[tor-bugs] #2183 [Tor Relay]: router_rebuild_descriptor(): Bug: Couldn't generate extra-info descriptor

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#2183: router_rebuild_descriptor(): Bug: Couldn't generate extra-info descriptor
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  Reporter:  Falo       |       Owner:  karsten            
      Type:  defect     |      Status:  closed             
  Priority:  normal     |   Milestone:  Tor: 0.2.2.x-final 
 Component:  Tor Relay  |     Version:  Tor: 0.2.2.17-alpha
Resolution:  fixed      |    Keywords:                     
    Parent:             |  
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Comment(by karsten):

 Replying to [comment:26 mikeperry]:
 > So what is the effect of removing things from the end of the smartlist?
 What types of elements can we expect to see removed if the size is over
 50KB?

 The current order in the smartlist is dirreq-stats, entry-stats, cell-
 stats, and then exit-stats. That means exit-stats will be removed first.
 This order is purely implementation-specific and not specified anywhere.
 This is a bug case and a fix to prevent relays from breaking. We shouldn't
 be in a situation where we want to write 50 KB of stats.

 > I also really needed to see the exit port byte totals. This is
 especially important to determining if we should weight certain exits
 differently than others based on exit policy. The only way we can tell how
 we should do this weighting is if we see these stats from very fast exits
 with the default exit policy, which are precisely the exits that are going
 to have very large extra info descriptors.

 You should be able to sum up all ports plus the 'other' port to learn
 about totals.

 > Why can't we just be smarter about grouping more of the long tail of
 ports with low bytes counts into other? This should reduce the size of the
 exit-kibibyes-* lines.

 We can do that. See the discussion in #2196 for ideas to reduce the exit-
 stats size.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/2183#comment:27>
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