[tahoe-lafs-trac-stream] [tahoe-lafs] #1518: zero-byte MDMF reads should not fetch any segments

[tahoe-lafs]

#1518: zero-byte MDMF reads should not fetch any segments
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 Reporter:  warner                         |          Owner:
     Type:  defect                         |         Status:  new
 Priority:  minor                          |      Milestone:  eventually
Component:  code-mutable                   |        Version:  1.9.0a1
 Keywords:  mutable mdmf performance easy  |  Launchpad Bug:
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 A minor leftover from #1512 is a low-yield performance improvement: if
 somebody does a zero-byte read, the code should return without actually
 fetching any segments. The current code (as of [5235]) fetches the first
 segment, then throws away all of its data.

 This ought to be a two-liner: it's probably enough to return
 {{{defer.succeed(something)}}} without ever even talking to the
 {{{IConsumer}}}.

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Ticket URL: <http://tahoe-lafs.org/trac/tahoe-lafs/ticket/1518>
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