It is important to understand how service configurations are organized and stored in Ambari. Properties are grouped into configuration types. A set of config types composes the set of configurations for a service.

For example, the Hadoop Distributed File System (HDFS) service includes the hdfs-site, core-site, hdfs-log4j, hadoop-env, and hadoop-policy config types. If you browse to Services > HDFS > Configs, you can edit the configuration properties for these config types.

Ambari performs configuration versioning at the service level. Therefore, when you modify a configuration property in a service, Ambari creates a service config version. The following figure shows V1 and V2 of a service config version with a change to a property in Config Type A. After changing a property value in Config Type A in V1, V2 is created.