BIND 10 #2397: exception hierarchy within datasources

[BIND 10 Development]

#2397: exception hierarchy within datasources
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            Reporter:  jelte         |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  medium        |                    Milestone:  New
           Component:  Unclassified  |  Tasks
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 In #2210, we discovered we could use an exception hierarchy (or at the
 very least a clear distinction) within datasources, mainly to distinguish
 between configuration problems, setup problems (config ok but something is
 wrong, like bad connection or inconsistent data), and internal problems
 such as bugs. Right now most of it is generalized into the
 DataSourceError.

 This may also be related to zone loading.

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Ticket URL: <http://bind10.isc.org/ticket/2397>
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