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https://issues.apache.org/jira/browse/HADOOP-13375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15386469#comment-15386469
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Stephen O'Donnell commented on HADOOP-13375:
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Those exceptions going to stderr are expected in that test, as it is testing
failed background refreshes. The Guava docs say that exceptions are 'logged and
swallowed'. I am hoping that when running outside of junit those logs would be
written to the namenode log file and not stderr.
> o.a.h.security.TestGroupsCaching.testBackgroundRefreshCounters seems flaky
> --------------------------------------------------------------------------
>
> Key: HADOOP-13375
> URL: https://issues.apache.org/jira/browse/HADOOP-13375
> Project: Hadoop Common
> Issue Type: Bug
> Components: security, test
> Affects Versions: 2.8.0
> Reporter: Mingliang Liu
>
> h5. Error Message
> bq. expected:<1> but was:<0>
> h5. Stacktrace
> {quote}
> java.lang.AssertionError: expected:<1> but was:<0>
> 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.junit.Assert.assertEquals(Assert.java:542)
> at
> org.apache.hadoop.security.TestGroupsCaching.testBackgroundRefreshCounters(TestGroupsCaching.java:638)
> {quote}
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