This ticket was split from DRIVERS-1918, please see that ticket for a detailed description.
- is duplicated by
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MOTOR-826 Server selection lacks guidance on using $readPreference global command argument for OP_MSG
- Closed
- is related to
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PYTHON-3021 Client sends incorrect read preference to standalones
- Closed
- related to
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PYTHON-2554 Support $merge and $out executing on secondaries
- Closed