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Fencing of NameNode in Big Data Hadoop

There is only one Active Name Node at a time. So, fencing is a process to ensure this property in a cluster.

->The JournalNodes performs this fencing by allowing only one NameNode to be the writer at a time.
-> The Standby NameNode takes over the responsibility of writing to the JournalNodes and forbid any other          NameNode to remain active.
->  Finally, the new Active NameNode can perform its activities safely.  

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