What is NameNode?

NameNode is a daemon process in HDFS which is responsible for all processes related to storage in Hadoop. It Manages the Hadoop File system namespace. NameNode Itself doesnot store the actual data, whereas it stores the meta data in RAM for supporting faster operations. NameNode is a Single point of failure in Hadoop System.

Meta data files managed by NameNode are,

FSImage File.
EditLog File.

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BigData / Hadoop basics

What is NameNode?

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