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As a beginner to hadoop I am confused with these words namespace and metadata. Is there any relation between these two ?

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According to 'Hadoop The definitive guide' - "The NameNode manages the filesystem namespace. It maintains the filesystem tree and the metadata for all the files and directories in the tree."

Essentially, Namespace means a container. In this context it means the file name grouping or hierarchy structure.

Metadata contains things like the owners of files, permission bits, block location, size etc.

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