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https://issues.apache.org/jira/browse/YARN-5853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15646641#comment-15646641
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Yussuf Shaikh commented on YARN-5853:
-------------------------------------
The null value shown in the error is the value of the tokenBuffer which is
obtained from the "SystemCredentialsForApps" map. The token value might not be
updated due to some delay.
> TestDelegationTokenRenewer#testRMRestartWithExpiredToken fails intermittently
> on Power
> --------------------------------------------------------------------------------------
>
> Key: YARN-5853
> URL: https://issues.apache.org/jira/browse/YARN-5853
> Project: Hadoop YARN
> Issue Type: Bug
> Affects Versions: 3.0.0-alpha1
> Environment: # uname -a
> Linux pts00452-vm10 3.10.0-327.el7.ppc64le #1 SMP Thu Oct 29 17:31:13 EDT
> 2015 ppc64le ppc64le ppc64le GNU/Linux
> # cat /etc/redhat-release
> Red Hat Enterprise Linux Server release 7.2 (Maipo)
> Reporter: Yussuf Shaikh
>
> The test testRMRestartWithExpiredToken fails intermittently with the
> following error:
> Stacktrace:
> java.lang.AssertionError: null
> at org.junit.Assert.fail(Assert.java:86)
> at org.junit.Assert.assertTrue(Assert.java:41)
> at org.junit.Assert.assertNotNull(Assert.java:621)
> at org.junit.Assert.assertNotNull(Assert.java:631)
> at
> org.apache.hadoop.yarn.server.resourcemanager.security.TestDelegationTokenRenewer.testRMRestartWithExpiredToken(TestDelegationTokenRenewer.java:1060)
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