Chapter 1: Distributed Systems: What is a distributed system?
Chapter 1: Distributed Systems: What is a distributed system?
Chapter 1: Distributed Systems: What is a distributed system?
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Challenges: Scalability (cont.)<br />
� Controlling the cost of physical resources<br />
� Controlling performance loss<br />
� Preventing software resources running out<br />
� Avoiding performance bottlenecks<br />
� Mechan<strong>is</strong>ms (implement functions) & Policies (how to use<br />
the mechan<strong>is</strong>ms)<br />
� Scaling solutions<br />
� asyncronous communication, decreased messaging (e.g.,<br />
forms)<br />
Kangasharju: <strong>D<strong>is</strong>tributed</strong> <strong>Systems</strong><br />
� caching (all sorts of hierarchical memories: data <strong>is</strong> closer to<br />
the user � no wait / assumes rather stable data!)<br />
� d<strong>is</strong>tribution i.e. partitioning of tasks or information (domains)<br />
(e.g., DNS)<br />
October 23, 08<br />
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