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    Type:Task 
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    Resolution: Duplicate
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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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        Repl 2019-01-28
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Earlier versions of MongoDB will not be able to process the oplog entries that 'prepareTransaction' creates, so before upgrading or when downgrading we should not allow 'prepareTransaction'.
- duplicates
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                    SERVER-35881 Gate prepare on featureCompatibilityVersion 4.2 -         
- Closed
 
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- is related to
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                    SERVER-35881 Gate prepare on featureCompatibilityVersion 4.2 -         
- Closed
 
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                    SERVER-37287 Remove fcv guard around 'prepareTransaction' in MongoDB 4.4 -         
- Closed
 
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