[p2p-hackers] Error correcting codes to prevent failure in BitTorrent like systems?

[Arnaud Legout]

Hi,

Nick Johnson wrote:
>
> Excellent - this is exactly what I was looking for.
I happy to see it is useful to you
> However, I'm a little confused - first you say "Fig. 9 represents the 
> evolution of the number of copies of pieces in the peer set with 
> time", then you say "Fig. 12 represents the evolution of the number of 
> copies of pieces in the peer set with time. We see some major 
> differences compared to Fig. 9". What's the difference between what 
> you're graphing in the two graphs?
This is not the same torrent. Fig. 9 is for torrent 7 (see Table 1), and 
Fig. 12 is for torrent 11.
Torrent 9 is a typical torrent. We see that the number of copies in your 
peer set is well bounded.
Torrent 11 is a torrent with only one seed for most of the monitoring. 
In this case there are many pieces with only one copy (only on the seed
because the torrent is just starting),
but we see that even in this case the mean number of copies increases 
and that the rarest pieces are replicated fast.
This torrent shows that even with only one source, the pieces are 
efficiently replicated (Fig. 14 and Fig.15 leads to this conclusion).

Arnaud.