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https://issues.apache.org/jira/browse/MAPREDUCE-7013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16262899#comment-16262899
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Chris Douglas commented on MAPREDUCE-7013:
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MAPREDUCE-7011 is an example
> Tests of internal logic should not use the local FS as scratch space
> --------------------------------------------------------------------
>
> Key: MAPREDUCE-7013
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-7013
> Project: Hadoop Map/Reduce
> Issue Type: Test
> Reporter: Chris Douglas
>
> MapReduce often manipulates files/permissions to ensure splits, dependencies,
> and other user data are consistently managed. Unit tests of these internal
> methods sometimes set up temporary hierarchies in a scratch directory on the
> local FS to exercise these modules. However, dev environment quirks (e.g.,
> umask) can cause these tests to fail spuriously. Instead, this logic should
> be validated by mocking the filesystem.
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