BIND 10 #2568: bindctl systest is broken

[BIND 10 Development]

#2568: bindctl systest is broken
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            Reporter:  jinmei        |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  medium        |                    Milestone:  New
           Component:  Unclassified  |  Tasks
            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 jinmei):

 Replying to [comment:4 naokikambe]:

 > > > Furthermore on my environment, it passed even if I reverted the
 below commit. I don't know why it passed. Was that because zone loading
 wasn't blocked?
 > >
 > > Perhaps.  In any case I suspect it's a subtle timing issue and we
 > > should migrate to lettuce test.
 > After that it failed on my environment. But I inserted one-sec sleep as
 follow, I never failed.

 Adding a sleep is a well known workaround (btw I needed to insert
 multiple sleeps), but it has obvious drawbacks.

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Ticket URL: <http://bind10.isc.org/ticket/2568#comment:5>
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