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https://issues.apache.org/jira/browse/HADOOP-6276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12758121#action_12758121
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Nigel Daley commented on HADOOP-6276:
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Of course, HowToContribute wiki would need to be updated with this info as well.

> test-patch script should -1 patches that increase the number of 
> Thread.sleep() calls in tests
> ---------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-6276
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6276
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: test
>            Reporter: Nigel Daley
>            Assignee: Giridharan Kesavan
>
> Calls to Thread.sleep() in tests are likely dubious.  There are rare 
> occasions where these are required, but in general they lead to flaky unit 
> tests that fail sporadically.  We used to be much better at code reviewing 
> these out of patches, but have lost ground on that in the last few years (and 
> our flaky unit tests show that!). 
> I propose we have the test-patch script ensure that a patch does not add to 
> the number of Thread.sleep() calls in *tests* by giving a -1 to patches that 
> do increase it.  I suggest this is a simple grep for lines containing 
> "Thread.sleep(" and a "+" character in the first column.

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