clients are hammering away on DNS irrespective, all this is saying is that (apparently) there are some 60k ip address that have been returned for (say) clients4.google.com and thats "too many"
I say apparently because when the bug for this first came up, I put it to R&D that this seems way out there, it is highly unlikely that "api.mixpanel.com" has access to this many IP addresses . I ran constant DNS queries for a few usual suspects for several hours from various geographies and summed up the unique ip addresses seen. Whist there are a lot, its orders of magnitude smaller than 32k or 64k.
To me, something is leaking. Let me get in touch with the R&D and see what I can find out.
** edit to my reply ** bug 114189 already exists for this, it's not fixed yet - QA was able to reproduce. Will try to hurry up R&D for an update/plan to resolve. In the mean time, you can consider disabling fw_vis - especially if the controller is starting to run low on memory (when you send tar logs techsupport I can check into that closer and advise)
regards
-jeff