BIND 10 #2911: don't fallback from ixfr to axfr due to data source error

[BIND 10 Development]

#2911: don't fallback from ixfr to axfr due to data source error
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            Reporter:  jinmei        |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  medium        |                    Milestone:  Next-
           Component:  xfrin         |  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             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by vorner):

 What happens if the data source does not support differences? Doesn't it
 throw data source error too? In which case it would make sense to try with
 AXFR?

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Ticket URL: <http://bind10.isc.org/ticket/2911#comment:1>
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