[bittorrent] Help or feature request

András Mocsáry amocsy at gmail.com
Mon Oct 4 05:18:19 EDT 2010

Hello, and thanks for all the answers.
Let me summarize, and see If I understood it all correctly:

We do have a project which involves whole file inserts more often than file
changes, but we do change each file sooner or later.

We can not really rename the files, since third party code finds them by
their name, and the whole point is to keep them up-to-date.

About chunks however, even if chunks would be part of multiple files (as I
understood Joseph Ashwood's comment), there would still be usefull chunks,
if we use the padding files technique mentioned by arvid at cs.umu.se. That
would make chunks 'fall not so naturally' since they would be 'aligned to a
piece boundary' (whatever that means).

András Mocsáry

ps: RSS and other seeds seem to be a good idea, I'll think about it some

2010/10/4 <arvid at cs.umu.se>

> If your files are likely to change in whole files at a time (as opposed to
> source code for instance, where you're likely to have inserts and deletes
> in the
> middle of the file), you might get it to work fairly well with bittorrent.
> If you append the version of a file to its filename, you could use an RSS
> feed
> with .torrents and make sure that they all are saved to the same directory.
> That
> way a new torrent with many identical files, would pick them up from the
> save
> directory. It's important of course to not have filename collisions for
> files
> that are different.
> If you want to have an efficient way of generating new torrent files, with
> mostly the same files, you could use pad-files (as introduced by BitComet,
> but
> it can be done a lot more elegant than that by adding extension flags).
> With
> padding files you make sure that all files are aligned to a piece boundary,
> and
> that you can re-use the hashes that you've already calculated for a file in
> your
> new torrent.
> Quoting Joseph Ashwood <ashwood at msn.com>:
> > --------------------------------------------------
> > From: "András Mocsáry" <amocsy at gmail.com>
> > Subject: [bittorrent] Help or feature request
> >
> > > I want to ask help, about wheter or not the thing I describe below is
> > > awailable, and if not, then pelase treat it as a proposal.
> >
> > I don't think the bittorrent structure is well designed for that
> particular
> > purpose, just the way the blocks will naturally fall (multiple files per
> > chunk, file ends spread across chunks, adding a CRLF in the first file
> means
> >
> > retransferring the entire fileset), the complexities of handling the
> > torrent, etc it really wouldn't make sense. The closest would be to use
> > with torrents, but that still has the the big problems.
> >
> > The other available p2p options I immediately thought of aren't much
> > immediate help either.
> >
> > That's not to say there isn't a solution, just that I can't think of a
> > disclosable p2p system that offers what you need easily.
> >                     Joe
> --
> Arvid Norberg
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