Hello,

That is a pretty wide question. What kind of depth are you seeking in an 
answer? Also, it has been asked before numerous times in different forms -- do 
try searching too! :)

To begin with, have you gone over the elementary articles such as the 
architecture guides and tutorials we carry at 
http://hadoop.apache.org/common/docs/current/, the still-relevant YDN Hadoop 
Tutorial that covers a range of things at 
http://developer.yahoo.com/hadoop/tutorial/ and some of the videos available at 
http://www.cloudera.com/resources/Training/ (there are loads out there, and a 
few sites also organize these).

After having done that, try checking out sources and read up from the API 
points of code that you've used often when writing FS clients or jobs. From 
there its just a never ending fall down the rabbit hole.

On 24-Nov-2011, at 10:28 PM, Hadoop Sai wrote:

> How the file will be divided into blocks and how the map reduce read those
> blocks of data .Can anyone can point out this piece of code.

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