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    Fs image is snapshot of state of file system.when the namenode starts up it reads fs image file as its starting point & then applies any edits from log & then starts listenting to data node ( actually it is maintained in memory of namenode).
    Referred from google….



    The entire file system namespace,including the mapping of blocks to the files and file system properties,is stored in a file called the fs image.Mapping of blocks to the file is the part of fsimage.

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