BIND 10 #2790: Lettuce tests timing & missed messages

[BIND 10 Development]

#2790: Lettuce tests timing & missed messages
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            Reporter:  vorner        |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  medium        |                    Milestone:
           Component:  Unclassified  |  Sprint-20130319
            Keywords:                |                   Resolution:
           Sensitive:  0             |                 CVSS Scoring:
         Sub-Project:  Core          |              Defect Severity:  N/A
Estimated Difficulty:  9             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by vorner):

 Hello

 Replying to [comment:10 jinmei]:
 > The blocking thread is running `ZonemgrRefresh`.  On receiving a
 > NOTIFY, this thread is eventually invoked and tries to send the
 > refresh command to xfrin:
 > {{{#!python
 >     def _send_command(self, module_name, command_name, params):
 >         """Send command between modules."""
 >         try:
 >             self._mccs.rpc_call(command_name, module_name,
 params=params)
 > }}}

 :-(. The threads there and use of the CC is such a mess (and yes, I admit,
 I probably caused this bug, by unifying the used mccs over the threads, it
 might have used separate connection to msgq before, but that felt wrong ‒
 why would one program connect to msgq multiple times?).

 I think there are two things that should be done:
  * Clarify if accessing CC from multiple threads is allowed, how it is
 allowed and if receiving a message should work after we enter the command
 main loop.
  * Get rid of threads in the zone manager. There does not seem to be need
 for them, except to cause bugs and brain damage (we don't really need
 performance in zone manager).

 But the question now is, both these probably will take some non-trivial
 time (though the first one could be reasonably short-time goal). Do we
 want to do some work around, like re-introducing separate CC session?

-- 
Ticket URL: <http://bind10.isc.org/ticket/2790#comment:11>
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