[bittorrent] TCP question
torrent at blinkenlights.ch
Mon Jul 10 15:04:48 EDT 2006
> After peer B have finished downloading a piece from peer A , if peer B know
> peer A have some pieces which B don't have , B is still interested in A .But
> if these pieces are not rarest for B for a long time , so that B will
> select other peer to download its rarest piece ,during this time, do B still
> remain the TCP connection with A?
Well: If peer B is unchoked it would make sense for B to request pieces
from A even if they are not so-very-rare.
If, for some reason, peer B isn't willing to request pieces from A it
can choke itself.
I guess that most clients will close a connection with state
am_choking = 1 && peer_choking = 1
after a 'few' minutes. (My client does .. after about 30 min.)
> By the way, how can you make the conclusion ?
Which point do you mean exactly?
Your first question? (-> is the tcp-connection re-used for the next
Well: Startup some common BT client and run snoop/ethereal or
have a look at http://wiki.theory.org/BitTorrentSpecification (Queuing)
> from the BitTorrent spec
The BT-Specs are (sadly) non-existent :-(
http://wiki.theory.org/BitTorrentSpecification is so far the
best documentation known to me.
Someone should really write something like an RFC for BT...
The source of Mainline isn't an useable form of
spec/documentation... or would you read the source
of Sendmail or Bind if you needed to implement SMTP/DNS ?
More information about the BitTorrent