[tor-bugs] #23863 [Core Tor/Tor]: When our directory guards don't have each others' microdescs, we should mark some dead

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#23863: When our directory guards don't have each others' microdescs, we should
mark some dead
-----------------------------------------------+---------------------------
 Reporter:  teor                               |          Owner:  (none)
     Type:  defect                             |         Status:  new
 Priority:  Medium                             |      Milestone:  Tor:
                                               |  0.3.2.x-final
Component:  Core Tor/Tor                       |        Version:  Tor:
                                               |  0.3.0.6
 Severity:  Normal                             |     Resolution:
 Keywords:  tor-guard, tor-bridge, tor-client  |  Actual Points:
Parent ID:  #21969                             |         Points:  1
 Reviewer:                                     |        Sponsor:
-----------------------------------------------+---------------------------

Comment (by teor):

 Here's what we could do:
 1. Try some directory mirrors
 2. Try a fallback
 3. Try an authority
 4. If we still don't have mds for one or more primary guards, mark them
 dead until the next consensus

 This deals with the scenario where:
 1. Authorities make new consensus with new mds (hh:00)
 2. Client bootstraps and downloads consensus from authorities (either at
 random because they are part of the fallback list, or due to options)
 3. Client chooses directory guards
 4. Client tries directory guards for new mds
 5. Directory guards are waiting for a random time between hh:00 and hh:30
 to fetch new consensus and new mds
 https://gitweb.torproject.org/torspec.git/tree/dir-spec.txt#n3240

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23863#comment:1>
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