Universal Agent should not eat inotify user_instances

Current Situation

A running Universal Agent with at least one remote file watcher eats inotify user_instances. The number increases until the maximum is reached. Then file watching does not work any more.

how to reproduce

• Shut down the Universal Agent.
• Count the number of used user_instances with sudo ls -l /proc/*/fd/* | grep notify | wc -l
• Start Universal Agent
• Count the number again. Should be unchanged
• configure a job chain with a file watching on the remote Universal Agent.
• Count the number again. The number now increases +1
• Wait (< one minute)
• Count the number again. The number now increases
• Shut down the Universal Agent.
• Count the number again. The number is now at the value from the beginning of the test.

Hint: The number of inotify user_instances can be increased with
sudo sysctl -w fs.inotify.max_user_instances=nnnn

Desired Behavior

A running Universal Agent with at least one remote file watcher should not eat inotify user_instances. The number of inotify user_instances should not be greater than the number of file order sources.

Workaround

• This problem is due to a missing directory configured for file watching. As a workaround users should check that directories configured for file watching exist.
• In this situation the Master log contains an error message that occurs approx. each minute. In addition an inotify handle is not closed in this situation.