[tor-bugs] #13699 [Tor]: Remove rend cache object if not usable anymore

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#13699: Remove rend cache object if not usable anymore
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     Reporter:  dgoulet  |      Owner:
         Type:  defect   |     Status:  new
     Priority:  normal   |  Milestone:
    Component:  Tor      |    Version:
   Resolution:           |   Keywords:
Actual Points:           |  Parent ID:
       Points:           |
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Comment (by dgoulet):

 Discussion on tor-assistant about this bug made by rransom, this might
 actually makes sense.

 > Why do you want HS clients to repeatedly pound on the same set of
 > intro-point relays if all of a hidden service's intro points are
 > (correctly marked as) unreachable?

 If it's indeed an acceptable behaviour to leave that object there until it
 expires which is right now 48 hours so we don't hammer unreachable intro
 points, that indeed makes sense.

 Now, I think a fat comment in the code is needed if it's the wanted
 behaviour here.

 The HS spec mentions that every 18 hours, a fresh descriptor is uploaded.
 This leaves 30 hours of difference between the cache obj and a new
 descriptor. Could we bring that down a bit? (well yeah there is a 24 hours
 clock skew adjustement so worst case that leaves us with a 6 hours
 difference).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13699#comment:2>
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