Cassandra 面试题与答案
问题 16. What is the purpose of the nodetool utility in Cassandra?
Nodetool is a command-line utility in Cassandra that provides various administrative tasks, such as monitoring the cluster, managing compaction, and performing other maintenance operations.
问题 17. How does Cassandra handle read operations?
Cassandra uses a combination of partition key and clustering key to locate and retrieve data efficiently. Read operations can be served from memory (memtable) or disk (SSTables), depending on the specific scenario.
问题 18. What is the CQL (Cassandra Query Language)?
CQL is a query language for interacting with Cassandra databases. It is similar to SQL but is specifically designed for NoSQL databases and includes support for creating, updating, and querying data in Cassandra.
问题 19. Explain the difference between a wide row and a narrow row in Cassandra.
A wide row in Cassandra contains a large number of columns, while a narrow row has a smaller number of columns. The distinction is important for designing data models based on query requirements and performance considerations.
问题 20. What is the role of a coordinator node in Cassandra?
The coordinator node in Cassandra is responsible for receiving and coordinating client requests. It determines the nodes that need to be involved in the request and communicates with them to fulfill the operation.
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