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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6276) test-patch script should -1 patches that increase the number of Thread.sleep() calls in tests
Date Tue, 22 Sep 2009 17:18:16 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12758307#action_12758307
] 

Tsz Wo (Nicholas), SZE commented on HADOOP-6276:
------------------------------------------------

Then, how to write a unit test for simulating a slow writer?

> 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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