[tor-bugs] #17147 [Tor]: long-running client path-selection not seeing some (fast) exit nodes

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#17147: long-running client path-selection not seeing some (fast) exit nodes
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     Reporter:  starlight  |      Owner:
         Type:  defect     |     Status:  needs_information
     Priority:  normal     |  Milestone:  Tor: 0.2.???
    Component:  Tor        |    Version:  Tor: 0.2.6.10
   Resolution:             |   Keywords:
Actual Points:             |  Parent ID:
       Points:             |    Sponsor:
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Comment (by starlight):

 Not so simple this one.

 Today looked at a few more relays where the exit
 policy changed and every one worked fine in the
 long-running client--but BabylonNetwork00 remains
 completely unusable.

 Interestingly BabylonNetwork02 underwent the exact
 same exit policy change a few hours after BabylonNetwork00
 and is working as expected.

 A notable difference is that BabylonNetwork00 had
 a descriptor change the hour before the descriptor
 change where the new exit policy was delivered,
 where BabylonNetwork02 had no descriptor changes
 for a awhile before the policy change.

 BabylonNetwork00
 2015-10-09-11-10-09-server-descriptors -- old exit policy
 2015-10-09-12-10-23-server-descriptors -- new exit policy

 BabylonNetwork02
 2015-10-10-04-09-34-server-descriptors -- old exit policy
 2015-10-10-16-09-19-server-descriptors -- new exit policy

 Causes me to wonder if this problem is tied up with
 some difference between processing from
 `cached-descriptors` and `cached-descriptors.new`
 so I'll look for that going forward.

 If someone with a long-running client, especially
 one with `UseMicrodescriptors=0` in effect could
 try exiting through the above two nodes to
 see if the problem reproduces that would be
 helpful.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17147#comment:7>
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