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HDFS >> mail # user >> Multiple directories for dfs.name.dir

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Multiple directories for dfs.name.dir

I was just wondering why do we specify more than one directories for

What I understand is dfs.name.dir should be valued to 2 directories one on
the local and the other on the NFS.

 Are we trying to protect the name node from eventualities?  If so, what is
the role of Secondary NameNode ?

I am using apache hadoop-0.20