2. DS Exemplified, Motivated, Defined

Question 1

Why do we Distribute Systems? (2 functional, 3 non-functional)

Answer 1

Functional:
Share Resources
Open proprietary processes up to external interaction for cooperation

Non-Functional:
Improve/keep performance to cost ratios

Scale elastically and modularly

Improve reliability and availability

Question 2

How do we define a DS?

Answer 2

Spatially separated components

Independent and self-sufficient

Heterogeneous and autonomous

Question 3

Characteristics of DS?

Answer 3

Computation is concurrent

There is no shared State

Failures occur and we may not know or be told

Question 4

Complex Consequences of DS? (2)

Answer 4

Communication: events have a duration, communication costs are significant, components communicate a different rates, uncertainty as to when and how long.

Process Data: components have different rates, Asynchrony is unavoidable, Do we stop and wait? How long for? Or do we continue and check some how?