ATOP, the Atomic Transactional Object Persistor, is a Python object database implemented atop the Berkeley DB and bsddb python module, with functional similarities to other python packages such as ZODB and COG. Atop was designed in support of the Quotient messaging server. The primary requirement was for a low-latency data store that was still reliable and transactional, and still amenable to on-the-fly upgrading and rapid code iterations. Atop is currently downloadable as part of the Quotient package.
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