Output of query log

[m-kimoto at iij.ad.jp]

Hi unbound users

environment:
  unbound 1.8.1
  OS RHEL7.5

I want to output querylog immediately to a file different from other 
logs. It seems that it can not be set in unbound.conf.

I would like to know examples of solving the above.

Require the following performance.
・ 30000qps/host, cache hit rate 90%
I'm concerned about the loss the querylog at high load.

Any help is greatly appreciated.

Regards, Mamoru