Cassandra Practice Test

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What is one effect of increasing the replication factor (RF) in Cassandra?

Reduces the range of token values
Creates inconsistencies in data
Causes overlap in token ranges among nodes
Decreases storage requirements

The correct answer is: Causes overlap in token ranges among nodes

Increasing the replication factor (RF) in Cassandra affects how data is stored and managed across the cluster. When RF is increased, it means that each piece of data will be stored on more nodes than before. This ensures greater data availability and durability because if one node fails, copies of the data will still exist on other nodes. The choice regarding overlap in token ranges among nodes is grounded in how Cassandra distributes data. Each node has a specific range of tokens it is responsible for. With a higher replication factor, the responsibility for the same data is distributed across multiple nodes. However, since the total token range does not change, nodes may store overlapping data portions, thereby allowing multiple nodes to have replicas of the same data. This redundancy is beneficial for failover and performance but indicates that some data is indeed found on more than one node, creating overlap in token ranges where these replicas are located. This aspect highlights the importance of replication in a distributed database like Cassandra and how it contributes to system resilience. Increasing RFID does not reduce token value ranges, create inconsistencies, or decrease storage requirements, which makes understanding this principle essential for effectively working with Cassandra clusters.