BIND 10 #2421: don't reject configuring entire inmemory datasrc due to one broken zone

[BIND 10 Development]

#2421: don't reject configuring entire inmemory datasrc due to one broken zone
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            Reporter:  jinmei        |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  high          |                    Milestone:  Next-
           Component:  data source   |  Sprint-Proposed
           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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 We currently reject configuring a data source (with in-memory cache)
 if loading one particular zone fails.  That's probably not a good
 behavior, and is at least incompatible with BIND 9.  BIND 9 simply
 marks it as a bad zone and returns SERVFAIL to queries to that zone,
 still loading and serving any other valid zones.

 I think that's more reasonable behavior, and I believe it's not very
 difficult to implement it.  So I suggest we fix it now.

 It's also related to an issue reported by a user.

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Ticket URL: <http://bind10.isc.org/ticket/2421>
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BIND 10 Development