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https://issues.apache.org/jira/browse/HDFS-9766?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15133685#comment-15133685
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Mingliang Liu commented on HDFS-9766:
-------------------------------------
There is a 0.1 seconds sleep, which is placed wrongly as discussed in
[HDFS-9139|https://issues.apache.org/jira/browse/HDFS-9139?focusedCommentId=15133596&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15133596].
Don't know if 0.1 seconds is good as this may still fail in a slow test machine.
> TestDataNodeMetrics#testDataNodeTimeSpend fails intermittently
> --------------------------------------------------------------
>
> Key: HDFS-9766
> URL: https://issues.apache.org/jira/browse/HDFS-9766
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: test
> Affects Versions: 3.0.0
> Reporter: Mingliang Liu
>
> *Stacktrace*
> {code}
> java.lang.AssertionError: null
> at org.junit.Assert.fail(Assert.java:86)
> at org.junit.Assert.assertTrue(Assert.java:41)
> at org.junit.Assert.assertTrue(Assert.java:52)
> at
> org.apache.hadoop.hdfs.server.datanode.TestDataNodeMetrics.testDataNodeTimeSpend(TestDataNodeMetrics.java:289)
> {code}
> See recent builds:
> *
> https://builds.apache.org/job/PreCommit-HDFS-Build/14393/testReport/org.apache.hadoop.hdfs.server.datanode/TestDataNodeMetrics/testDataNodeTimeSpend/
> *
> https://builds.apache.org/job/PreCommit-HDFS-Build/14317/artifact/patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs-jdk1.8.0_66.txt
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