Use of name node and Data node in Hadoop

Question

Explain the use of NameNode and Data Node in Hadoop

Answer 1

NameNode acts as a master in the Hadoop cluster and assigns the tasks to DataNode. It stores only metadata like Filename, Path, number of Datablocks, etc. but not the actual data. NameNodes are responsible for managing file system operations such as opening, closing, renaming files, and directories.

DataNode acts as a slave in the Hadoop Cluster whereas NameNode acts as a Master. DataNode stores the business data, creating, replicating, deleting, retrieving data blocks as per the instructions of Master (NameNode).

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