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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 2018-02-26, Repl 2018-03-12, Repl 2018-03-26
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        None
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The new rollback implementation should preserve the existing behavior or writing rollback data to BSON files in the rollback/ folder under the dbPath directory:
https://docs.mongodb.com/manual/core/replica-set-rollbacks/#collect-rollback-data
- depends on
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                    SERVER-33847 Create aliases for BSONObj STL containers with simple binary comparison semantics -         
- Closed
 
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                    SERVER-33873 StorageInterface methods should be able to identify a collection via UUID -         
- Closed
 
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- is depended on by
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                    SERVER-21399 test that rollback files have valid data -         
- Backlog
 
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- related to
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                    SERVER-33525 Fix replication and sharding tests to work with RTT -         
- Closed
 
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                    SERVER-33663 Create setParameter to control creation of rollback data files -         
- Closed
 
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                    SERVER-21693 Log a rollback summary -         
- Closed
 
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