...
The first version of namespaces was introduced in CDAP v2.8.0, and is part of the HTTP RESTful API the Microservices v3.
Namespace Components
A namespace has a namespace identifier (the namespace 'name') and a description.
...
Once a namespace has been created, you can edit its description and configuration preferences, either by using a RESTful API or a Microservices or the Command Line Interface.
...
Namespaces can be deleted. When a namespace is deleted, all components (applications, datasets, MapReduce programs, Spark programs, metrics, etc.) are first deleted, and then the namespace itself is removed. To delete a namespace, see the Namespace HTTP RESTful APIMicroservices documentation. In the case of the default namespace, the name is retained, as the default namespace is always available in CDAP.
...