Percona Server 5.7.15
Workloads with statements that take non-transactional locks (LOCK TABLES, global read lock, and similar) could have caused deadlocks when running under Thread Pool with high priority queue enabled andthread_pool_high_prio_mode set to transactions. Fixed by placing such statements into the high priority queue even with the above thread_pool_high_prio_mode setting. Bugs fixed #1619559 and #1374930.
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