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https://issues.apache.org/jira/browse/HADOOP-5916?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12713317#action_12713317
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Konstantin Shvachko commented on HADOOP-5916:
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+1 setting "test.build.data" to build/test/data
Right now it is simply impossible to run some tests from eclipse because they 
try to write to "/tmp" or "." and this collides with the data already stored 
there. All unit test generated data should be under build so that it could be 
cleaned by the clean compile target.

> Standardize fall-back value of test.build.data for testing directories
> ----------------------------------------------------------------------
>
>                 Key: HADOOP-5916
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5916
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: test
>            Reporter: Jakob Homan
>         Attachments: test.build.data.txt
>
>
> Currently when the test.build.data property is not set, as happens when run 
> through some configurations of Eclipse, the fall-back value varies wildly.  
> Most calls set to /tmp, which is not good as it is beyond the scope of the 
> ant clean task and thus will not be deleted.  Others default to "." which can 
> drop the test files right in the current directory.  Speaking with Konstanin, 
> it seems the correct location should be "build/test/data" to ensure any files 
> that are created are within the scope of Ant's clean command.
> Attached is the current variation in this setting.

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