[tor-bugs] #18689 [Tor]: Fallback Directory Selection should exclude down relays earlier

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#18689: Fallback Directory Selection should exclude down relays earlier
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     Reporter:  teor    |      Owner:
         Type:  defect  |     Status:  new
     Priority:  Medium  |  Milestone:  Tor: 0.2.???
    Component:  Tor     |    Version:  Tor: 0.2.8.1-alpha
     Severity:  Minor   |   Keywords:  easy python
Actual Points:          |  Parent ID:
       Points:          |   Reviewer:
      Sponsor:          |
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 The updateFallbackDirs.py script uses OnionOO to find a list of candidate
 directory mirrors, then checks the consensus download speed from each
 mirror.

 Previously, the script allowed relays that had a good uptime history, but
 just happened to be down right now.

 But this doesn't work any more, because those relays can't provide a
 consensus, so we exclude them in the final consensus download check.

 We could be smarter, and avoid the effort of that check by eliminating
 relays that aren't running right now from the list of fallback candidates.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18689>
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