Which of the following is/are correct?Question 5Select one or more:Select one or more:a.Eventual consistency ensures that data is eventually consistent in a distributed database system. Thus, no any read-write conflicts and write-write conflicts can occur under eventual consistency.b.Under eventual consistency, all servers eventually "converge" to the same state at some point in future.c.Eventual consistency does not order concurrent writes as they are executed.d.Eventual consistency guarantees that, if updates are made to a given data item, all reads to that item will return the same value.
Question
Which of the following is/are correct?Question 5Select one or more:Select one or more:a.Eventual consistency ensures that data is eventually consistent in a distributed database system. Thus, no any read-write conflicts and write-write conflicts can occur under eventual consistency.b.Under eventual consistency, all servers eventually "converge" to the same state at some point in future.c.Eventual consistency does not order concurrent writes as they are executed.d.Eventual consistency guarantees that, if updates are made to a given data item, all reads to that item will return the same value.
Solution
The correct statements are:
a. Eventual consistency ensures that data is eventually consistent in a distributed database system. However, it does not mean that no read-write conflicts or write-write conflicts can occur under eventual consistency. These conflicts can still occur during the period of inconsistency.
b. Under eventual consistency, all servers eventually "converge" to the same state at some point in future. This is true as the main idea behind eventual consistency is that all changes propagate through the system and eventually all replicas become consistent.
c. Eventual consistency does not order concurrent writes as they are executed. This is also true. In an eventually consistent system, there is no guarantee of immediate consistency across all nodes after a write operation.
d. Eventual consistency does not guarantee that, if updates are made to a given data item, all reads to that item will return the same value. This is because, in an eventually consistent system, it is possible for some nodes to see the updated value while others are still seeing the old value, until the update has fully propagated through the system.
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