[tahoe-lafs-trac-stream] [tahoe-lafs] #1628: UCWE on deep check with recent version

[tahoe-lafs]

#1628: UCWE on deep check with recent version
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     Reporter:            |      Owner:  kevan
  davidsarah              |     Status:  assigned
         Type:  defect    |  Milestone:  undecided
     Priority:  major     |    Version:  1.9.0
    Component:  code      |   Keywords:  tahoe-check verify ucwe regression
   Resolution:            |
Launchpad Bug:            |
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Comment (by davidsarah):

 From the patch comments:
 {{{
 This tests for two regressions resulting from a design flaw in the 1.9
 mutable publisher; specifically, that the publisher doesn't keep track
 of more than one server for each share. This can lead to spurious UCWEs,
 as seen in ticket #1628. This also means that the publisher will no
 longer write shares associated with a new version of a mutable file over
 all of the existing shares that it can find, which potentially decreases
 the robustness of the new version of the mutable file.
 }}}

 This sounds to me like a regression serious enough to justify a 1.9.1.
 Although multiple servers holding the same share shouldn't happen if there
 have been only publish operations with a stable set of servers, it can
 easily happen if the grid membership is less stable and there have been
 repairs.

-- 
Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/1628#comment:14>
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