Logstash why periodically "falls off" dns?

Question

logstash

Tell me why logstash starts writing this to the log after some time

[2019-12-06T13:17:39,214][ERROR][logstash.filters.dns     ][main] DNS: Unexpected Error. {:field=>"dstname", :value=>"173.194.221.94", :message=>"Mutex relocking by same thread"}

Well, at the same time, it stops converting ip into a name. The problem persists both when using a remote dns server and when setting up a local caching one.

Answer 1

I need to update the plugins for logstash, I had a similar problem after updating them.

Answer 2

well, the resources are not infinite , the
local cacher is, of course, good,
but what's the point if he still has to turn to the external one for the answer?