Upgrading a MongoDB replica set
When upgrading MongoDB from version 4.x to 7.x, there are important considerations related to data compatibility and the order of the upgrade.
A direct jump from version 4.x to 7.x is not possible because of changes in the data structure and functionality, which make older data incompatible with the newer MongoDB versions.
For a correct upgrade, we recommend the rolling update method. This process lets you upgrade MongoDB in stages. A rolling update keeps downtime to a minimum and reduces the risk of data loss or errors during the upgrade.
The move to MongoDB 7.x must be done in stages, through the intermediate version 5.x, which ensures the data compatibility is changed correctly.
This prevents potential problems caused by incompatibility between versions and provides a smooth transition to the current MongoDB version.
Step-by-step examples of migrating MongoDB 4.2 to MongoDB 7: