[tor-bugs] #17907 [Tor]: Modify clients to consistently send N% of initial consensus requests to the authorities

Tor Bug Tracker & Wiki blackhole at torproject.org
Thu Jan 7 06:36:17 UTC 2016


#17907: Modify clients to consistently send N% of initial consensus requests to the
authorities
-------------------------+------------------------------------
 Reporter:  teor         |          Owner:
     Type:  enhancement  |         Status:  new
 Priority:  Medium       |      Milestone:  Tor: 0.2.8.x-final
Component:  Tor          |        Version:
 Severity:  Normal       |     Resolution:
 Keywords:  ipv6         |  Actual Points:
Parent ID:  #17908       |         Points:
  Sponsor:               |
-------------------------+------------------------------------

Comment (by teor):

 Currently, the authorities report serving about 2MB/s worth of
 consensuses, or about 1-2 consensuses per second.

 Once default fallbacks are release, we can calculate the proportion of
 client requests that we expect to go to each authority using
 DirAuthorityFallbackRate / (SUM(fallback.weight) + COUNT(authorities)).

 If all 413 fallback directories in [0] were accepted, this would be:
 1 / (6585231 + 9)  per authority, or 9 / 6585240 in total.

 The authorities would see about 3-4 consensus downloads per month under
 this new scheme, which means that we'd have to rely on relay statistics to
 count clients.

 Alternately, we could make this change and use it for stats.

 Is the change a good idea by itself?
 Does it get us anything?

 [0]:
 https://trac.torproject.org/projects/tor/attachment/ticket/15775/fallback_dirs.inc

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17907#comment:2>
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