The nutch databases are either SequenceFile or MapFile formats which store key and value pairs. Their keys and values are Writable implementations which translate an object into it byte equivalent and vice versa.

Data and index files are MapFile format. Data is a SequenceFile, index is an index used by MapFiles for seeking to a specific key.

Please see the hadoop wiki for more information about Sequence and Map files and writable formats.

Dennis

oSilvio wrote:
Do somebody know how do the file structure works, briefly? It seems that the data are compressed or something, its not possible to
understand whats recorded in the data nor index files.
Thanks
Silvio

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