Every Mongo release announcement I hold out hope for an improvement to database-level write lock, and every time I'm disappointing. Considering this is probably

Every Mongo release announcement I hold out hope for an improvement to database-level write lock, and every time I'm disappointing. Considering this is probably the #1 or #2 complaint people have with Mongo, I'm surprised it hasn't been addressed ahead of some of the other features that have made it in to recent releases.