BIND 10 #2179: Update Stats to support differential statistics updates

[BIND 10 Development]

#2179: Update Stats to support differential statistics updates
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                   Reporter:         |                 Owner:  naokikambe
  naokikambe                         |                Status:  reviewing
                       Type:         |             Milestone:
  enhancement                        |  Sprint-20120904
                   Priority:         |            Resolution:
  medium                             |             Sensitive:  0
                  Component:         |           Sub-Project:  DNS
  statistics                         |  Estimated Difficulty:  8
                   Keywords:         |           Total Hours:  0
            Defect Severity:  N/A    |
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Changes (by jelte):

 * owner:  jelte => naokikambe


Comment:

 First of all, i'd be clear and talk about 'partial' rather than
 'differential' data.

 Changelog:
 - see above (differential->partial)
 - and a few language improvements; i propose:
 The stats module now supports partial statistics updates. Each
 module can return only statistics data which have been updated since
 the last time it sent them to the stats module. The purpose of partial
 updates is to reduce the amount of statistics data sent through the
 message queue.


 And a side note: it's easier to propose a changelog ticket here (on trac)
 rather than through the branch, as it will most certainly cause an
 unnecessary conflict (just add it when you merge), and you'll need to
 update it to get the commit id anyway.

 But since it's there I have a comment, we use tabs instead of 8 spaces :)


 stats.py.in:

 in merge_oldnew(), I'd check whether the types are the same, and raise an
 error if they arent (i'm guessing you could have some pretty unexpected
 results if they are not, for some reason, as you then just drop the old).

 Also, I wonder if the lists version is useful; if they are of different
 length, can you be sure that the shorter list is the same as the start of
 the longer list?

-- 
Ticket URL: <http://bind10.isc.org/ticket/2179#comment:10>
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