systems:
1. does “Decentralized system” same as the “Distributed system”
in concept? And just the difference in terms only?
2. what is the major difference B/W “Centralized system” and “Distributed system”?
is the difference that: in Centralized system all the Applications interfaces, computational process(functionalities), and data retrieval are in the central machine(such as Mainframe) where as the clients are dummies and do not contribute in any functionality except as I/O devices(i.e. clients are just keyboards and monitors. And do not have processors and storage devices in themselves).
And in Distributed system not all the functionality are in the central machine(server). instead, the clients share the server in some computational process and functionality(therefore they are not dummies in the sense that they have processors and storage devices, …etc).
3. you mentioned that : “The debate between centralized and decentralized systems is fundamentally about topology -- in other words, how the nodes in the system are connected. Topology can be considered at many different levels: physical, logical, connection, or organizational.”
Can you make it clear to me the difference between:
“Physical and Connecting” and between
“Logical and Organizational” in the context.
4. You mentioned: “Centralized+Centralized” and
“Centralized+DeCentralized” as two of the Basic Distributed systems topologies.
Did you mean that, in the “Centralized+Centralized” there is NO connection between the clients themselves(here, in this case the stacked servers which are central nodes for other nodes), but the connection is between each of them to the central server directly. where as in the “Centralized+DeCentralized” there is a connection between them and this connection is also connected to the central machice(server)?

Thank you for your time and efforts.
With lot of respect

Hikmat Jaber

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  1. Nelson Minar photo Centralized and Decentralized systems
    2003-02-17 10:05:37  Nelson Minar | O'Reilly Author [View]

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