[YARN-1883] TestRMAdminService fails due to inconsistent entries in UserGroups

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.4.0, 3.0.0-alpha1
• Fix Version/s: 2.4.1
• Labels: java7
• Hadoop Flags: Reviewed
• Assignee: Mit Desai
• Reporter: Mit Desai
• Created: 26/Mar/14 22:39
• Updated: 12/May/16 18:29
• Resolved: 28/Mar/14 19:45

Description

testRefreshUserToGroupsMappingsWithFileSystemBasedConfigurationProvider fails with the following error:

java.lang.AssertionError: null
	at org.junit.Assert.fail(Assert.java:92)
	at org.junit.Assert.assertTrue(Assert.java:43)
	at org.junit.Assert.assertTrue(Assert.java:54)
	at org.apache.hadoop.yarn.server.resourcemanager.TestRMAdminService.testRefreshUserToGroupsMappingsWithFileSystemBasedConfigurationProvider(TestRMAdminService.java:421)
	at org.apache.hadoop.yarn.server.resourcemanager.TestRMAdminService.testOrder(TestRMAdminService.java:104)

Line Numbers will be inconsistent as I was testing to run it in a particular order. But the Line on which the failure occurs is

Assert.assertTrue(groupBefore.contains("test_group_A")
        && groupBefore.contains("test_group_B")
        && groupBefore.contains("test_group_C") && groupBefore.size() == 3);

testRMInitialsWithFileSystemBasedConfigurationProvider() and
testRefreshUserToGroupsMappingsWithFileSystemBasedConfigurationProvider()
calls the function MockUnixGroupsMapping.updateGroups(); which changes the list of userGroups.

testRefreshUserToGroupsMappingsWithFileSystemBasedConfigurationProvider() tries to verify the groups before changing it and fails if testRMInitialsWithFileSystemBasedConfigurationProvider() already ran and made the changes.