BIND 10 #2227: re-add a temporary hotspot cache

[BIND 10 Development]

#2227: re-add a temporary hotspot cache
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            Reporter:  jreed         |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  medium        |                    Milestone:  New
           Component:  data source   |  Tasks
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  High
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 ChangeLog 455 (I think) removed the existing hot spot cache mechanism.

 Attached to this ticket is a graph showing a drop after when the default
 hotcache was removed.  I mark this ticket as a defect (versus a task or
 feature) due to this performance regression.

 It is useful in case of huge external databases that cannot be loaded into
 in-memory.

 vorner suggested: I think an query-answer cache (with rendered response
 packets) would make more sense.

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Ticket URL: <http://bind10.isc.org/ticket/2227>
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BIND 10 Development