[tor-bugs] #25552 [Core Tor/Tor]: prop224: Onion service rev counters are useless and actually harmful for scalability

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#25552: prop224: Onion service rev counters are useless and actually harmful for
scalability
-----------------------------------------------+---------------------------
 Reporter:  asn                                |          Owner:  dgoulet
     Type:  defect                             |         Status:
                                               |  needs_revision
 Priority:  Medium                             |      Milestone:  Tor:
                                               |  0.3.4.x-final
Component:  Core Tor/Tor                       |        Version:  Tor:
                                               |  0.3.1.9
 Severity:  Normal                             |     Resolution:
 Keywords:  tor-hs prop224 034-roadmap-master  |  Actual Points:
Parent ID:                                     |         Points:  4
 Reviewer:  asn                                |        Sponsor:
-----------------------------------------------+---------------------------
Changes (by teor):

 * status:  needs_review => needs_revision


Comment:

 I'm going to suggest a different strategy:
 1. Make v3 onion services use the descriptor generation timestamp for the
 revision counter
 2. Backport this change to all tor versions with v3 onion services (0.3.2
 and later)

 This fix will make v3 onion services scaleable, by allowing multiple
 services to submit descriptors with a very small probability of revision
 number collisions. It also retains the property that newer descriptors
 replace older ones.

 We can make a separate decision about replay caches on HSDirs.
 We can make a separate decision about removing the revision counter
 entirely.
 If we decide to keep it, we should check that it's a 64-bit field, so it
 lasts past 2038.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25552#comment:18>
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