[tahoe-lafs-trac-stream] [tahoe-lafs] #1392: Extended testing of server.get_latencies for the null backend case

[tahoe-lafs]

#1392: Extended testing of server.get_latencies for the null backend case
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 Reporter:  arch_o_median  |          Owner:
     Type:  defect         |         Status:  new
 Priority:  minor          |      Milestone:  undecided
Component:  code-storage   |        Version:  1.8.2
 Keywords:  review needed  |  Launchpad Bug:
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 This patch tests the behavior of get_latencies in two ways:
 One:
   The get_latencies method is covered.
 Two:
   In the case of a sample size of less than 1000 in a category
 get_latencies should return None as the value for each quantile in that
 category.
   If get_latencies simply reports the nth percentile ignoring small sample
 sizes the interpretation of identical values for 99th and 99.9th
 percentiles can become ambiguous.   That is one cannot tell if they have
 the same value because there are many latencies with the same value at the
 `big' end of the distribution, or if there are simply few observations and
 the value at the same index in the list is being reported twice.

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Ticket URL: <http://tahoe-lafs.org/trac/tahoe-lafs/ticket/1392>
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