[p2p-hackers] Re: scalability

[Bryan Turner]

	Ah, this is news to me :)  Thanks for the link.  I notice that this
partial file transfer feature is only a footnote on the main protocol..  How
wide spread is the partial file transfer feature among clients?

--Bryan
bryan.turner at pobox.com

-----Original Message-----
From: p2p-hackers-bounces at zgp.org [mailto:p2p-hackers-bounces at zgp.org] On
Behalf Of Daniel Stutzbach
Sent: Friday, December 02, 2005 3:22 PM
To: 'Peer-to-peer development.'
Subject: Re: [p2p-hackers] Re: scalability

On Fri, Dec 02, 2005 at 03:15:45PM -0500, Bryan Turner wrote:
> Gnutella (I believe) doesn't meet #2,3 and partially #4,5:
> 	#2 because it does not cluster related data it will eventually
> 		be overwhelmed with content.
> 	#3 because it performs full-file transfers instead of block
> 		exchanges or partial file transfers
> 	#4/5 because clients don't immediately offer partial downloads,
> 		thus hot spots have a congestion delay measured in
> 		full-file-transfer increments rather than in block
> 		increments (an order of 2 for typical MP3s, easily
> 		reaching multiple days of congestion).

If I am not mistaken, Gnutella has been doing partial file transfers for two
or three years now.  The eDonkey/eMule network does this too.

BitTorrent does not have a monopoly on this feature. :-)

The relevant spec (if it can be called a spec) for Gnutella is here:

http://www.the-gdf.org/wiki/index.php?title=Partial_File_Sharing_Protocol

-- 
Daniel Stutzbach                           Computer Science Ph.D Student
http://www.barsoom.org/~agthorr                     University of Oregon
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