MariaDB open_file limit can be increased ?

During past weeks I had several crashes in my server. When I contacted the support guys, they told me the open_files limit was exceeded for my MariaDB database server. Right now they have increased the open_files to 8000. Just for my confirmation I tested the open_files status,

Code: 
show global status like 'open_files';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| Open_files    | 2145  |
+---------------+-------+
1 row in set (0.00 sec)
I had currently 2145 open_files at the time of checking. At the same time when I query for processlist, It is only a couple of lines.

My questions are..
1. Is there any relation between processlist and openfiles?
2. Can higher number of open_file cause issue to server stability?
3. What is the reason for the open_file value to get increased?

Thanks in advacne.

 

 

 

 

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