> I reloaded a zone on a BIND 9.3.1 server using rndc and received a "zone
> reload queued" message. I don't think I'd ever seen that before. Why
> wasn't the zone reloaded immediately?

Because each zone transfers use a file descriptor. File
descriptors are a relatively scarce resource so only so
many of them are allowed to be in use at any one time.

Similarly the refresh queries (which preceed the zone transfer)
are rate limited to prevent the server being overloaded.

Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark_Andrews@isc.org