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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Description changed by jinmei:

Old description:

> subtask of #2830.  no dependency.
>
> We'll extend the data source configuration so we can specify the type
> of cache (in memory) memory segment type and its parameter, if any.
> It would look like this:
>
> {{{
> "IN": [{
>     "type": "sqlite3",
>     "params": {"database_file":
> "/Users/jinmei/src/isc/git/bind10/zone.sqlite3"},
>     "cache-zones": ["jinmei.org", "kame.net"],
>     "cache-enable": true,
>     "cache-segment-type": "mmap",
>     "cache-segment-params": {
>       "mapped-file-base": "/usr/local/var/bind10/zone.mapped"
>     }
> }]
> }}}
>
> cache-segment-type has the default of "local".
> the default of cache-segment-params is empty.
>
> For now we only extend the spec.  It will be simply ignored if
> specified in the actual config.
>
> Note: mapped-file-base would have some reasonable default so the user
> can omit it.

New description:

 subtask of #2830.  no dependency.

 We'll extend the data source configuration so we can specify the type
 of cache (in memory) memory segment type and its parameter, if any.
 It would look like this:

 {{{
 "IN": [{
     "type": "sqlite3",
     "params": {"database_file":
 "/Users/jinmei/src/isc/git/bind10/zone.sqlite3"},
     "cache-zones": ["jinmei.org", "kame.net"],
     "cache-enable": true,
     "cache-segment-type": "mapped",
     "cache-segment-params": {
       "mapped-file-base": "/usr/local/var/bind10/zone.mapped"
     }
 }]
 }}}

 cache-segment-type has the default of "local".
 the default of cache-segment-params is empty.

 For now we only extend the spec.  It will be simply ignored if
 specified in the actual config.

 Note: mapped-file-base would have some reasonable default so the user
 can omit it.

--

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Ticket URL: <http://bind10.isc.org/ticket/2832#comment:3>
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