I have a big file in the server and I want to copy it to the
10000( say large number of) clients. I don't want the server to send
the data individually to each and every client as it overloads the
server. Instead I want to use peer to peer kind of data transfer say
every machine is capable of sending and receiving data. Meanwhile that
big file is cut into small small chunks to do the transfer via many
threads across many peers.

sounds like you want a small bittorrent network running there
at your company :-)

read more about bit torrent on http://en.wikipedia.org/wiki/Bittorrent
and yes, it is a perfect way to transfere big files from
one source to many computers. but you need a tracker server
on one computer that the other computers can ask on wich computers
the file parts are on. since your file probably isn't public data
you can't just use http://thepiratebay.org/ though...


perhaps there are specialized applications that let you automaticly
distibute the files between all the computers until all have it,
managing so all computers not try to start download exactly the
same time etc...

good luck, an tell us what you found!