Eventual and Strong Consistency

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Complete this quiz after reading the Eventually Consistent article. You should use your GW email below.

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74 points

Yes

It has been proven that a distributed system can only handle 2 out of 3 important properties. Select the 3 properties that this applies to below:

6 points

keeping data consistent

providing secure user authentication

making a system available for new requests at all times

handling partitions in the network that split replicas

using the mimimal amount of resources

What is the most commonly used example of an eventually consistent system according to Vogels? (your answer should be an abbreviation)

5 points

Vogels defines several variations of eventual consistency. Which of the following two variants must be more expensive than the other?

5 points

Causal Consistency

Session Consistency

Clear selection

Consider a quorum based system where N=10, W=8, and R=1. Which option below best describes the properties this system will provide?

5 points

Very fast reads that are always consistent

Very fast reads but data may not be consistent

Very fast writes that are always consistent

Very fast writes but data may not be consistent

Clear selection

Tim suggests building a system with N=10, R=5, W=5. Lucas says he should add another read or write replica, but Tim thinks the pay-off will be small and a new server is expensive. Who is right?

5 points

Tim is right, adding one more replica will slightly improve reliability, but not significantly.

Lucas is right, adding one more replica will dramatically improve reliability.

Clear selection

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