[tor-bugs] #13208 [Tor]: What's the average number of hsdir fetches before we get the hsdesc?

["Tor Bug Tracker & Wiki" <blackhole@xxxxxxxxxxxxxx>]

#13208: What's the average number of hsdir fetches before we get the hsdesc?
------------------------------+------------------------------
 Reporter:  arma              |          Owner:
     Type:  task              |         Status:  new
 Priority:  normal            |      Milestone:  Tor: 0.2.???
Component:  Tor               |        Version:
 Keywords:  SponsorR, tor-hs  |  Actual Points:
Parent ID:                    |         Points:
------------------------------+------------------------------
 Hidden services publish their hsdesc to six hsdir relays, once an hour.

 Then relays come and go, changing the set of six that clients will compute
 when deciding which relay to fetch from.

 Also, both hidden services and clients only fetch a new consensus every
 2-4 hours, so they will be perenially a few hours behind.

 This could pretty easily result in a situation where (due to different
 knowledge on the hidden service's part) the hidden service doesn't publish
 to all six that it's "supposed" to, and (due to different knowledge on the
 client's part) the client doesn't pick from the same six that the hidden
 service published to, and (due to churn in the relays) the six that the
 hidden service published to might not remain the right six from a global
 perspective.

 Realistically, do these skews matter?

 We could imagine doing an experiment where we follow the client algorithm
 and find out the average number of fetches we do before we get an answer
 (or give up).

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13208>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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