BIND 10 #2007: redesign in-memory data source structure

[BIND 10 Development]

#2007: redesign in-memory data source structure
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  medium        |                    Milestone:  Next-
           Component:  data source   |  Sprint-Proposed
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:  Data
         Total Hours:  0             |  source scaling
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 So we can substantially reduce memory footprint, and eventually
 extend it to a shared-memory version.

 In some sense it shouldn't be much different from the current data
 structure.  But we need to use some "serialized" representations
 instead of directly holding higher level libdns++ objects.

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Ticket URL: <http://bind10.isc.org/ticket/2007>
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