[tor-bugs] #22355 [Core Tor/Tor]: Update dir-spec with client fallback directory mirror attempt and timeout behaviour

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#22355: Update dir-spec with client fallback directory mirror attempt and timeout
behaviour
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 Reporter:  teor          |          Owner:
     Type:  defect        |         Status:  new
 Priority:  Medium        |      Milestone:  Tor: 0.3.2.x-final
Component:  Core Tor/Tor  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:  torspec       |  Actual Points:
Parent ID:                |         Points:  0.5
 Reviewer:                |        Sponsor:
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Comment (by teor):

 Before we implemented exponential backoff (0.2.9.1-alpha, #15942) this was
 the behaviour:

 https://trac.torproject.org/projects/tor/ticket/4483#comment:43
 https://trac.torproject.org/projects/tor/ticket/4483#comment:47

 Then we implemented exponential backoff, and it didn't work well:

 https://trac.torproject.org/projects/tor/ticket/20499
 https://trac.torproject.org/projects/tor/ticket/20909#comment:4
 https://trac.torproject.org/projects/tor/ticket/20534#comment:8

 After #20499 and friends, the behaviour is:

 https://trac.torproject.org/projects/tor/ticket/20534#comment:19

 And we want to make it even less variable, so bootstrap times are more
 consistent:

 https://trac.torproject.org/projects/tor/ticket/20604
 https://trac.torproject.org/projects/tor/ticket/20605

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22355#comment:2>
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