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By acoin
via python.dzone.com
Submitted: May 13 2013 / 10:11

In recent work on PyMongo, I used a concurrency-control pattern that solves a variety of reader-writer problem without mutexes. I'm dubbing it the Wasp's Nest. Stick with me—by the end of this post you'll know a neat concurrency pattern, and have a good understanding of how PyMongo handles replica set failovers.
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