Defining Managed Metadata

1. Do one of the following:
   • Enter the URL of the Navigator UI in a browser: http://Navigator_Metadata_Server_host:port/, where Navigator_Metadata_Server_host is the name of the host on which you are running the Navigator Metadata Server role and port is the port configured for the role. The default port of the Navigator Metadata Server is 7187. To change the port, follow the instructions in Configuring the Navigator Metadata Server Port.
   • Do one of the following:
     • Select Clusters > Cloudera Management Service > Cloudera Navigator.
     • Navigate from the Navigator Metadata Server role:
       1. Do one of the following:
          • Select Clusters > Cloudera Management Service > Cloudera Management Service.
          • On the Home > Status tab, in Cloudera Management Service table, click the Cloudera Management Service link.
       2. Click the Instances tab.
       3. Click the Navigator Metadata Server role.
       4. Click the Cloudera Navigator link.
2. Log in to Cloudera Navigator 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
3. Click the Administration link in the upper right. The Managed Metadata tab displays the list of namespaces and the properties defined in the namespaces.
4. Click the Create... button.
5. In the Class field, click or type the beginning of a Navigator entity classname.
6. 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.
7. Click the Namespace field. If the Namespace drop-down list is empty, click Create Namespace....
   1. Specify a namespace name and optional description.
   2. Click Continue.
8. In the Namespaces drop-down list, select a namespace.
9. Specify an optional description.
10. Fill in the name of the property.

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

11. Select the Multivalued 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.
12. 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.
13. Click Continue to Review. The Review and Save screen displays.
14. Click Create to commit the change or Back to Edit Property to continue editing the property.

Example Properties

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

The only changes you can make to a custom property are to add classes to which the property applies and enumeration values.

1. Do one of the following:
   • Enter the URL of the Navigator UI in a browser: http://Navigator_Metadata_Server_host:port/, where Navigator_Metadata_Server_host is the name of the host on which you are running the Navigator Metadata Server role and port is the port configured for the role. The default port of the Navigator Metadata Server is 7187. To change the port, follow the instructions in Configuring the Navigator Metadata Server Port.
   • Do one of the following:
     • Select Clusters > Cloudera Management Service > Cloudera Navigator.
     • Navigate from the Navigator Metadata Server role:
       1. Do one of the following:
          • Select Clusters > Cloudera Management Service > Cloudera Management Service.
          • On the Home > Status tab, in Cloudera Management Service table, click the Cloudera Management Service link.
       2. Click the Instances tab.
       3. Click the Navigator Metadata Server role.
       4. Click the Cloudera Navigator link.
2. Log in to Cloudera Navigator 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
3. Click the Administration link in the upper right. The Managed Metadata tab displays the list of namespaces and the properties defined in the namespaces.
4. In the Properties table, click a property link. The Edit propertyname dialog box displays.
5. In the Additional Class field, click or type the beginning of a Navigator entity classname.
6. 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.
7. In the Additional Enumeration Values field, type valid enumeration values and press Enter or Tab.
8. Click Continue to Review. The Review and Save screen displays.
9. Click Update to commit the change or Back to Edit Property to continue editing the 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.