This is an upcoming (i.e. in progress) version of the manual.

Downgrade 4.4 to 4.2

MongoDB 4.4 Dev Series (4.3.x) Available

MongoDB 4.4 is currently in development as part of the 4.3 development series. While the 4.3-dev-series are available, these versions of MongoDB are for testing purposes only and not for production use.

The following page summarizes various considerations for downgrading to 4.2. For specific instructions for your deployment type, see:

Downgrade Path

Once upgraded to 4.4, if you need to downgrade, we recommend downgrading to the latest patch release of 4.2.

Create Backup

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 "4.2".

Remove Backwards Incompatible Features

Before downgrading the binaries, remove all persisted 4.4 features that are incompatible with 4.2.