Impact of System Variables

In the linux system, the gfsnotify module uses the system’s inotify feature to implement file/directory watching. Therefore, this functionality is subject to the limitations of two kernel parameters:

• fs.inotify.max_user_instances: Indicates the number of inotify watching instances that the current user can create, which is the number of Watcher objects created by the gfsnotify.New method. Each Watcher object corresponds to an inotify instance in the system. The default system quantity is: 128.

• fs.inotify.max_user_watches: Indicates the size of the watched file queue that an inotify instance can add. If you add watched files to the same inotify beyond this limit, it will fail, and there will be system error logs. The default system quantity is usually: 8192 (some systems may have a larger value).

Viewing and Modifying

Take fs.inotify.max_user_instances as an example, in the linux system, you can view the current value of fs.inotify.max_user_instances with the following command:

cat /proc/sys/fs/inotify/max_user_instances

If you need to modify this value, you can use the following command (for example, to change the value to 1024):

sudo sysctl -w fs.inotify.max_user_instances=1024

To permanently modify this value, you can add the following content to the /etc/sysctl.conf file:

fs.inotify.max_user_instances=1024

Then execute the following command to make the changes take effect:

sudo sysctl -p