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https://issues.apache.org/jira/browse/MAHOUT-1200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13647377#comment-13647377
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Dawid Weiss commented on MAHOUT-1200:
-------------------------------------
Another benefit is that if tests are run on a CI system such as jenkins,
failed/ interrupted builds don't add up and pollute the /tmp space. This also
has a drawback because another build wipes out any intermediate data but
Jenkins (and other such systems) can be set up to archive selected artefacts on
failed builds so I think this is minor).
> Mahout tests depend on writing to /tmp/hadoop-$user
> ---------------------------------------------------
>
> Key: MAHOUT-1200
> URL: https://issues.apache.org/jira/browse/MAHOUT-1200
> Project: Mahout
> Issue Type: Bug
> Components: build
> Affects Versions: 0.7
> Reporter: Isabel Drost-Fromm
> Attachments: MAHOUT-1200.patch
>
>
> Running the Mahout test suite creates the temp directory /tmp/hadoop-$user
> which is used by all Hadoop related tests that pull up a local cluster. The
> directory is not removed after running the tests. In particular when running
> multiple tests in parallel on the same machine as the same user this can lead
> to problems.
> To re-produce issue the following commands prior to running the full test
> suite:
> mkdir /tmp/hadoop-$USER
> chmod 000 /tmp/hadoop-$USER
> mvn test
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