+6114. [func] Run the catalog zone update process on the offload
+ threads. [GL #3881]
+
6113. [func] Add shutdown signaling for catalog zones. [GL !7571]
6112. [func] Add reference count tracing for dns_catz_zone_t and
failure when receiving multiple UDP messages in a single system call.
:gl:`#3840`
+- Run catalog zone updates on the specialized "offload" threads to reduce the
+ amount of time they block query processing on the main networking
+ threads. This should increase the responsiveness of :iscman:`named`
+ when catalog zone updates are being applied after a catalog zone has been
+ successfully transferred. :gl:`#3881`
+
Bug Fixes
~~~~~~~~~