[HDFS-9888] Allow reseting KerberosName in unit tests

• Type: Test
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 2.8.0, 2.7.4, 3.0.0-alpha1
• Hadoop Flags: Reviewed
• Assignee: Xiao Chen
• Reporter: Xiao Chen
• Created: 02/Mar/16 18:58
• Updated: 06/Jan/17 08:42
• Resolved: 04/Mar/16 17:50

Description

In some local environments, TestBalancer#testBalancerWithKeytabs may fail. Specifically, running itself passes, but running TestBalancer suite always fail. This is due to:

1. Kerberos setup is done at the test case setup
2. static variable KerberosName#defaultRealm is set when class initialization - before testBalancerWithKeytabs setup
3. local default realm is different than test case default realm

This is mostly an environment specific problem, but let's not make such assumption in the test.

Issue Links

• relates to: HDFS-9804 Allow long-running Balancer to login with keytab