Perhaps you should read the whole article, then? As it happens, the article itself was exactly about how they actually made MongoDB work well even with the drea

Perhaps you should read the whole article, then? As it happens, the article itself was exactly about how they actually made MongoDB work well even with the dreary global lock because global locking for in-memory data is nearly nothing. They had no reason to get rid of the global lock, it works well enough. The author said he suspects that obtaining the lock actually takes more time than generally doing the actual database update; I don't know but it sounds about right.