Cassandra Practice Test

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What is the purpose of Snitch in Cassandra?

To optimize data streaming
To determine/declare each node's rack and data center
To configure load balancing
To monitor node health

The correct answer is: To determine/declare each node's rack and data center

The purpose of a Snitch in Cassandra is to determine and declare each node's rack and data center. This information is crucial for the proper functioning of Cassandra's replication and partitioning strategy. By understanding the geographical and logical layout of the cluster, Cassandra can optimize data placement and improve read and write performance based on the location of the requests. Specifically, the Snitch enables the Cassandra cluster to be aware of the topology of both racks and data centers, allowing it to replicate data effectively across different physical locations. This awareness helps reduce latency by directing requests to nodes that are closer to the client and minimizes the risk of network partitioning impacting data availability. While optimizing data streaming, configuring load balancing, and monitoring node health are all important aspects of managing a Cassandra cluster, they rely on the foundational information provided by the Snitch. Therefore, the role of the Snitch is critical for efficient data distribution and helps ensure that the database operates optimally within its defined architecture.