Consistent Hashing for Distributed Caching Systems
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This exam was created by a large language model. Please use it with caution, as inaccuracies may be present. Always verify critical information.
1.
Describe the basic mechanism of the hash(key) % N approach for distributing data keys across 'N' cache nodes.
2.
Explain the major drawback of the hash(key) % N approach when a node is added to or removed from the cluster. What is this phenomenon commonly called?
3.
Which of the following best describes the 'hash ring' or 'hash circle' in consistent hashing?
4.
How are both data keys and cache nodes mapped onto the consistent hash ring?
5.
In consistent hashing, how is it determined which cache node stores a particular data key?
6.
Explain how adding a new node in consistent hashing minimizes the number of remapped keys compared to the hash(key) % N approach.
7.
What are 'virtual nodes' in consistent hashing, and what is their primary benefit?
8.
Which of the following are benefits of using consistent hashing in dynamic distributed caching environments? (Select all that apply)
of the total keys, rather than nearly all of them as in the modulo approach.\"},{\"id\":7,\"text\":\"What are 'virtual nodes' in consistent hashing, and what is their primary benefit?\",\"type\":\"short-answer\",\"correctAnswer\":\"Virtual nodes (also known as replicas or shards) are multiple representations of a single physical cache node on the hash ring. Instead of mapping one physical node to one point, a physical node is mapped to several points (virtual nodes) on the ring. Their primary benefit is to improve load distribution and mitigate 'hot spots'. By distributing the responsibilities of a single physical node across multiple points, virtual nodes ensure that when nodes are added or removed, the remapping of keys is more evenly distributed across the remaining nodes, preventing a single node from becoming overloaded and ensuring a more balanced key distribution.\"},{\"id\":8,\"text\":\"Which of the following are benefits of using consistent hashing in dynamic distributed caching environments? (Select all that apply)\",\"type\":\"multiple-choice\",\"options\":[\"Significantly increases the overall hash computation speed.\",\"Minimizes key remapping when nodes are added or removed.\",\"Eliminates the need for any form of load balancing.\",\"Improves system availability and fault tolerance.\",\"Reduces the impact of cache invalidation storms.\"],\"correctAnswer\":\"['Minimizes key remapping when nodes are added or removed.', 'Improves system availability and fault tolerance.', 'Reduces the impact of cache invalidation storms.']\"}]}],\"targetAudience\":\"Software Engineers \u0026 System Designers\",\"creationTime\":1759340418950,\"lastVisited\":1759340418950,\"model\":\"predefined\",\"timeTaken\":0,\"apiProvider\":\"static\"}},\"actionData\":null,\"errors\":null}");