[tahoe-lafs-trac-stream] [tahoe-lafs] #1390: test whether it works to change encoding parameters for a new version of a mutable file

[tahoe-lafs]

#1390: test whether it works to change encoding parameters for a new version of a
mutable file
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     Reporter:  davidsarah     |      Owner:
         Type:  defect         |     Status:  new
     Priority:  major          |  Milestone:  soon
    Component:  code-encoding  |    Version:  1.8.2
   Resolution:                 |   Keywords:  test mutable
Launchpad Bug:                 |
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Comment (by Brian Warner <warner@…>):

 In [5216/trunk]:
 {{{
 #!CommitTicketReference repository="trunk" revision="5216"
 SDMF: update filenode with correct k/N after Retrieve. Fixes #1510.

 Without this, we get a regression when modifying a mutable file that was
 created with more shares (larger N) than our current tahoe.cfg . The
 modification attempt creates new versions of the (0,1,..,newN-1) shares,
 but
 leaves the old versions of the (newN,..,oldN-1) shares alone (and throws a
 assertion error in SDMFSlotWriteProxy.finish_publishing in the process).

 The mixed versions that result (some shares with e.g. N=10, some with
 N=20,
 such that both versions are recoverable) cause problems for the Publish
 code,
 even before MDMF landed. Might be related to refs #1390 and refs #1042.
 }}}

-- 
Ticket URL: <http://tahoe-lafs.org/trac/tahoe-lafs/ticket/1390#comment:2>
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