View service configuration history
Ambari saves previous versions of configurations and provides access to them for comparision and revert.
From the Dashboard, click Config
Config History shows all versions across all services, with each version number and the date and time the version was created. You can also see which user authored the change, and any notes about the change. Use controls on Config History to filter, sort, and search across versions.
For a selected service, click Configs, then expand
Configs shows you details of the most recent configuration version by default. Use the version scrollbar to see previous config versions.
From the Version list, click any version in to view detailed information.
Click one of the following options:
Select Option To: Click a Version display detailed information for the selected version in Configs display and compare two versions apply configs from the currently selected version to the cluster