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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: Replication
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Fully Compatible
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Repl 2021-01-25, Repl 2021-02-08
When starting a migration, recipient must write FCV version and whether it is fully upgraded or fully downgraded to recipient state document. When re-starting a migration due to failover, must check this state against current FCV and fail if there's a mismatch.
(saving whether it is fully upgraded or fully downgraded means we will not allow migrations across binary versions)