Effective Version and Software Version
Until you commit the upgrade, the effective version of the hosts in the cluster is the earlier version, not the newer version. The effective version is the version that the cluster as a whole is running. The software version is the version of MarkLogic Server that is installed on each host. You will be prompted to upgrade the Security database when you log in to the Admin Interface.
Note
After committing a rolling upgrade, you can only restore to the later version, not to the earlier version. Running your cluster in an uncommitted state is equivalent to running in the previous (earlier) version of MarkLogic.
An upgrade of the Security database is required after you have committed the new version of MarkLogic.