Which of the following is/are correct?Question 13Select one or more:Select one or more:a.The advantage of consistent hashing is that changes of a node only affects its immediate neighbors and other nodes remain unaffected.b.Dynamo uses consistent hashing to achieve consistency.c.In Dynamo, a virtual node looks like a single node, and thus each storage node must be responsible for exactly one virtual node.d.In consistent hashing, the output range of a hash function is treated as a “ring”.
Question
Which of the following is/are correct?Question 13Select one or more:Select one or more:a.The advantage of consistent hashing is that changes of a node only affects its immediate neighbors and other nodes remain unaffected.b.Dynamo uses consistent hashing to achieve consistency.c.In Dynamo, a virtual node looks like a single node, and thus each storage node must be responsible for exactly one virtual node.d.In consistent hashing, the output range of a hash function is treated as a “ring”.
Solution
a. Correct - Consistent hashing does indeed have the advantage that changes to a node only affect its immediate neighbors, leaving other nodes unaffected.
b. Incorrect - Dynamo uses consistent hashing, but it is used to distribute data across nodes, not to achieve consistency.
c. Incorrect - In Dynamo, each storage node can be responsible for more than one virtual node. This helps in balancing the load across the system.
d. Correct - In consistent hashing, the output range of a hash function is indeed treated as a "ring". This is done to facilitate the distribution of keys across nodes in a system.
Similar Questions
Dynamo is a NoSQL database developed by Amazon. Which of the following about Dynamo is/are correct?试题 8选择一项或多项：a.Dynamo is targeted mainly at applications where no updates are rejected due to concurrent writes.b.Dynamo uses the technique of consistent hashing to map each node to a single datacenter.c.Dynamo is designed to achieve strong consistency and high data availability simultaneously.d.Dynamo provides security related support for managing data, such as authentication and authorization.
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.
Which of the follwoing is not true about hashmap?a)It may have a single null key and multiple null values.b)It does not contain unique elements.c)HashMap contains value based on the key.d)It works on the principle of hashing.e)HashMap does not maintain order while iterating.
Which of the following is/are correct?Question 4Select one or more:Select one or more:a.Some NoSQL databases let the programmer decide the trade-off between scalability and consistency.b.Different NoSQL databases may offer different levels of transaction supports.c.There are no transactions in any NoSQL databases.d.NoSQL databases define isolation levels under the BASE model .
Which two options correctly describe how HMAC differs from hashing? (Choose two.
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.