how to get the filenames stored in dfs as the key

hi everybody. can anyone plase help me how to get the input filename in dfs as the key in the output? example: [ filenames , value] - Unlimited freedom, unlimited storage. Get it now

new to hadoop

hi everybody... we are M.E software engineering students using hadoop we need to use map reduce such that Basic Idea to do sequence alignment for the fasta files. We will give a fasta (a file format) file of an organism as query It has to be compared with the other i