RCs for Everyone (was One (more) week slip of Fedora 11 Release)

Andre Robatino andre at bwh.harvard.edu
Sun May 31 07:49:38 UTC 2009


cornel panceac wrote:

> otoh, it's exactly what torrent.fedoraproject.org 
> <http://torrent.fedoraproject.org> is doing.
> let's say for the sake of simplicity that the maximum number of clients 
> torrent.fedoraproject.org <http://torrent.fedoraproject.org> can get is 
> ten. once the eleventh client wants the bits, it will no longer get them 
> from the main site but instead from the other leechers. and yes, torrent 
> can get only the different bytes between rc2 and rc1, if you already 
> have rc1.

Bittorrent does let you save space, but it's not as efficient in this 
regard as either rsync or deltaisos.  Rsync (and bittorrent) also have 
the disadvantage that they let you start with a file which can be very 
different from the end file, which generates lots of bandwidth. 
Deltaisos starting with the Preview only work if you already have the 
Preview, which is both widely available on other mirrors and very close 
to the final file.  So putting only disos instead of full isos on the RC 
server ensures that each downloader pulls much less bandwidth from the 
RC server than at present.  Also, if there is more than one RC, 
additional disos could be provided from RC(n) to RC(n+1).  These should 
be much smaller than those from Preview to RC, which should already be 
about 1/15 the size of the full ISO.
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