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From "Takanobu Asanuma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9911) TestDataNodeLifeline Fails intermittently
Date Tue, 15 Nov 2016 05:43:58 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15666178#comment-15666178
] 

Takanobu Asanuma commented on HDFS-9911:
----------------------------------------

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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