Could not increase number of max_open_files to more than 65536 (request: 1050635) (no replies)

Hi Sir,

I understand the warning message "Could not increase number of max_open_files to more than 65536 (request: 1050635)" is a common topic and solutions can be easily found in Google.
My question is how to know the 'request: 1050635' value from? Can I reduce the request value in order not to exceed the max_open_files value?

server: CentOS7
mariadb 10.1.20
galera-cluster 25.3.19

Thanks in advance!