In the past time I was thinking the SecondaryNameNode is acting as a backup node for high availability of Hadoop.

Here are the Hadoop processes in my machine.

 $ jps
1698 SecondaryNameNode
1449 DataNode
4825 Jps
1295 NameNode

From reading the book I have known it's not that. The books says:

Here is the book's link:

Sams Teach Yourself Hadoop in 24 Hours

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