[bittorrent] Piece download strategy

Nikitas Liogkas neonile at gmail.com
Thu Apr 23 07:07:52 EDT 2009


I recall there have been some papers discussing this as part of a bigger 
system (usually having to do with video streaming), but I don't remember 
the titles off the top of my head. You can look for them at P2P 
conferences, such as IPTPS.

HTH
nikitas

Rayson Ho wrote:
> (I've read the FAQ, and watched Bram's talk online [1])
> 
> I know that the download strategy used by BT is usually rarest first.
> However, this means that there usually are many "holes" in a file when
> downloading.
> 
> It's not a problem if the torrent is well seeded. However if the
> availability of seeds is not stable, or if there is only 1 seed, then
> I think using the sequential order can give the user quite a lot of
> benefits -- if it is a music or movie file, then the user can at least
> view the beginning of it, and if it is a source tarball, then at least
> some part of the directory can be extracted...
> 
> Any one has worked on this before?? I am not replacing the rarest
> first strategy, but if the availability is same, then I want to bias
> towards sequential order (or even biggest consecutive piece first --
> try to construction a bigger piece).
> 
> Thanks,
> Rayson
> 
> [1]:
> http://www.stanford.edu/class/ee380/Abstracts/050216.html
> http://stanford-online.stanford.edu/courses/ee380/050216-ee380-100.asx
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