MariaDB high CPU usage in OpenStack Pike

MariaDB High CPU usage in OpenStack Pike
Testing OpenStack Pike I realised MySQL daemon was utilizing 100% CPU resources without any specific reason, but I had never faced such problem before in previous OpenStack releases.

The situation heppened on few bare metal installations on pretty powerful servers. Restarting mariadb service was helpful just for the first few minutes after service restart, then the problem would happen again and again, what resulted in frequent Horizon Dashboard and Keystone inaccessibility and partial Controller unavailability.
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