Copyright © 2019 MariaDB. All rights reserved.
This is in 10.2, albeit slightly different from Percona's . For transactional workloads should be on par or better. One of the features I that did not excite me in Percona's implementation is "low priority connection throttling", as this seems a little dangerous optimization with potential for deadlocks, so this is not there in MariaDB. I also think thread_pool_kickup_timer is more reliable mechanism to avoid stalling low priority threads as compared to Percona's "tickets".