In HDFS file System,-------------NameNode is used when the Primary NameNode goes down.
A)rack
B)data
C)secondary
D)primary

Name: In HDFS file System,-------------NameNode is used when the Primary NameNode goes down. A)rack B)data C)secondary D)primary
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In HDFS (Hadoop Distributed File System), the Secondary NameNode is used as a backup to the Primary NameNode. It helps in taking snapshots of the file system metadata, but it does not serve as a failover option in the traditional sense.

In HDFS File System,-------------NameNode Is Used When the Primary NameNode