[tor-bugs] #21642 [Core Tor/Tor]: Prop275: Eliminate "published" times from microdescriptor consensus

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#21642: Prop275: Eliminate "published" times from microdescriptor consensus
------------------------------------------------+--------------------------
 Reporter:  nickm                               |          Owner:  nickm
     Type:  enhancement                         |         Status:
                                                |  merge_ready
 Priority:  Medium                              |      Milestone:  Tor:
                                                |  0.3.1.x-final
Component:  Core Tor/Tor                        |        Version:
 Severity:  Normal                              |     Resolution:
 Keywords:  TorCoreTeam201703, review-group-17  |  Actual Points:  .5
Parent ID:                                      |         Points:  2
 Reviewer:                                      |        Sponsor:  Sponsor4
------------------------------------------------+--------------------------

Comment (by arma):

 Replying to [comment:23 nickm]:
 > That's 15/>9000 uploads, though?  It seems like it might not matter a
 great deal then.  I think we can also merge these patches now, and
 investigate how to fix the "version listed in consensus is quite old" bug
 before we actually change the published logic.  Agreed?

 Alas, disagree. I think those "not specified" uploads represent a bug
 where some relays upload when they don't need to (i.e. they didn't mark
 their descriptor dirty in any way before uploading), and where nearly all
 of those uploads are discarded because they have only cosmetic changes.

 Here's the stat after 12.5 hours:
 {{{
 $ grep "New descriptor post, because:" moria1-info|cut -d: -f5-|sort|uniq
 -c
    1324  bandwidth has changed
     279  config change
       3  configured managed proxies
     436  DirPort found reachable
       2  dns resolvers back
       2  IP address changed
    3434  not listed in consensus
  421560  not specified
    1120  ORPort found reachable
     674  rotated onion key
    4003  time for new descriptor
     868  version listed in consensus is quite old
 }}}

 And out of the "is quite old", we have
 {{{
 $ grep -A1 "is quite old" moria1-info|grep "Added descriptor"|cut -d\'
 -f2-|sort|uniq -c|wc -l
 426
 }}}

 So 426 of our ~7300 relays stayed in the consensus in the last 12.5 hours
 because of this hack.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21642#comment:24>
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