Open cache resource and click "Refresh Now" button in caching tab
Verify cs_server.log file and you should be able to find the actual error which is causing the issue.
Issue/Introduction
Bulk cache upload is not working for Maria DB (Adapter: MySQL 5.5) as cache target data source even after enabling "Enable Native Loading"
Environment
TEST
Resolution
In this case, we have found the below error in the logs
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: The used command is not allowed with this MariaDB version
After researching the above error, we have found that its related 'local_infile' configuration. The 'local_infile' conf was set to 'OFF" and after changing it to 'ON', the cache refresh is working fine.
Please refer the below forum for more details about the solution: