To keep the same metadata and user data when upgrading, use the directory settings and database settings in the cluster properties file of your current version to form the basis of your new cluster properties file.
You should also ensure that your cluster properties file for HDP 2.3 is updated with all the relevent parameters. A sample cluster properties file is provided below, and for complete information on manually creating a cluster properties file see Defining Cluster Properties in Installing HDP on Windows.
