Cassandra Practice Test

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What is the function of a virtual node (vnode) in Cassandra?

It allows nodes to operate without bootstrapping
It provides improved data redundancy
It balances token distribution and helps with node addition/removal
It reduces the size of partitions

The correct answer is: It balances token distribution and helps with node addition/removal

The function of a virtual node (vnode) in Cassandra primarily revolves around balancing token distribution and facilitating smoother node addition and removal. By dividing the token range of a Cassandra cluster into many smaller segments, vnodes enable a more efficient and uniform distribution of data across all nodes. When a new node is added to the cluster, or when an existing node is removed, vnodes allow for easier redistribution of data. Each node can own multiple vnodes, which means that when the token space is adjusted, the rebalancing process can be executed in smaller increments rather than moving large contiguous blocks of data. This makes the process faster and less disruptive to the overall system. Moreover, the use of vnodes enhances fault tolerance and load balancing, as data can be spread evenly across the available nodes, preventing any single node from becoming a bottleneck. This design choice significantly improves the scalability and maintainability of the Cassandra database, allowing for seamless operations as demands change.