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https://issues.apache.org/jira/browse/HDFS-3530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13420345#comment-13420345
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Todd Lipcon commented on HDFS-3530:
-----------------------------------

I agree it's not a great _unit_ test case for the reason you mentioned, but 
deleting it without understanding why it fails sometimes doesn't seem right. It 
acts as a decent stress-test/functional test, and it's still worrisome that it 
fails.
                
> TestFileAppend2.testComplexAppend occasionally fails
> ----------------------------------------------------
>
>                 Key: HDFS-3530
>                 URL: https://issues.apache.org/jira/browse/HDFS-3530
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: test
>            Reporter: Eli Collins
>            Assignee: Tomohiko Kinebuchi
>         Attachments: HDFS-3530-for-debug.txt, HDFS-3530.txt, 
> PreCommit-HADOOP-Build #1116 test - testComplexAppend.html.gz
>
>
> TestFileAppend2.testComplexAppend occasionally fails with the following:
> junit.framework.AssertionFailedError: testComplexAppend Worker encountered 
> exceptions.
>       at junit.framework.Assert.fail(Assert.java:47)
>       at junit.framework.Assert.assertTrue(Assert.java:20)
>       at 
> org.apache.hadoop.hdfs.TestFileAppend2.testComplexAppend(TestFileAppend2.java:385)

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