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bugfix of connection full, see #322 and #346 .
Here is a brief of my modification:
liveSocketsmeans unused connections and used connections,unusedSocketsmeans unused connections. However, a connection won't be released even if it's an "unused" connection. So this comparison only restricts the used connections but not the total connections.So in my understanding, this comparison(
len(server.liveSockets)-len(server.unusedSockets) >= poolLimit) can only limit the total connections but not used connections. The right comparison should be:len(server.liveSockets) >= poolLimit && len(server.unusedSockets) == 0。This modification has already been merged and verified in my mgo branch which is used in MongoShake tools.