Cassandra Practice Test

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With a replication factor of two, how many nodes must respond successfully using consistency level quorum?

The correct answer is: 2

When using a replication factor of two in a Cassandra database, it indicates that each piece of data is duplicated on two different nodes. The consistency level "quorum" for a given replication factor is defined as the majority of the replicas. In this case, with a replication factor of two, the quorum would be calculated as the ceiling of (replication factor / 2) + 1. Given that the replication factor is two, the calculation would be as follows: - Replication factor = 2 - Majority = (2 / 2) + 1 = 1 + 1 = 2 This means that for a read or write operation to be successfully acknowledged with quorum consistency, both of the nodes (the two replicas of the data) must respond successfully. Therefore, a response from both nodes is required to ensure that the data is consistent across the replicas, leading to the conclusion that two nodes must respond successfully when the consistency level is set to quorum.