Hi @guyboertje. I have tested the path and this is what I see.
irb(main):001:0> Dir.glob('/var/lib/mesos/slave/slaves/*/frameworks/*/executors/*/runs/latest/tasks/*/stderr*')
=> []
irb(main):002:0> Dir.glob('/var/lib/mesos/slave/slaves/*/frameworks/*/executors/*/runs/latest/tasks/*/stdout*')
=> []
I have also tested:
irb(main):001:0> File.exists?('/var/lib/mesos/slave/slaves/*/frameworks/*/executors/*/runs/latest/tasks/*/stderr*')
=> false
irb(main):002:0> File.exists?('/var/lib/mesos/slave/slaves')
=> false
irb(main):003:0> File.exists?('/var/lib')
=> true
irb(main):004:0> File.exists?('/var/lib/mesos')
=> false
irb(main):005:0>
It could read the path /var/lib but not /var/lib/mesos. Both with root as the owner. Also I'm using Logstash 2.3.4, Elasticsearch and Kibana of version 5.5.1.