[tor-bugs] #23863 [Core Tor/Tor]: When our directory guards don't have each others' microdescs, we should try an authority or fallback (was: 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 try
an authority or fallback
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 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):

 Some more detailed design questions, after reviewing #23817:
 * what should we do when we are using bridges, or all the authorities and
 fallbacks are excluded by an EntryNodes setting?
   * should we fetch mds from a fallback or an authority over a 3-hop path?
   * is this what bridge clients do already, or do they give up when they
 can't get something from their bridge(s)?
 * if we are willing to fetch missing microdescs over a 3-hop path, can we
 make should_set_md_dirserver_restriction() always return 1?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23863#comment:11>
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