BIND 10 #2836: update in-memory zone loading so it can work with shmem segment

[BIND 10 Development]

#2836: update in-memory zone loading so it can work with shmem segment
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |  vorner
            Priority:  medium        |                       Status:
           Component:  data source   |  reviewing
            Keywords:                |                    Milestone:
           Sensitive:  0             |  Sprint-20130514
         Sub-Project:  DNS           |                   Resolution:
Estimated Difficulty:  4             |                 CVSS Scoring:
         Total Hours:  0             |              Defect Severity:  N/A
                                     |  Feature Depending on Ticket:
                                     |  shared memory data source
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by jinmei):

 Replying to [comment:5 vorner]:

 I forgot to answer this point:

 > > And also consider calling `MemorySegment::shrinkToFit()` in zone
 > > writer's cleanup() (for now `ZoneWriterLocal`, but I guess we'll
 > > cancel subclass the writer class; it would work independently from the
 > > memory segment type).  This will help minimize the extra memory space
 > > overhead after loading/replacing the zone.
 >
 > This is the second catch. [...]

 Ah, sorry, I forgot to update the description, but it's out of scope
 of this task.  It'll be handled in #2850, outside of the updater.

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Ticket URL: <http://bind10.isc.org/ticket/2836#comment:11>
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