Re: Resumable clone/Gittorrent (again)

[Nguyen Thai Ngoc Duy <pclouds@gmail.com>]

On Sun, Jan 9, 2011 at 12:21 AM, Luke Kenneth Casson Leighton
<luke.leighton@gmail.com> wrote:
>  ok - you haven't answered the question: are the chains perfectly
> fixed identical sizes?

No.

>  if so they can be slotted into the bittorrent protocol by simply
> pre-selecting the size to match.  with the downside that if there are
> a million such "chains" you now pretty much overwhelm the peers with
> the amount of processing, network traffic and memory requirements to
> maintain the "pieces" map.

No, there are thousands of them only (less than 100k for repos I
examined). It's precisely the reason I stay away from commits as
pieces because commits can potentially go up to millions.

>  if not then you now need to modify the bittorrent protocol to cope
> with variable-length block sizes: the protocol only allows for the
> last block to be of variable-length.

Ah I see. I do not reuse bittorrent code out there. Just its ideas,
adapted to git model. If you don't want to modify bittorrent protocol
at all, seed a bundle (as mentioned in another thread).
-- 
Duy