Foreman » Smart Proxy

When using ISC lease file monitoring (nightly), the inotify event queue can overflow with many events if they're not processed quickly enough:

E, [2016-08-09T09:39:18.774323 #18572] ERROR -- : Error occured when monitoring /tmp/dhcp.leases
D, [2016-08-09T09:39:18.774363 #18572] DEBUG -- : inotify event queue has overflowed. (INotify::QueueOverflowError)
/home/dcleal/.rvm/gems/ruby-2.3.0@proxy/gems/rb-inotify-0.9.7/lib/rb-inotify/event.rb:120:in `initialize'
/home/dcleal/.rvm/gems/ruby-2.3.0@proxy/gems/rb-inotify-0.9.7/lib/rb-inotify/event.rb:100:in `new'
/home/dcleal/.rvm/gems/ruby-2.3.0@proxy/gems/rb-inotify-0.9.7/lib/rb-inotify/event.rb:100:in `consume'
/home/dcleal/.rvm/gems/ruby-2.3.0@proxy/gems/rb-inotify-0.9.7/lib/rb-inotify/notifier.rb:284:in `read_events'
/home/dcleal/.rvm/gems/ruby-2.3.0@proxy/gems/rb-inotify-0.9.7/lib/rb-inotify/notifier.rb:238:in `process'
/home/dcleal/.rvm/gems/ruby-2.3.0@proxy/gems/rb-inotify-0.9.7/lib/rb-inotify/notifier.rb:221:in `run'
/home/dcleal/code/foreman/smart-proxy/modules/dhcp_isc/inotify_leases_file_observer.rb:30:in `monitor_leases'
/home/dcleal/code/foreman/smart-proxy/modules/dhcp_isc/inotify_leases_file_observer.rb:37:in `block in start'

Mine's in a directory with lots of other noise (/tmp), but it seems possible to me that if re-parsing the file is slow then a limit could be hit.

The observer service should catch the exception and reinitialise the inotify tracking and re-parse the file.