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https://issues.apache.org/jira/browse/HDFS-9911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15666178#comment-15666178
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Takanobu Asanuma commented on HDFS-9911:
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Hi, [~cnauroth]. I looked into this issue.
When building {{MiniDFSCluster}} in the {{setup()}}, the datanode infrequently
sends a lifeline. Then, {{lifelineNamenode}} is initialized, but
{{LifelinesNumOps}} of the datanode is already 1. I think this is the situation.
We can simulate it by calling {{DataNodeMetrics#addLifeline}} in the
{{setup()}}.
{code:java}
// Set up spies on RPC proxies so that we can inject failures.
DataNode dn = cluster.getDataNodes().get(0);
metrics = dn.getMetrics();
metrics.addLifeline(0);
{code}
> TestDataNodeLifeline Fails intermittently
> ------------------------------------------
>
> Key: HDFS-9911
> URL: https://issues.apache.org/jira/browse/HDFS-9911
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 2.8.0
> Reporter: Anu Engineer
> Assignee: Chris Nauroth
> Fix For: 2.8.0
>
>
> In HDFS-1312 branch, we have a failure for this test.
> {{org.apache.hadoop.hdfs.server.datanode.TestDataNodeLifeline.testNoLifelineSentIfHeartbeatsOnTime}}
> {noformat}
> Error Message
> Expect metrics to count no lifeline calls. expected:<0> but was:<1>
> Stacktrace
> java.lang.AssertionError: Expect metrics to count no lifeline calls.
> expected:<0> but was:<1>
> 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.apache.hadoop.hdfs.server.datanode.TestDataNodeLifeline.testNoLifelineSentIfHeartbeatsOnTime(TestDataNodeLifeline.java:256)
> {noformat}
> Details can be found here.
> https://builds.apache.org/job/PreCommit-HDFS-Build/14726/testReport/org.apache.hadoop.hdfs.server.datanode/TestDataNodeLifeline/testNoLifelineSentIfHeartbeatsOnTime/
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