Question 10: What is the meaning of coordinator node?
- Master node in Cassandra cluster.
- Node which contain master copy of any data.
- Client read or write requests can be sent to any node in the cluster, and when a client connects to a node with a request, that node serves as the coordinator for that particular client operation
- Node which contain configuration for entire cluster.
Correct Answer: 3
Explanation: Cassandra is a partitioned row store database, where rows are organized into tables with a required primary key. Cassandra's architecture allows any authorized user to connect to any node in any data center and access data using the CQL language. For ease of use, CQL uses a similar syntax to SQL and works with table data. Developers can access CQL through cqlsh, DevCenter, and via drivers for application languages. Typically, a cluster has one KeySpace per application composed of many different tables.
Client read or write requests can be sent to any node in the cluster. When a client connects to a node with a request, that node serves as the coordinator for that particular client operation. The coordinator acts as a proxy between the client application and the nodes that own the data being requested. The coordinator determines which nodes in the ring should get the request based on how the cluster is configured.