I tested our Magnolia 5.4.2 to Magnolia 5.4.4 upgrade, and found something unexpected.

In 5.4.4 you have the option to let Magnolia watch resources (which is the default):

magnolia.resources.classpath.observation.pattern=.*\\.(ftl|yaml)$

However this results in a high use of filedescriptors, around 4500 filedescriptors, which is quite a lot.

I tested the setting which watches 'nothing':

magnolia.resources.classpath.observation.pattern=.*\\.(nonel)$

Which gave a use of around 2000 filedescriptors.

If I want to watch css and js as well (which also live in the resources) like:

magnolia.resources.classpath.observation.pattern=.*\\.(yaml|ftl|css|js)$

Magnolia no longer runs properly and uses close to 10000 filedescriptors which is the default limit on an OSX system.

I can up the limit of course, but the numbers seem quite excessive.