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What data is stored in a HDFS NameNode?

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NameNode is the central node of an HDFS system. It does not store any actual data on which MapReduce operations have to be done. But it has all the metadata about the data stored in HDFS DataNodes.

NameNode has the directory tree of all the files in HDFS filesystem. Using this meta data it manages all the data stored in different DataNodes.

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