about inverted index

[贺皓\(He Hao\)]

Hi Everyone,
  I'm a newer to hadoop. I want to write a mapreduce program to implement the 
inverted index. My question is which input format should I use? It seems that 
the TextInputFormat's key is the offset of each line in the document. How can I 
get the document name(as the document id) that the map function processes? 
   
  Thanks!
   
  He Hao

       
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