CSHARP-2423 Fixed Connection Pools lock contention #361
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Locks changed to lock-free containers in order to get rid of lock contention in "threads heavy" environments. JIRA issue
The main problem in existing code that all releases (Dispose) of connections inside pools was made inside lock. It is possible to rewrite existing code and move Dispose outside of the lock, but lock-free containers are far more effective that current solution