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https://issues.apache.org/jira/browse/HADOOP-12706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15097376#comment-15097376
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Colin Patrick McCabe commented on HADOOP-12706:
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Sure, preserving the initial System.gc sounds good to me.  Feel free to post 
another version.

Yeah, this is definitely a test-only issue, not a bug in the code itself.  
Hopefully this solution will stabilize jenkins!  If we find JVMs where 
{{System.gc}} doesn't work, we might have to disable the test entirely, which 
would be too bad.

> TestLocalFsFCStatistics#testStatisticsThreadLocalDataCleanUp times out 
> occasionally
> -----------------------------------------------------------------------------------
>
>                 Key: HADOOP-12706
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12706
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: test
>            Reporter: Jason Lowe
>            Assignee: Sangjin Lee
>         Attachments: HADOOP-12706.002.patch, HADOOP-12706.01.patch, 
> HADOOP-12706.03.patch
>
>
> TestLocalFsFCStatistics has been failing sometimes, and when it fails it 
> appears to be from FCStatisticsBaseTest.testStatisticsThreadLocalDataCleanUp. 
>  The test is timing out when it fails.



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