[YARN-6249] TestFairSchedulerPreemption fails inconsistently.

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.9.0
• Fix Version/s: 2.9.0, 3.0.0-alpha4
• Component/s: fairscheduler, resourcemanager
• Hadoop Flags: Reviewed
• Assignee: Tao Jie
• Reporter: Sean Po
• Created: 28/Feb/17 01:46
• Updated: 24/Apr/18 20:50
• Resolved: 19/May/17 22:29

Description

Tests in TestFairSchedulerPreemption.java will inconsistently fail on trunk. An example stack trace:

Tests run: 24, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 24.879 sec <<< FAILURE! - in org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.TestFairSchedulerPreemption
testPreemptionSelectNonAMContainer[MinSharePreemptionWithDRF](org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.TestFairSchedulerPreemption)  Time elapsed: 10.475 sec  <<< FAILURE!
java.lang.AssertionError: Incorrect number of containers on the greedy app expected:<4> but was:<8>
	at org.junit.Assert.fail(Assert.java:88)
	at org.junit.Assert.failNotEquals(Assert.java:743)
	at org.junit.Assert.assertEquals(Assert.java:118)
	at org.junit.Assert.assertEquals(Assert.java:555)
	at org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.TestFairSchedulerPreemption.verifyPreemption(TestFairSchedulerPreemption.java:288)
	at org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.TestFairSchedulerPreemption.testPreemptionSelectNonAMContainer(TestFairSchedulerPreemption.java:363)