BIND 10 #2832: extend data source config to specify shmem segment params

[BIND 10 Development]

#2832: extend data source config to specify shmem segment params
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  medium        |                    Milestone:  Next-
           Component:  Unclassified  |  Sprint-Proposed
            Keywords:                |                   Resolution:
           Sensitive:  0             |                 CVSS Scoring:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |  shared memory data source
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by jinmei):

 Replying to [comment:1 vorner]:
 > Should the directory be on per-zone basis?

 Assuming we are going to use a single mapped file for all zones, no.

 > Shouldn't that be better a global memmgr setting?

 Where to specify this information is actually something I'm not sure
 yet, but I'm also not sure what the "global" memmgr setting is.  Can
 you show an example?

 After thinking about this a bit closely, I'm currently feeling that it
 makes sense to simply specify a file (with postfix for versioning)
 just like the way we specify the sqlite3 DB file.  But as I said
 this is still a bit open.

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Ticket URL: <http://bind10.isc.org/ticket/2832#comment:2>
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