Cassandra Practice Test

What is emphasized when creating data models regarding consistency in Cassandra?

1. The importance of replication factors

2. Ensuring data consistency across different data centers

3. How to manage schema versioning

4. The speed of write operations

The correct answer is: Ensuring data consistency across different data centers

When creating data models in Cassandra, the emphasis on ensuring data consistency across different data centers is crucial due to the distributed nature of the system. Cassandra is designed to operate in a multi-data center environment, making it vital that data remains consistent across these centers to maintain integrity and reliability in applications that depend on accurate and up-to-date information. In Cassandra, data consistency is managed through a tunable consistency model, which allows you to determine how many replicas need to acknowledge a read or write operation before it is considered successful. This feature is particularly important for applications that span multiple data centers, as it ensures that data accessed from any location reflects the most current state. By prioritizing consistency in this way, developers can address latency and potential data discrepancies, resulting in a more robust and dependable data architecture. While aspects like replication factors, schema versioning, and write operation speed are important in their own contexts, they do not directly address the overarching concern of consistency that is emphasized in a multi-data center setup. Thus, the focus on consistency across different data centers is critical for achieving high availability and a coherent data state within a distributed Cassandra environment.