Downgrade 4.4 to 4.2¶
The following page summarizes various considerations for downgrading to 4.2. For specific instructions for your deployment type, see:
- Downgrade 4.4 Standalone to 4.2.
- Downgrade 4.4 Replica Set to 4.2.
- Downgrade 4.4 Sharded Cluster to 4.2.
Once upgraded to 4.4, if you need to downgrade, we recommend downgrading to the latest patch release of 4.2.
If you need to downgrade form version 4.4, downgrade to 4.2.6 or a later version. You cannot downgrade to 4.2.5 or an earlier version.
Optional but Recommended. Create a backup of your database.
Downgrade Feature Compatibility Version (fCV)¶
Before downgrading the binaries, you must downgrade the
featureCompatibilityVersion (fCV) to
Remove Backwards Incompatible Features¶
Before downgrading the binaries, remove all persisted 4.4 features that are incompatible with 4.2.