I think map function gets the line number as key. You can ignore te other
lines after the key value 500.
Thanks
-Original Message-
From: Leiz [mailto:lzhan...@gmail.com]
Sent: Friday, June 26, 2009 8:57 AM
To: core-user@hadoop.apache.org
Subject: hwo to read a text file in Map function
The TextInputFormat gives byte offset in the file as key and the entire line
as value. so it won't work for you.
You can modify NLineInputFormat to achieve what you want. NLineInputformat
gives each mapper N Lines (in your case N=500)
Since you are interested in only first 500 lines of each
