When upgrading there can be problems due to workspace inconsistencies. You can either run a test upgrade to see if this will be an issue, or run the consistency checks as preventive action.
If you run a test upgrade that fails due to workspace inconsistencies you will see entries similar to the following in crx-quickstart/logs/crx/error.log:
*ERROR* TarPersistenceManager: No bundle found for uuid 'deadbeef-cafe-babe-cafe-babecafebabe' ... *ERROR* RepositoryImpl: Failed to initialize workspace 'crx.default' javax.jcr.RepositoryException: Error indexing workspace: Error indexing workspace: Error indexing workspace ...
To perform a consistency check, navigate to the administration page for the JMX Mbean com.adobe.granite (Repository). From the AEM main screen, go to:
Tools > Web Console > Main(on menu bar) > JMX > com.adobe.granite (Repository)
On a default installation, it is found here: |Show Me|
In the Operations section of the page you will find two methods: traversalCheck and consistencyCheck. To execute a check, click on the operation and enter the desired parameters.