HDFS Architecture Explained

Assertion A: HDFS follows a master-slave architecture with Name Node and Data Nodes.

This statement is correct. HDFS employs a master-slave design where the NameNode acts as the master server and the DataNodes act as slave servers.

Reason R: Name Node stores metadata, while Data Nodes store actual data blocks.

This statement is also correct. The NameNode is responsible for managing the filesystem namespace and controlling access to files. It stores metadata, such as file names, directory structure, permissions, and the mapping of files to their constituent data blocks. The DataNodes are responsible for storing and retrieving the actual data blocks, executing read/write requests from clients as directed by the NameNode.

Relationship between A and R:

Reason R provides the specific functional roles of the NameNode and DataNodes, which are the core components mentioned in Assertion A's description of the master-slave architecture. The way metadata is managed by the NameNode and data is stored by DataNodes defines the operation and structure of the HDFS master-slave system. Therefore, Reason R correctly explains Assertion A.

Conclusion:

Based on the analysis, both Assertion A and Reason R are correct, and Reason R provides the correct explanation for Assertion A.

The most appropriate answer is: Both A and R are correct and R is the correct explanation of A.