BIND 10 trac2459, created. 38880a0a12721118c423dee2396ccfd165b103d0 [2459] do not throw when getZoneWriter result in "not cached".

[BIND 10 source code commits]

The branch, trac2459 has been created
        at  38880a0a12721118c423dee2396ccfd165b103d0 (commit)

- Log -----------------------------------------------------------------
commit 38880a0a12721118c423dee2396ccfd165b103d0
Author: JINMEI Tatuya <jinmei at isc.org>
Date:   Tue Nov 6 21:39:18 2012 -0800

    [2459] do not throw when getZoneWriter result in "not cached".
    
    instead, explicitly log the event at the debug level.  behavior-wise there's
    no difference, but the corresponding log message can be misleading.

commit aaf061f2c3f18d7e1cdc09c71ecb8820a107e64c
Author: JINMEI Tatuya <jinmei at isc.org>
Date:   Tue Nov 6 21:20:15 2012 -0800

    [2459] protect the call to getCachedZoneWriter() by mutex. it can cause race.

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