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    Type:Bug 
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    Resolution: Done
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    Priority:Major - P3 
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    Affects Version/s: 2.12.0
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    Component/s: Connection Management
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See https://github.com/mongodb/mongo-java-driver/pull/184
Impact:
When running the 2.12.0 driver against a pre-2.6 server, a duplicate key error will cause the driver to empty the connection pool to the server it attempted to write to.