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Explain Scalability Requirement
It is the ability of a computer application or product (hardware or software) to continue to function well as it (or its context) is changed in size or volume in order to meet a user need.
Name the definitions of Distr.Sys.
-hard- and software components
-based on different but connected computers
-communicate with each other based on specific protocol
-Interchange messages with each other
What does the advantage "Scalabililty&Flexibility" mean?
Incremental in-/decrease of the computing power as well as the load balance is possible
What is communication overhead
- Communication overhead is any type of excess data during communication.
Describe Migration Transparency
Users should not be aware of whether a resource or computing entity possesses the ability to move to a different physical or logical location.
Three main parts of "function sharing"
-Finding Services (who offers what kind of service?)
-Binding (How do i connect to a service)
-Data Transfer (Method Calling and transferring Object)
Explain Synchronous Communication
-Temporary Binding between Client and server
-Client blocks server and vice versa
e.g. Telephone call
Explain "Resource Based" (REST)
REST is resource oriented
-one resource for one use case
-one URL for one use case
Difference between GET / POST (REST)
- GET retrieve copy of a resource
- POST create resource
4 elements of Webservice protocoll stack
- Discovery
- Description
- Messaging
- Transport
Explain Asynchronous Communication
-No temporary binding between client and server
-Client/server handle request when/if they would like/can to
e.g. Email, Bulletin Board
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