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Author:
{'name': 'Suganthi Mani', 'email': 'suganthi.mani@mongodb.com', 'username': 'smani87'}
Message: SERVER-46379 upgrade/downgrade support for initial sync semantics.
Branch: master
https://github.com/mongodb/mongo/commit/d00b75bfcac3ac74036ac6c2ceec4e8b42ac93a0
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As described in the design:
- Config rewrites to include a ‘newlyAdded’ field will be gated on FCV 4.6.
- This will prevent different nodes in a mixed-version set from calculating vote totals and majorities differently.
- FCV downgrade will fail if ‘newlyAdded’ exists in the replica set config on any node, and will wait for that to be the case.
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Required work once FCV 4.4 gating has been added:
- Remove the feature flag added in
SERVER-46379 gating the newlyAdded field for members in ReplSetConfig
- Add FCV 4.4 gating for the newlyAdded field
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