BIND 10 #2135: design a new statistics model

[BIND 10 Development]

#2135: design a new statistics model
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            Reporter:  naokikambe    |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  medium        |                    Milestone:  New
           Component:  statistics    |  Tasks
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 As a result of the f2f meeting in Apr, we agreed that the stats daemon
 should pull statistics from each module. But in the current model, each
 module pushes to the stats daemon. So we need to design such a pull module
 before implementation.
 Current model:
 {{{
 +----+      +-----+
 |Auth| ---> |Stats|
 +----+ push +-----+
 }}}
 New model:
 {{{
 +----+ <--- +-----+
 |Auth| ---> |Stats|
 +----+ pull +-----+
 }}}
 If the new model is implemented into all modules, the existing push model
 would be unused and the codes might be dead codes. So we should replace
 the current model with the new model. After the implementation, we would
 remove such dead codes.

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Ticket URL: <http://bind10.isc.org/ticket/2135>
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BIND 10 Development