Defining Managed Metadata

To create custom properties in Cloudera Navigator:

1. Start and log into the Cloudera Navigator data management component UI with the credentials of a user having one of the following user roles:
   • Cloudera Manager Full Administrator
   • Cloudera Manager Navigator Administrator
   • Cloudera Navigator Full Administrator
   • Cloudera Navigator Metadata Administrator
2. Click the Administration link in the upper right. The Managed Metadata tab displays the list of namespaces and the properties defined in the namespaces.
3. Click the New Property... button.
4. In the Classes field, click or type the beginning of a Navigator entity classname.
5. Select the class of entities to which the property applies. To clear the field, hover over the field and click the that displays at the right of the field.
6. Click the Namespace field and select a namespace. If the Namespace drop-down list is empty, click Create Namespace....
   1. Specify a namespace name and optional description.
   2. Click Continue.
7. Add the name for the property.

   The name can contain letters, numbers, underscores, and hyphens and can be up to 50 characters long.

8. Specify an optional description.
9. Select the Multivalued Enable checkbox if the property can have more than one value. For example, an emailFrom property should accept only one value, but an emailTo property could accept more than one value.
10. In the Type drop-down list, select the property type and specify constraints on the value.
    • Boolean - Boolean: true or false.
    • Date - Date and time.
    • Enumeration - A set of values. In the Enumeration field, type valid enumeration values and press Enter or Tab.
    • Number - A number. In the Number Type field, select the type of the number: Integer, Long, Float, Double.
    • Text - A string.
      • Maximum Length - The maximum length of the string.
      • Regular Expression - A regular expression that determines whether a string is a valid value. You can test the expression by clicking Show regex tester, entering input that you expect to match the expression, and clicking Execute test. In the following example, the expression tester indicates that test@example.com matches the defined expression.
        
        
        
        
11. Click Continue to Review. The Review screen displays.
12. Click Create to create the property, Cancel to return to the Properties page, or Back to Edit Property to continue editing the property.

Example Properties

The following figure shows two properties in the namespace MailAnnotation that apply to entities of the HDFS Entity class (HDFS files and directories). The emailFrom property is of type TEXT and can be assigned a single value. The MailTo property is also of type TEXT but can have multiple values.

You can view managed metadata property summary details by clicking property name in the Properties table, or by clicking the Actions box in the property row and then clicking View in the dropdown.

You can also edit some aspects of a property, delete and restore a property, and purge a deleted property.

In addition to defining metadata using features provided by the Navigator Metadata UI, you can also define metadata using the Navigator API and Navigator SDK.

For information on the Navigator API, see Cloudera Navigator Data Management API.

For information on the SDK, see the Navigator SDK documentation.