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a. Manage file system namespace

b. It is responsible for storing actual data

c. Perform read-write operation as per request for the clients

d. None of the above

1 Answer

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The correct answer is option A (Manage file system namespace).  NameNode acts as a master in Hadoop cluster and assign 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.

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Also, watch this video on HDFS for a better understanding:

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