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Finally, MongoDB 2.6 lays the foundation for massive improvements to concurrency in MongoDB 2.8, including document-level locking.

This is exciting even if I don't expect it to happen soon.

TokuMX, which I work on, has document level locking and compression right now.

trying amisaserver found it somewhere in the comments below. claims to have MVCC.

TokuMX does have MVCC

sweet then, will give tokumx a shot as well. Thanks