[YARN-7721] TestContinuousScheduling fails sporadically with NPE

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.1.0
• Fix Version/s: 3.3.0
• Component/s: fairscheduler
• Labels: Reviewed
• Assignee: Wilfred Spiegelenburg
• Reporter: Jason Darrell Lowe
• Created: 09/Jan/18 15:38
• Updated: 26/Feb/20 05:29
• Resolved: 10/Dec/19 09:39

Description

TestContinuousScheduling#testFairSchedulerContinuousSchedulingInitTime is failing sporadically with an NPE in precommit builds, and I can usually reproduce it locally after a few tries:

[ERROR] testFairSchedulerContinuousSchedulingInitTime(org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.TestContinuousScheduling)  Time elapsed: 0.085 s  <<< ERROR!
java.lang.NullPointerException
	at org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.TestContinuousScheduling.testFairSchedulerContinuousSchedulingInitTime(TestContinuousScheduling.java:383)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
[...]