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- Schedule
- Program
- Application
- Namespace
- CDAP instance
For example, if a schedule has an associated principal, and the application also has an associated principal, the schedule-level setting will be used.
If there is no schedule-level, program-level, or app-level setting, but there is a namespace-level setting, then the namespace-level setting will be used.
In the previous example, if no namespace-level setting was defined, it would default to the configuration at the CDAP instance level. Pending - what happens if not even this is defined? Should this be required?
Implementation Design
User-launched programs
Hadoop's UserGroupInformation class has the following method:
// Log a user in from a keytab file.
UserGroupInformation loginUserFromKeytabAndReturnUGI(String user, String path);
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