[tor-bugs] #30733 [Core Tor/sbws]: sbws does not detect changes in descriptor bandwidth values

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#30733: sbws does not detect changes in descriptor bandwidth values
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 Reporter:  starlight              |          Owner:  juga
     Type:  defect                 |         Status:  needs_revision
 Priority:  Very High              |      Milestone:  sbws: 1.1.x-final
Component:  Core Tor/sbws          |        Version:  sbws: 1.1.0
 Severity:  Critical               |     Resolution:
 Keywords:  sbws-majority-blocker  |  Actual Points:
Parent ID:                         |         Points:
 Reviewer:                         |        Sponsor:
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Comment (by starlight):

 in longclaw data between 20190615-05 and 20190617-05 only 11% of relay
 descriptor tuples match exactly--dramatic improvement, the change appears
 to correct the issue

 -----

 my suggestion regarding sourcing descriptors from a relay tor instance
 rather than client-only instance was intended for longer term (unless the
 parameter change didn't work) -- the thought is dir-serve relay mode must
 always maintain a complete set of current descriptors and is less likely
 to regress than client modes; or sourcing from authorities has the
 advantage of obtaining descriptors with no propagation delay

 documentation on DirCache is confusing, seems to imply relation to dir-
 server readiness where it really relates to minimizing client memory
 utilization on very small hardware; what matters is FetchDirInfoEarly=1
 FetchUselessDescriptors=1 are in effect activated by relay mode operation

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30733#comment:27>
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