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https://issues.apache.org/jira/browse/HADOOP-13801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15644958#comment-15644958
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Steve Loughran commented on HADOOP-13801:
-----------------------------------------

and with more detail
{code}
testWithMiniCluster(org.apache.hadoop.fs.s3a.yarn.ITestS3AMiniYarnCluster)  
Time elapsed: 15.9 sec  <<< FAILURE!
java.lang.AssertionError: Not enough tokens in in string 
"first0910aline0930asecond0910athird0910a" from output 
"first0910aline0930asecond0910athird0910a"
        at org.junit.Assert.fail(Assert.java:88)
        at org.junit.Assert.assertTrue(Assert.java:41)
        at 
org.apache.hadoop.fs.s3a.yarn.ITestS3AMiniYarnCluster.getResultAsMap(ITestS3AMiniYarnCluster.java:120)
        at 
org.apache.hadoop.fs.s3a.yarn.ITestS3AMiniYarnCluster.testWithMiniCluster(ITestS3AMiniYarnCluster.java:103)
{code}
The test expects multiple lines coming back. It isn't getting them

> regression: ITestS3AMiniYarnCluster failing
> -------------------------------------------
>
>                 Key: HADOOP-13801
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13801
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 2.9.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>
> {{ITestS3AMiniYarnCluster}} is failing with an 
> {{ArrayIndexOutOfBoundsException}} splitting up the output of the wordcount 
> app. It's not getting word\t\count lines back.
> * git bisect points at commit 67e01f7;  HADOOP-13614. Purge some 
> superfluous/obsolete S3 FS tests that are slowing test runs down
> * problem exists when running standalone as well as in mvn parallel tests; 
> this implies it's not parallelisation



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