Cassandra Practice Test

What is Node Sync in Cassandra?

1. A method to sync data between replicas automatically

2. A process to perform full repair of data

3. A way to manage write operations

4. A strategy for data storage

The correct answer is: A method to sync data between replicas automatically

Node Sync in Cassandra refers to the method used to sync data between replicas automatically. In a distributed database like Cassandra, data is stored in multiple node replicas for redundancy and fault tolerance. As nodes may have different versions of data due to network latencies or system failures, Node Sync helps maintain consistency by ensuring that all replicas have the same data. This synchronization process occurs automatically in the background, allowing Cassandra to maintain availability and performance without manual intervention. It facilitates the replication factor settings configured for a cluster, meaning when data is written to one node, it is automatically synced to the appropriate number of replicas as defined by the replication strategy. This is crucial in a distributed setup, as it ensures resilience against data loss and enhances the overall robustness of the system. While the other options refer to significant operations and functionalities within Cassandra, they do not specifically address the automatic synchronization of data between nodes as accurately as the correct choice. Repair processes, write operations management, and data storage strategies are important, but they do not specifically encapsulate the definition and functionality of Node Sync.