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Distribution and Layering (layer / tiers)  RSS feed

 
Greenhorn
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I am reading SCEA book by Mark Cade/Humphery Shell and in chapter 1. I am finding it difficult to understand "Distribution".

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Not able to understand following;

Page 15.

Distribution is among computational resources and Distribution is a primary technique for building scalable systems.

More often than not, if you decompose by layering (layer / tiers), you will not decompose by distribution and vice versa.

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Query:

I have read layer / tiers and in practice have observed my seniors practicing this and still QoS is achieved.
As per book, if you decompose by layering (layer / tiers), you will not decompose by distribution; and other statement is, Distribution is a primary technique for building scalable systems (sociability is part of QoS).

What I meant, first I failed to understand Distribution; and if I design something following layering (layer / tiers) still I would be taking care if QoS (scalable systems); if I follow layering then Distribution (technique for building scalable systems) is not need to follow (as either Distribution and Layering (layer / tiers) can be used for decomposition)?

confused:(.



 
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