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https://issues.apache.org/jira/browse/MAPREDUCE-4980?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16117530#comment-16117530
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Allen Wittenauer commented on MAPREDUCE-4980:
---------------------------------------------

Hmm.  org.apache.hadoop.mapreduce.v2.TestMRJobs is apparently a problematic 
test.  I get the same failure in trunk (without this patch) on my Mac. :(  
Looking at the past few nightly ASF trunk builds, it passes. I'm guessing this 
test is making file system assumptions that aren't true? (On the Mac, it's 
likely because /tmp isn't actually a real directory.)

I wonder if it's worthwhile to get what we can in by dropping the changes to 
pom.xml, TestMRJobs, and TestUberAM.  Then we'd just need to work on fixing 
those two jobs without having to worry about losing the rest of the changes 
again.

> Parallel test execution of hadoop-mapreduce-client-core
> -------------------------------------------------------
>
>                 Key: MAPREDUCE-4980
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4980
>             Project: Hadoop Map/Reduce
>          Issue Type: Test
>          Components: test
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Tsuyoshi Ozawa
>            Assignee: Andrey Klochkov
>         Attachments: MAPREDUCE-4980.010.patch, MAPREDUCE-4980.1.patch, 
> MAPREDUCE-4980--n3.patch, MAPREDUCE-4980--n4.patch, MAPREDUCE-4980--n5.patch, 
> MAPREDUCE-4980--n6.patch, MAPREDUCE-4980--n7.patch, MAPREDUCE-4980--n7.patch, 
> MAPREDUCE-4980--n8.patch, MAPREDUCE-4980.patch
>
>
> The maven surefire plugin supports parallel testing feature. By using it, the 
> tests can be run more faster.



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