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Contents of /trunk/blog/posts/May-10-2008.mdwn

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Revision 139 - (show annotations)
Sat May 10 16:28:10 2008 UTC (7 years ago) by camrdale
File size: 3180 byte(s)
New blog post and tag for it.
1 [[meta title="apt-p2p 0.1.3: now faster"]]
3 I have updated [apt-p2p][10] to version 0.1.3, which is available now in
4 unstable and [my repository][20] (see my [[previous post|May-04-2008]]
5 introducing apt-p2p).
7 This update brings mostly speed improvements to finding peers to
8 download from, and performing the download. Nodes in the DHT are now
9 checked for responsiveness more thoroughly before adding them to the
10 routing table, and rechecked more frequently afterwards. This should
11 prevent bad nodes from propagating through the system, and departing
12 nodes remaining in the system long after they have left. Downloading
13 from peers is also quicker, as bad peers are dropped with a quicker
14 timeout value and after a small number of errors. [There was also a
15 bug][30] revealed by about 10% of the mirrors that caused downloads to
16 fail, and was fixed in version 0.1.2.
18 This update is STRONGLY recommended, as keeping unresponsive nodes out
19 of the DHT will make everyone's experience better. If you tried apt-p2p
20 and had some problems, I hope you'll consider trying again now.
21 Unfortunately, these are enhancements I could not predict needing before
22 releasing to the public, as the problems they solve are all caused by
23 having a larger number of users, some of which are unresponsive.
25 There are still a large number of peers (maybe 50% of them) that are
26 unreachable, and so can not share any files with other peers. I don't
27 have a good way to check yet, but you can go to sites such as [this
28 one][40] to probe your client for you. Just enter the remote IP address
29 and port (available on the [status page][50]) of your client in the form
30 `http://ipaddress:port/` (e.g. ``). If the check
31 returns any HTTP headers (even a 404 Not Found response) then you're
32 fine, but if it doesn't return anything then your peer is firewalled or
33 NATted and [should probably be fixed][60].
35 Here are the changelog entries for 0.1.2 and 0.1.3:
37 * Speed up downloading from peers
38 - Set a new peer's ranking values so they don't get an unfair
39 advantage.
40 - Reduce the HTTP connection timeout to 10s.
41 - Drop peers after a limited number of errors.
42 * Speed up the DHT requests when nodes fail
43 - Schedule a re-ping message after adding a new node.
44 - When a node fails, schedule a future ping to check again.
45 - Send periodic finds to nodes that are stale.
46 - Increase the stored value redundancy to 6.
47 - Increase the concurrency of DHT requests to 8.
48 - Add early termination and ignoring slow responses to
49 recursive DHT actions when timeouts occur.
50 * Remove the debconf note about port forwarding (Closes:[#479492][70])
51 - Add a NEWS entry for port forwarding
52 * Fixed a bug in the HTTP downloader that caused errors with some
53 mirrors that always close the connections (Closes: [#479455][30])
55 [10]: http://www.camrdale.org/apt-p2p.html
56 [20]: http://debian.camrdale.org/
57 [30]: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=479455
58 [40]: http://webtools.live2support.com/header.php
59 [50]: http://localhost:9977/
60 [60]: http://portforward.com/
61 [70]: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=479492
63 [[tag debian apt-p2p]]

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