Michael Cronenworth wrote:
Matthew Woehlke wrote:
What about dropping hierarchical mirroring altogether? Why hasn't
someone developed a distributed (i.e. bittorrent-like) system for mass
mirroring? :-)
Already discussed[1][2] on the fedora-test-list.
[1] https://www.redhat.com/archives/fedora-test-list/2009-June/msg00032.html
[2] https://www.redhat.com/archives/fedora-test-list/2009-June/msg00062.html
It's too bad fedora-test-list doesn't seem to be on gmane (or isn't
named obviously; gmane.org is being too slow for me to ask about the
mail address).
In an idealized network (all servers have roughly the same speed links
to all other servers), BT distribution should get everything to everyone
in about 2x as long as to send everything to one server. In the worst
case, it should take 2x as long as to send everything over the slowest
link in the mesh, which if only care about when /all/ mirrors are fully
synced (a very reasonable assumption in this type of scenario) is still
pretty close to being an unconditional improvement. In practice, the
actual result will be somewhere between 2x the time to transfer over the
fastest link, and over the slowest link.
In a generalized sense, the time-order to distribute via bittorrent in
an idealized network is O(2 * K), where hierarchical systems are, at
best I believe O(log(base N) K) for the furthest mirrors, and still O(N0
* K) for the tier-0 mirrors. That's an improvement of an entire order
(O(log n) -> O(n)).
The point about there not being tools currently is what would need to be
addressed.
--
Matthew
Please do not quote my e-mail address unobfuscated in message bodies.
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