[tor-bugs] #27247 [Core Tor/Tor]: Clients are using RAM for cached_dir_t

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#27247: Clients are using RAM for cached_dir_t
-------------------------------------------------+-------------------------
 Reporter:  nickm                                |          Owner:  nickm
     Type:  enhancement                          |         Status:
                                                 |  merge_ready
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.5.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  035-roadmap-master, 035-triaged-     |  Actual Points:
  in-20180711                                    |
Parent ID:  #27243                               |         Points:
 Reviewer:  teor                                 |        Sponsor:
                                                 |  Sponsor8
-------------------------------------------------+-------------------------
Changes (by teor):

 * status:  needs_review => merge_ready


Comment:

 The original fix was #20667, I think caching consensuses in RAM on clients
 was a mistake in that branch.

 I asked some questions on the pull request - in particular, I think this
 branch disables consensus diffs and if-modified-since headers on clients
 with `FetchUselessDescriptors 1`.

 Even so, I would happily merge this code as-is.

 (I will pull out my test bandwidth authority, and test master and this
 branch, but that's going to take a few days.)

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27247#comment:8>
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