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Type: Task
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Resolution: Fixed
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Priority: Major - P3
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Affects Version/s: None
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Component/s: Sharding
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Labels:
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Fully Compatible
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Sharding 2020-11-02
Add a new state to resharding coordinator state machines and state machines 'preparing-to-mirror'.
Context: Donors should enter this state upon seeing the coordinator enter 'mirroring', write the final oplog entry indicating that 'all writes must be run in distributed transactions', and then transition to 'mirroring' themselves after.