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https://issues.apache.org/jira/browse/YARN-7040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16130520#comment-16130520
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Eric Badger commented on YARN-7040:
-----------------------------------
Looks like a race condition in the test. The test sets a timer with an interval
of 1000ms and sleeps for 1500ms assuming that the timer will fire during that
time period. If the timer thread runs slowly then the node label won't get
updated by the time that it is checked in the test. The timer thread needs to
run pretty slowly (500 ms slower than the test code thread), but I've seen it
happen twice now.
> TestConfigurationNodeLabelsProvider.testConfigTimer
> ---------------------------------------------------
>
> Key: YARN-7040
> URL: https://issues.apache.org/jira/browse/YARN-7040
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Eric Badger
>
> {noformat}
> java.lang.AssertionError: expected:<[<X:exclusivity=true>]> but
> was:<[<A:exclusivity=true>]>
> 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:144)
> at
> org.apache.hadoop.yarn.nodelabels.NodeLabelTestBase.assertNLCollectionEquals(NodeLabelTestBase.java:117)
> at
> org.apache.hadoop.yarn.server.nodemanager.nodelabels.TestConfigurationNodeLabelsProvider.testConfigTimer(TestConfigurationNodeLabelsProvider.java:144)
> {noformat}
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