[BitTorrent] Re: bt2 protocol features

Bram Cohen bram at bitconjurer.org
Tue Jun 8 16:16:48 EDT 2004


dpmott at sep.com wrote:

> If you were to eliminate the "offset" and "length" fields when
> requesting a chunk, and make the chunksize appropriately small, then
> you could just request a chunk by offset.
>
> And, you can request a validation hash for each chunk.
>
> And, this approach would elminate that whole "chunk" and "piece"
> distinction...
>
> Is any of that wrong, or undesirable for some reason?

The piece/chunk distinction is done because if pieces are set to the size
of chunks the size of have bitfields becomes unreasonably large.

With hash trees, the chunks will probably be specified using plain old
offset, but there will still have to be a piece size set. and it will
still have to be consistent across all peers in the same torrent.

-Bram



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