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ZODB on LMDB #422

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@PythonLinks

FEATURE REQUEST

I am considering adding the Lightning Memory Mapped Database(LMDB) as a new storage for Persistent objects. Serialization would be done with MessagePack, that way it could be used from Python, Ruby, Julia and other languages. I hope it would get broader adoption than the ZODB file storage.

LMDB is a key-value store. It supports MVCC transactions, with multiple readers and one serialized writer. It is performant, and has a good reputation.

Compared to file storage, this would lose the append only log, it would lose the history, it would no longer require packing, but it would still require garbage collection for unreachable OIDs.

Comments would be most appreciated.

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